200 Beast + Mikuni carb= Joy!

[MICRider]

Hi guys! Mikuni carb got delivered today... Bolted that sucker up and what a difference!! Out of the box it runs 100 times better than the stocker did! Messed with all the settings endlessly on the stocker and couldn't get it to stop flooding... Must have been the float setting or the needle. Mik works great though, no more flooding and no more stalling. Still have to fine tune it, but at least I have a good running starting point... Sooo nice not to have the stall/bog everytime I try to ride it :). Okay, I'm doing gushing, we will now return you to your regularly scheduled forums...

Regards,
Stew

[Weldangrind]

Awesome news! I'm getting ready to bolt on my Mikuni, and I'm looking forward to gains. The truth is that my stock carb runs pretty good, but I know there's more in there. 8)

[MICRider]

Makes a huge difference! Even the quality of the piece is apparent when comparing them side by side. I didn't bother with the handlebar choke cause I like the choke on the carb better. I think you would have to bolt the cable holder bracket from the stocker onto the Mik to use it anyway. I think for the price it is a worthwhile mod... Now, I just need one of them Uni filters! Hope you get good results with your carb switch :).

Regards,
Stew

[Weldangrind]

That's funny; I was hoping to report a measurable speed increase with the Mikuni, but the existing carb is good for 65 km/h (40 mph) and that's fast enough!

[TurboT]

That's funny; I was hoping to report a measurable speed increase with the Mikuni, but the existing carb is good for 65 km/h (40 mph) and that's fast enough!

:lol: You need flat ground not narrow paths with 1ft drops in them.

Another way to be quantitive with your upgrades is to modify yours, and then race me on mine. :) We seemed to be similar powerwise, other than your carb is better than mine, and I'm a bit heavier.

[MICRider]

Lol, never got a chance to wind mine up so I don't know if there is a difference in top speed, just happy the "throw me over the bars" bog is gone :). Idle seems a lot smoother now too, even though it still needs tweaked. They should put this carb on from factory.

Regards,
Stew

P.S. Now, if I can just get it to not handle like a drunken sailor on stilts...

[Weldangrind]

Better front shocks help a lot Stew.

I was thinking more about quantifying speed, and ther's no reason I couldn't go flat out in a lower gear. Let's say I determined that the quad as it sits will do 40 km/h in third; all I'd need to do is repeat the test after an upgrade.

Ok T, grab your helmet. We have testing to do. :D

[PCD]

Makes a huge difference! Even the quality of the piece is apparent when comparing them side by side. I didn't bother with the handlebar choke cause I like the choke on the carb better. I think you would have to bolt the cable holder bracket from the stocker onto the Mik to use it anyway. I think for the price it is a worthwhile mod... Now, I just need one of them Uni filters! Hope you get good results with your carb switch :).

Regards,
Stew

Stew, its cake. I did it with the Mikuni on the bike because I had read somewhere it "couldnt be hooked up" but then I started looking at it and it looked about the same. I bet it took less than 10 minutes, you can get a stubby phillips right in there.
That being said, if you like it the way it is, heck, leave it ;)

Both Weldangrinds and my Mikuni came with the needle on the lowest (richest) setting. With the exisiting 2 large holes in the air box, the carb made the bike run rich.

This took me a little time to figure out. After drilling another 8 holes (that FORCED me to adjust fuel screw) it runs way better and the plug is ALMOST tan...not quite, but almost. Problem is I'm at the stage where its so good i dont want to mess with it again until I get a proper filter.

Anyways, i think I ended up 1/14 turns out, but as we all know every one of these things is different. Our Mikunis have the screw at the "front" of the carb which makes it a fuel adjustment screw as opposed to having a screw at the back of the carb which would make it an air screw.

I have found some manuals that are close to our carb, but maybe they make so many different types the manuals are purposely generic.

It IS a neat upgrade though! :)

[PCD]

Better front shocks help a lot Stew.

I was thinking more about quantifying speed, and ther's no reason I couldn't go flat out in a lower gear. Let's say I determined that the quad as it sits will do 40 km/h in third; all I'd need to do is repeat the test after an upgrade.

Ok T, grab your helmet. We have testing to do. :D

That could hurt the bike if you have the no rev limiter CDI (and believe in it). Even without it, just winding the snot out of it one gear...why risk it?

What do you think of timing it instead? Maybe an 1/8 mile, or even just "from here to the stop sign" type of thing? Most every cell phone made these days has a stop watch function and you & Stew could work in tandem, one on the bike, one on the watch, thens vice-versa

Just a thought :)

[TurboT]

Better front shocks help a lot Stew.

I was thinking more about quantifying speed, and ther's no reason I couldn't go flat out in a lower gear. Let's say I determined that the quad as it sits will do 40 km/h in third; all I'd need to do is repeat the test after an upgrade.

Ok T, grab your helmet. We have testing to do. :D

Did you hit fourth gear in yours?? I think I only was in third on that stretch you hit 65/km. Even when I risked life and limb driving through that dark patch with the leaves I was only in third gear. Fourth seemed equal to suicide with those shocks on mine. :)

[TurboT]

I was thinking more about quantifying speed, and ther's no reason I couldn't go flat out in a lower gear. Let's say I determined that the quad as it sits will do 40 km/h in third; all I'd need to do is repeat the test after an upgrade.


Hey D,

Wouldn't staying in the same gear still top you at 40 km/hr? Does the gear not determine how fast it'll go regardless? ..or would the fact more HP per RPM push that level higher?

[Weldangrind]

Much better idea Pete. I'm glad I started spitballin' the plan; eventually a better one came to the surface. 8)

BTW, I'm not inclined to try a different CDI. I'm satisfied with the stocker and my other upgrades.

Anybody else try an NGK wire? The Crappy Tire part number is 026-2714-0, and it's cheap there. You get the entire wire with plug boot, and it will replace the stocker all the way back to the coil. IIRC, mine was a 1000 ohm improvement. BTW, it will fit on any single cylinder with a stud type plug, including dual sport bikes.

[PCD]

Anybody else try an NGK wire? The Crappy Tire part number is 026-2714-0, and it's cheap there. You get the entire wire with plug boot, and it will replace the stocker all the way back to the coil. IIRC, mine was a 1000 ohm improvement. BTW, it will fit on any single cylinder with a stud type plug, including dual sport bikes.

Ahhhh...i was wondering about this..I have an NGK with boot and bare coil end but the OD looks ( I say LOOKS) bigger than the boot that holds the stocker in the coil. The stocker is such a tight fit it almost looks molded on but i dont think it is, I could move it with my fingernail.

So..you got that (8mm?? maybe??) NGK in the stock coil boot? Just pull it out?

Any tips? i just havent got around to prying mine apart yet but would love to know what awaits when I do.

Oh, from my limited testing I expect this thing will do 50mph plus. I'm sure of it. No more comment until i have a GPS pic to prove it. :) :)

EDIT; Every computer i use has a trashed keyboard...sigh.

[TurboT]

That could hurt the bike if you have the no rev limiter CDI (and believe in it). Even without it, just winding the snot out of it one gear...why risk it?

What do you think of timing it instead? Maybe an 1/8 mile, or even just "from here to the stop sign" type of thing? Most every cell phone made these days has a stop watch function and you & Stew could work in tandem, one on the bike, one on the watch, thens vice-versa

Just a thought :)

I think time would be challenging. If you think about drag cars over a 1/4 mile, a second improvement takes some pretty good HP increases, if you reduce the length of the 'test strip', how much time improvement will you see? Then you need to factor in driver error. With no tachometer, tough to know if your shift points are similar etc..

I think the answer W&G is an accerormeter like we discussed. :) Cool toy and the high end ones would give you 1/8, 0-60 times etc.. Not exactly a cheap way to do it.

The 'fire road' at Nickelmine would be a good dragstrip if not for the nasty bumps.

It's making me wish I still had access to Pemberton and the runway!! ..but I digress.

Sorry for the damn post flood and hijacking this thread on carbs, I'm feeling wordy tonight.

[Weldangrind]

Whoa. 8O 50mph is too much for me on a Beast on a dirt road.

The coil wire simply unscrews from the coil. Peel back the boot where the wire meets the coil, and unscrew the wire. There is a stud inside the coil that the wire screws on to; no tools are needed. The 026-2714-0 fits great.

[PCD]

That could hurt the bike if you have the no rev limiter CDI (and believe in it). Even without it, just winding the snot out of it one gear...why risk it?

What do you think of timing it instead? Maybe an 1/8 mile, or even just "from here to the stop sign" type of thing? Most every cell phone made these days has a stop watch function and you & Stew could work in tandem, one on the bike, one on the watch, thens vice-versa

Just a thought :)

I think time would be challenging. If you think about drag cars over a 1/4 mile, a second improvement takes some pretty good HP increases, if you reduce the length of the 'test strip', how much time improvement will you see? Then you need to factor in driver error. With no tachometer, tough to know if your shift points are similar etc..

I think the answer W&G is an accerormeter like we discussed. :) Cool toy and the high end ones would give you 1/8, 0-60 times etc.. Not exactly a cheap way to do it.

The 'fire road' at Nickelmine would be a good dragstrip if not for the nasty bumps.

It's making me wish I still had access to Pemberton and the runway!! ..but I digress.

Sorry for the damn post flood and hijacking this thread on carbs, I'm feeling wordy tonight.

True, true...easy to get a car in the 12's...50X harder to see 10's...but realisticly this is all seat of the pants stuff unless we haul out a Lidar gun or something....was thinking of the easist way on the machinery ;)

[PCD]

Whoa. 8O 50mph is too much for me on a Beast on a dirt road.

I hit 4th and let it go for about 5 or 6 seconds til the pucker factor hit. I have no proof, but it seemed like 50 (or close) to me. It was buzzing pretty good. For now I'll just call it 45mph, but those front tires were getting AWFULLY tall looking ;)

The coil wire simply unscrews from the coil. Peel back the boot where the wire meets the coil, and unscrew the wire. There is a stud inside the coil that the wire screws on to; no tools are needed. The 026-2714-0 fits great.

Is your NGK wire fatter than the stocker I guess is what I'm asking?
Thanks for the stud info inside the coil!

[Weldangrind]

I just remembered: I once read an article about how surpisingly accurate the Hot Wheels radar guns are (yes, really). We could easily pick a starting point and a finish line and check for top speed at a specific point without reaching actual top speed of the quad. We could do several runs with a particular setup to establish a baseline for each combo.

I can't believe I just said all of that. I'm taking this waaay too seriously. :lol:

[TurboT]

I just remembered: I once read an article about how surpisingly accurate the Hot Wheels radar guns are (yes, really). We could easily pick a starting point and a finish line and check for top speed at a specific point without reaching actual top speed of the quad. We could do several runs with a particular setup to establish a baseline for each combo.

I can't believe I just said all of that. I'm taking this waaay too seriously. :lol:

Hey, I just thought of something. I think my GPS might be the answer.

It has a 'trip top speed' function, you can reset it manually.

You just zero it, do a run, stop and look at the information. It gives you like "moving time' , 'stopped time', 'top speed' etc and it's accurate. I did this on my YZ in Pemberton wondering how fast I was going. I even think it'll tell you how far you travelled, even without being on a road.

You can stick it in your pocket, do a pre determined run, record your times and speed... change your settings, reset the GPS, and do another run.

[PCD]

The Hot Wheels one is gonna be tough to live down bro......:)

[PCD]

I just remembered: I once read an article about how surpisingly accurate the Hot Wheels radar guns are (yes, really). We could easily pick a starting point and a finish line and check for top speed at a specific point without reaching actual top speed of the quad. We could do several runs with a particular setup to establish a baseline for each combo.

I can't believe I just said all of that. I'm taking this waaay too seriously. :lol:

Hey, I just thought of something. I think my GPS might be the answer.

It has a 'trip top speed' function, you can reset it manually.

You just zero it, do a run, stop and look at the information. It gives you like "moving time' , 'stopped time', 'top speed' etc and it's accurate. I did this on my YZ in Pemberton wondering how fast I was going. I even think it'll tell you how far you travelled, even without being on a road.

You can stick it in your pocket, do a pre determined run, record your times and speed... change your settings, reset the GPS, and do another run.

Anyone have a Blackberry? Even if you dont have a GPS app you can still use BB Maps for rudimentry functions.

Stew, your GPS device is much better suited to this than a Blackberry come to think of it. Garmin?

[TurboT]

The Hot Wheels one is gonna be tough to live down bro......:)

Hahaha!!!

I think my nephew has one of those.. not sure if it still works though.

[Weldangrind]

Now I gotta buy one...

http://cgi.ebay.ca/Hot-Wheels-Speed-Radar-Gun-used_W0QQitemZ270475995851QQcmdZViewItemQQptZLH_De faultDomain_0?hash=item3ef9a02acb

[PCD]

Now I gotta buy one...

http://cgi.ebay.ca/Hot-Wheels-Speed-Radar-Gun-used_W0QQitemZ270475995851QQcmdZViewItemQQptZLH_De faultDomain_0?hash=item3ef9a02acb

Use caution...nowhere in that listing do I see the the word "working" or "functional"...but then again, I'm cynical.

[TurboT]

Now I gotta buy one...

http://cgi.ebay.ca/Hot-Wheels-Speed-Radar-Gun-used_W0QQitemZ270475995851QQcmdZViewItemQQptZLH_De faultDomain_0?hash=item3ef9a02acb

Oh man I can hear it now.. We'll be in the trails and some guys on their jap quads will come by..

"aww man, look at those dweebs with their china quads AND a hot wheels radar gun! Looooooooserrrrs.." 8)

Gotta have a sense of humour.

[Weldangrind]

We better buy a couple of those Gio ball caps to complete the image. :lol:

[TurboT]

Anyone have a Blackberry? Even if you dont have a GPS app you can still use BB Maps for rudimentry functions.

Stew, your GPS device is much better suited to this than a Blackberry come to think of it. Garmin?

Hey Pete,

You're getting me confused with MICrider, who is Stew, and who started this thread we've so eloquently hijacked into a speed testing discussion. :) It got a little hectic so easy to do! I try to keep my real name out of the public forums, (for reasons I still don't know just do :)) but if you check our PM you'll jog your memory! :)

I do have a Blackberry with the GPS ap, but where W&G ride there is no cell coverage, and when I tried to load it there it flashed at me that it wouldn't work without it... it struck me as odd at the time, since GPS should be seperate from cell coverage.. I'm thinking perhaps it locates the maps via the cell network as to not store them in the phones memory, and just shuts itself down without the coverage.

My GPS is a Garmin yes, and it probably does way more than I use it for.. but I know it has the functions I mentioned before and is quite accurate.

[TurboT]

We better buy a couple of those Gio ball caps to complete the image. :lol:

Geeze chap I just about pissed myself laughing at that comment. :lol: :lol:

[PCD]

We better buy a couple of those Gio ball caps to complete the image. :lol:

OK, we're even for the Hot Wheels thing now....I know you saw that in a pic so dont play all innocent with me ;)

EDIT: TurboT, yes, I got confused, sorry about that. Some of the carriers apps "cheat" and use cell towers for location. Other ones use the real deal and search for birds.

[TurboT]

We better buy a couple of those Gio ball caps to complete the image. :lol:

OK, we're even for the Hot Wheels thing now....I know you saw that in a pic so dont play all innocent with me ;)

EDIT: TurboT, yes, I got confused, sorry about that. Some of the carriers apps "cheat" and use cell towers for location. Other ones use the real deal and search for birds.

PCD chap, if you ever get out to BC all three of us need to have some pops and a laugh. :)

After I thought about the cell/gps thing it made sense to me, so you can chalk Telus up as a cheater on the GPS ap. Or perhaps its Blackberry itself who's cheating with their programming.

[Weldangrind]

OK, we're even for the Hot Wheels thing now....I know you saw that in a pic so dont play all innocent with me ;)

How about modelling it for us? :D

http://i644.photobucket.com/albums/uu164/petecd/Tires.jpg

[Weldangrind]

Pete, all kidding aside, I forgot that you bought that NGK wire. Does it look to be the genuine article to you?

[PCD]

OK, we're even for the Hot Wheels thing now....I know you saw that in a pic so dont play all innocent with me ;)

How about modelling it for us? :D

http://i644.photobucket.com/albums/uu164/petecd/Tires.jpg

Ah....rubbing the salt in are we? ;)

[Weldangrind]

Ah....rubbing the salt in are we? ;)

First round is on me if we ever meet, Pete. :D

[PCD]

We better buy a couple of those Gio ball caps to complete the image. :lol:

OK, we're even for the Hot Wheels thing now....I know you saw that in a pic so dont play all innocent with me ;)

EDIT: TurboT, yes, I got confused, sorry about that. Some of the carriers apps "cheat" and use cell towers for location. Other ones use the real deal and search for birds.

PCD chap, if you ever get out to BC all three of us need to have some pops and a laugh. :)

After I thought about the cell/gps thing it made sense to me, so you can chalk Telus up as a cheater on the GPS ap. Or perhaps its Blackberry itself who's cheating with their programming.

Sounds like a plan if I can swing it one summer. Best thing is I can buy a bike, have it delivered to one of you, run it for a few days, then sell it half price. What colours you like? :)

W&G: Yes, it is a real NGK as far as I can tell, with Chinese labels all over it. Package looks same as C/T, wire looks identical...probably has bailing wire for a core knowing my luck.

[PCD]

Ah....rubbing the salt in are we? ;)

First round is on me if we ever meet, Pete. :D

Nah, we take a cab, throw a 50 each on the table, take a cab back when its gone....but thanks!!

[TurboT]

Ah....rubbing the salt in are we? ;)

First round is on me if we ever meet, Pete. :D

Nah, we take a cab, throw a 50 each on the table, take a cab back when its gone....but thanks!!

Holy.. what color is a $50 again? It's been so long.. :)

... that sounds like a fun night, and an awful morning, but who cares? :)

[PCD]

Ah....rubbing the salt in are we? ;)

First round is on me if we ever meet, Pete. :D

Nah, we take a cab, throw a 50 each on the table, take a cab back when its gone....but thanks!!

Holy.. what color is a $50 again? It's been so long.. :)

... that sounds like a fun night, and an awful morning, but who cares? :)

Mostly clearcoat in my wallet lol.....well, I know liquor is quicker, but I've stuck to beer for the last...oh.....30yrs or so. A Ceaser is nice now and again, but the hard stuff was becoming a little too tasty in my early 20's...the mornings, afternoons, and evenings were getting a little rough. However, I've been known to knock back a few beers here and there ;)

[Weldangrind]

Stew, this thread started with celebrating your new Mikuni and went to who knows where. Sincere apologies for hijacking your thread like that. It seems that once we girls get chatting...

[katoranger]

Women :roll:

[PCD]

I will offer my humble apologies for the massive jack as well, although i DID sneak in some carb info at the beginning I think.

[MICRider]

Lol! It's all fine guys, love the banter... To me, that is what a forum should be :). And if you guys really do start clocking each other with a Hot Wheels radar gun, I want to see pics!

Regards,
Stew

[MICRider]

Oh! I meant to ask too, you said your current setup is one and a quarter turns on the mixture screw? Did you perhaps count how many turns it was out originally? I have only adjusted the idle so far but was wondering what the factory setting was on the Mik. Little harder to get to the mix screw on the Mik too, on the factory one I could turn it with my fingers if I contorted a bit...

Regards,
Stew

[Weldangrind]

I'm not at that point yet Stew, but TurboT was able to adjust the air / fuel screw on the stock carb with a very long flat blade screwdriver from underneath. There is clearance through the frame. I presume that the Mikuni will be similarly accessible.

[PCD]

Oh! I meant to ask too, you said your current setup is one and a quarter turns on the mixture screw? Did you perhaps count how many turns it was out originally? I have only adjusted the idle so far but was wondering what the factory setting was on the Mik. Little harder to get to the mix screw on the Mik too, on the factory one I could turn it with my fingers if I contorted a bit...

Regards,
Stew

I dont remember, BUT it came with a blue locating mark and was almost sitting flush. If you have the carb out of the bike it would be easy to turn it all the way in, then count the turns til the blue paint mark lines up again.

i could not get mine adjusted (Mikuni) with a long screwdriver from underneath. Too much frame crap in the way.

I used a 3" small slot....got it in with my left hand and held it, changed position, snuck my right hand in and adjusted it. there is a certain way to get at it and once you do it a few times its easy. remembering how is the tough part :)
EDIT: I think the stock carb was an air screw located at the rear of the carb where the Mikuni is a fuewl screw located at the front, maybe thats why i couldnt get at it.

[MICRider]

I never had a chance to tweak it tonight. Going to run it a bit more first and see how it does... Already runs way better than the stocker though! Fit and finish is very good too, the Mik looks like a quality piece. I will have to open the old one up some day and try to figure out why it was flooding so bad. When it wasn't bogging and stalling it ran well :). Wonder if Mikuni puts the paint marks on the screws so you can count the turns? Clever if so!

Regards,
Stew

[MICRider]

Oops! PCD mentioned using the colored dots to count the turns... Sorry, long day, I missed that :)

Regards,
Stew

[PCD]

Oops! PCD mentioned using the colored dots to count the turns... Sorry, long day, I missed that :)

Regards,
Stew

Heck, with so many posts lately i dont know whether Im coming or going. I will tell you that the little 3" slot screwdriver never leaves the bike anymore ;) It also has an advertising logo on it that I use as reference because the little mark on the screw goes bye-bye if you go below flush.

[MICRider]

Got a chance to tweak the carb a bit last weekend, and though I haven't had a chance to take it out for a good rip it seems to run really well now. Ended up having the mixture screw out about 2 and a quarter turns I think, slide clip is in stock position. Haven't ran it for about a week and I just hit the choke and the starter and it fired right up! About -2 in the garage too, so I am impressed. With the stock carb it would have started and stalled right away countless times. I still think they should put the Mik on at the factory, like they do on the 250 dirt bike :).

[PCD]

Glad to hear its working well for you. There's been a ton of fantastic information kicked around in the atv forum lately, we could probably troube shoot just about anything now!
My Mikuni ended up about 3 turns out. Plug and resticter plate in the nuffler are a nice tan colour and it starts easy but if cold it wants choke, lots of it. At 0•c it needs a couple minutes on full then a couple on half, but you can ride it no problem on half choke.

[Weldangrind]

I think that T's air / fuel screw is about 2.5 turns out now, but we haven't tested it yet. It'll be interesting to see how it performs with the 22.5 pilot and the 110 main. Here's hoping for second gear wheelies!

[PCD]

I think that T's air / fuel screw is about 2.5 turns out now, but we haven't tested it yet. It'll be interesting to see how it performs with the 22.5 pilot and the 110 main. Here's hoping for second gear wheelies!

That makes perfect sense. A lot of the Mikuni guides say that if you have to turn out as far as I am then its time to go up a jet size or two. I hate these guys (looking at you W&G) that do things PROPERLY for goodness sakes! What are they thinking!

No cheating on the wheelies either. You have to be in second already, not a first to second full throttle clutch dump sort of thing. I did that once and got sky in my face.
My wheelie video was not full throttle by the way. In first, if I yank it up and give it full throttle I think I can flip it.

I'm a little cautious though because I have an excellent memory for certain things...like climbing a 45 degree hill on the 3rd Honda Big Red sold in Ontario...in second gear....then bogging out and frantically hunting for first while hammering the throttle...then catching first and flippinig the bike over top of me...since I flipped slightly backwards, I would say it was like laying on your back and having a Honda Big Red dropped on you from 10ft up or so. Then the bike bounced off me and proceeded to roll down the hill, although since I had 4 broken ribs at the time I wasnt too worried about it.
On my back, in the dirt, staring at the sky, unable to move or breathe and 10 people on top of the hill laughing there asses off. Good times.

[suprf1y]

http://www.chinariders.net/modules.php?name=Forums&file=viewtopic&t=7983&highlight=mikuni

That was my result.
We made a breather out of 1 1/2" ABS, but haven't installed it yet. Installing a 105, and 110 main jet did nothing for power. We clocked it at 80km/hr top speed, but that was with it breaking up badly in top gear, top speed only. I am confident that (being at highest load/RPM) this is a rich condition, and fuel breakup. A leaner main jet may fix it, but it may not. This is a common with small single cylinder 4 strokes.
WD, we have had excellent luck with the Gio aftermarket CDI. We tested a number of their products, and this is one that I would recommend.

[PCD]

http://www.chinariders.net/modules.php?name=Forums&file=viewtopic&t=7983&highlight=mikuni

That was my result.
We made a breather out of 1 1/2" ABS, but haven't installed it yet. Installing a 105, and 110 main jet did nothing for power. We clocked it at 80km/hr top speed, but that was with it breaking up badly in top gear, top speed only. I am confident that (being at highest load/RPM) this is a rich condition, and fuel breakup. A leaner main jet may fix it, but it may not. This is a common with small single cylinder 4 strokes.
WD, we have had excellent luck with the Gio aftermarket CDI. We tested a number of their products, and this is one that I would recommend.

Jeez, I dont know how I missed that dude. Thats pretty informative. Another Epic Fail on the search function for Pete, darn.

Weldangrind clued me in to one of those UNI filters. It has the correct neck diameter for the Mikuni and a 4" DOUBLE filter, coarse red foam on the outside and finer black foam underneath. They are meant to be seperated so you dont have to destroy it to clean or oil it.

I'm just dying to try it out but cant fit it due to my 19AH battery mod. I am currently using the angled intake hose supplied with the bike and a 125cc fake cone style breather. I have 1" between the back of the carb and the front of my battery box. Obviously I cut a rad in the front face of my box to accomodate the rubber 90 degree intake tube, but that wont cut it for the UNI filter.

My new battery cage is almost ready and when mounted I will do a little writeup. Its NOT going under the seat, I can tell you that much.

[Weldangrind]

Pete, maybe when you're done relocating the battery box and installing the Uni, you might like to install an ammo box where the battery once was. It would be very convenient as a small toolbox or a good place to store your camera and keys when you ride.

I mounted an old army surplus canvas walkie-talkie case to the fender of the Beast, and it easily holds my FRS radio or my camera. An ammo box is next.

[PCD]

Pete, maybe when you're done relocating the battery box and installing the Uni, you might like to install an ammo box where the battery once was. It would be very convenient as a small toolbox or a good place to store your camera and keys when you ride.

I mounted an old army surplus canvas walkie-talkie case to the fender of the Beast, and it easily holds my FRS radio or my camera. An ammo box is next.

My thoughts exactly. I'm making plans for that spot. A full size ammo box is too big (303, 30.06 or above). A .223 ammo box would fit, but I'm doing custom F/G and have a few surprises to show when I'm done....but battery comes first :) :)

[Weldangrind]

I'm amazed at all of the progress you make, despite your new avatar. It reminds me of a song (with apologies to Afroman): I was gonna fix my quad, but then I got high... :lol:

[PCD]

I'm amazed at all of the progress you make, despite your new avatar. It reminds me of a song (with apologies to Afroman): I was gonna fix my quad, but then I got high... :lol:

Thats my birthday, what else does it mean?

[Weldangrind]

Not knowing if you're kidding or not, I'll leave it between you and Google. :lol:

[MICRider]

Lol, I took the Beast out for a little honk tonight... Not sure if I had it fully warmed up or not (don't really think I did), it ran better but still not up to snuff. Bummer! So, I think I will be checking that intake for leaks and maybe cranking the mixture screw out another half or quarter turn. It's funny though, it will run really good, then start missing, farting, stalling... Definitely going to check the intake! Tis funny too, cause my sons 110 Mini-Beast, once warmed up runs flawlessly! Too bad my Beasty aint the same, but gives me something to play with I guess :). Tendonitis in my wrist has flared up again, so I cant really take it out for a proper ride anyway. Supposed to be nice for a few days here so I will try to get some more wrenching done on it in the evenings... Though no mods for me, just trying to get it to run right! :)

Regards,
Stew

[Weldangrind]

Stew, your tendonitis won't feel any better after trying to remove the intake tube. :lol: You can get a gear wrench on the upper bolt (8mm), but the bottom will only accept a box end wrench and will only give you about 1/8 of a turn at a time. You don't need to remove the carb from the intake tube though, so that's a bonus.

I recommend lotsa Ibuprofen.

[PCD]

Lol, I took the Beast out for a little honk tonight... Not sure if I had it fully warmed up or not (don't really think I did), it ran better but still not up to snuff. Bummer! So, I think I will be checking that intake for leaks and maybe cranking the mixture screw out another half or quarter turn. It's funny though, it will run really good, then start missing, farting, stalling... Definitely going to check the intake! Tis funny too, cause my sons 110 Mini-Beast, once warmed up runs flawlessly! Too bad my Beasty aint the same, but gives me something to play with I guess :). Tendonitis in my wrist has flared up again, so I cant really take it out for a proper ride anyway. Supposed to be nice for a few days here so I will try to get some more wrenching done on it in the evenings... Though no mods for me, just trying to get it to run right! :)

Regards,
Stew

Check the plug...takes 2 minutes. If that plug is dark at all crank that A/F screw out another half turn. Trust me, please.

W&G...my birthday is April 22/58...that should clarify matters :) :), but thatnks for the benefit of the doubt...always said you were a classy guy.

[waynev]

PCD, did you mean if the plug is dark to lean out the A/F mixture?, to lean the mixture wouldn't you have to screw in and not out ?

[PCD]

PCD, did you mean if the plug is dark to lean out the A/F mixture?, to lean the mixture wouldn't you have to screw in and not out ?

No.

Our Mikunis A/F screw is an AIR screw as opposed to other Mikunis with the screw at the front (or back, I forget now) which is a fuel screw.

If you read that link waynev posted it explains things nicely. Anyway, on MY Mikuni that bottom screw controls AIR, not fuel. Its exactly the reverse to what you are thinking.

[waynev]

Actually on my link i posted you will see that our A/F valve is at the front of the carb so that is fuel, the ones on my snowmobile were on the back which is air.

when the carb is on the bike that screw is closer to the front, the filter goes on the back.

[PCD]

Actually on my link i posted you will see that our A/F valve is at the front of the carb so that is fuel, the ones on my snowmobile were on the back which is air.

when the carb is on the bike that screw is closer to the front, the filter goes on the back.

I gotta remember to get under the bike on the SAME SIDE every time. Messes me up constantly.

[waynev]

Just wanted to make it clear.

If the screw is closer to the air filter than it's an AIR screw ( out is leaner) , if it closer to the manifold then it's a FUEL screw ( out is richer).

[Weldangrind]

Just wanted to make it clear.

If the screw is closer to the air filter than it's an AIR screw ( out is leaner) , if it closer to the manifold then it's a FUEL screw ( out is richer).

If we could somehow place this comment under the forum name in bold, we'd all be better off. I don't know why I can't get it through my thick skull. :lol:

[waynev]

Not a bad idea W&G, personally it's etched in my mind as i've been playing with mikuni's for 25 of my 39 years.

[Weldangrind]

For those who can't walk in to a local bike shop and buy Mikuni jets, nichesupply on eBay has a decent selection of main and pilot jets at a fair price. By comparison, I paid $5.00 each for mains and pilots over the counter.

[PCD]

Back to MICRider...my mechanical information was wrong, but the point of my post remains the same.

Leaning my Mikuni out made a huge difference. When it was rich I had a hard time starting (not insane, just harder than it should of been) and high speed breakup.

I leaned it out till I hit tan on the plug and tan on the funny little saltshaker baffle plate inside the Monster exhaust, now its perfect.

My apologies for getting things mixed up, glad I was straightened out, but I stand behind my original point.

[Weldangrind]

For further clarification when searching for Mikuni PZ30 jets, look for vm28/486 (pilot jet) and N100.604 (main jet). These guys have it figured out: http://www.carbparts.com/mikuni/mikuni_tuning.htm#Pilot Jets

[MICRider]

Lol, I understand what you all were getting at, if the plug is dark, crank the mixture screw in a quarter or half turn as that would be making it leaner, if the plug is too light crank it out a bit to richen it... I will definitely have to check that out. Funny things are though:
1) It lights right up... Give it a choke when cold and it doesn't even turn over once before it starts.
2) It idles beautifully, smooth and not too fast
3) Will run perfect for a few hundred yards going through the gears

Then it starts to stumble like it is not getting gas or something... Could that possibly be an intake leak or maybe something simpler like a collapsing fuel line? I never did replace the lines like the rest of you guys did and they are an awful soft line. Tricky to diagnose when it runs so well for a bit, then chokes. An intake leak would make it starve all the time yes? I will have to check a few things tomorrow when I get home from work. (and its warmer!)

Regards,
Stew

[Weldangrind]

Maybe your fuel filter is clogged Stew. BTW, snowmobile fuel line is a good choice for cold climates (it's transparent too).

[PCD]

You're bang on. If it were a pinched line it would most likely stay pinched all the time.
I'm going to ask you a silly question...you do shut the choke off right?
Other than that I would say its something changing with the engine afterr its warmed up.

[MICRider]

Fuel filter would be a good one to check... Maybe it's burning a bowl of gas and then starving on the next one, could be possible! Oh, and yup, I am shutting the choke off once it's warmed up... Not a silly question, the only silly question is the unasked one :) I will check the flow tomorrow after work if I get the chance. Certainly seems like a fuel delivery thing. Lol, though again, for the price I'm always amazed that it even runs! Thanks for the suggestions guys, I will get it sorted out, I just don't get much time to work on it.

Regards,
Stew

[MICRider]

Though... Lol, wouldn't it be funny if it turned out to just be the fuel filter when I replaced the whole carb thinking the original was bad? Good thing parts are cheap for these things :)

[PCD]

Fuel filter would be a good one to check... Maybe it's burning a bowl of gas and then starving on the next one, could be possible! Oh, and yup, I am shutting the choke off once it's warmed up... Not a silly question, the only silly question is the unasked one :) I will check the flow tomorrow after work if I get the chance. Certainly seems like a fuel delivery thing. Lol, though again, for the price I'm always amazed that it even runs! Thanks for the suggestions guys, I will get it sorted out, I just don't get much time to work on it.

Regards,
Stew

On the other hand, the collapsing fuel line is a possibilty.

That was pretty good thinking although I dont know how valid it is. Does the stock carb create enough vacuum to collapse a fuel line?

Hit up the snowmobile section in Canadian Tire. Mine just got some stock in and I had my pick of 10 different fuel filters and 3 types of fuel line types not including 3/16" size.

EDIT: I got the pink fuel line thats more expensive, but stays flexible to -40.0 degrees Celsius. 5/16 :) :)

[Weldangrind]

I'm not sure on the cavitated fuel line question Pete, but if you remove the air filter for viewing, you'll see how engine vacuum will open the choke as you blip the throttle, even if the choke is fully closed.

[PCD]

Well I'm with you on that, but its going to work a lot harder with a filtr on it I suspect.
I understand you were illustrating a point, but a littlr humor never killed anyone and I really do ride with a filtrer on ;)

[PCD]

Damn R key is stuck on the berry.

[TurboT]

Geeze I spend the night playing Dragon's Age: Origins like a nerd and you guys go balls out with 3 pages of posts. :) That'll tech me!

My eyes are crossing now reading all the useful information.

[MICRider]

Lol, only reason I mentioned the fuel line was because I read somewhere else that the cheap lines were prone to kinking and collapsing. I will check the plug and the filter tonight and see how they look if I get a chance. Thanks for all the ideas guys, your top notch! :)