80-90-100MPH is this for real? [Archive]

TheBrainII

06-11-2007, 09:31 AM

When I started looking at getting one these bikes (gy-5) I found most places listed the specs and a top speed form 60-65mph. Now I'm seeing a few places advertise them at 75, 80 or even 90mph top speed. I even saw one seller on ebay ad say "about 100mph" for a LF200. Something tells me this is pretty much impossible on these bikes no matter how it's geared. Is it possible the new OHC motor has a little more top end, and when they get going down hill in a tornado, drafting a truck, running 103oct. and NOX, with a midget driving, they might get close to 75?

red2003

06-11-2007, 09:36 AM

Sure with enough gearing and the right conditions, you could get to 75. But.... why would you want to? These bikes cruise well at 55 mph. They are NOT Interstate bikes, nor are they MX bikes either. They are a good commuter / trail bike and that's what they were designed to be.

fatboy250

06-11-2007, 10:59 AM

Is it possible the new OHC motor has a little more top end, and when they get going down hill in a tornado, drafting a truck, running 103oct. and NOX, with a midget driving, they might get close to 75?

Dad and I have been 75 with only the standard mods and I'm pretty sure I'm not a midget, unless there's another class of midget somewhere in the 5'11" 265lb range. :lol:

SamM

06-11-2007, 11:02 AM

pumpkin has had his American Lifan GY-5 to 72mph. I was beside him on my KTM checking his speed. With different gearing I'm sure 80mph and maybe a bit more is possible. I don't know about 90? Doubtful!

jkomp316

06-11-2007, 11:20 AM

you guys are crazy, the brakes aren't good enough to stop well at 60mph much less 75...

red2003

06-11-2007, 11:28 AM

you guys are crazy, the brakes aren't good enough to stop well at 60mph much less 75...

Agreed. These aren't sportbikes, and they aren't meant to be.

TeamCheap

06-11-2007, 12:39 PM

We really need a china bike get-together and we'll end this nonsense once and for all at the drag strip.

So does anyone know of a flat or slightly down hill road/trail/field about 3/4 of a mile long that has a prevailing tailwind?

We only need to have to different classes, one with the "cool boy" stickers and one without.(cause we all know the "cool boy" stickered bikes go faster)

AZ200cc

06-11-2007, 12:53 PM

http://aycu17.webshots.com/image/19096/2001066865236958288_rs.jpg (http://allyoucanupload.webshots.com/v/2001066865236958288)

This should do the trick...Now all we would need are 100mph winds.

SamM

06-11-2007, 01:49 PM

Now you're talkin'!

China bike drag races! Yeah!

red2003

06-11-2007, 01:55 PM

Somebody call Rich Christianson.

frostbite

06-11-2007, 02:07 PM

Somebody call an ambulance.

fatboy250

06-11-2007, 02:42 PM

you guys are crazy, the brakes aren't good enough to stop well at 60mph much less 75...

Hey I resemble that remark :lol: You know though, I've found the brakes to be pretty good for a bike that's definitely not a sport bike. I've even pulled a few stoppies just to show Dad what a stoppy was. :roll: Maybe the street rubber helps with the confidence in braking, but I rode the same with the old knobbies too.

Jason

jkomp316

06-11-2007, 02:51 PM

street tires would make a big difference. i guess... im used to riding sportbikes. its hard to have confidence in something that costs so little. i'm just amazed it still starts and runs.

fatboy250

06-11-2007, 03:05 PM

AZ200cc

06-11-2007, 03:08 PM

Does make You wonder who has the fastest DS on the site though :?

fatboy250

06-11-2007, 03:14 PM

Does make You wonder who has the fastest DS on the site though :?

I can tell you it wouldn't be me. I weigh 265lbs. Anyone with the standard mods and low bodyweight should be able to hit 70-75mph without much difficulty....faster would require more advanced engineering :lol:

TheOtherRide

06-11-2007, 04:12 PM

:lol: Good one, Frostbite! :lol:

AZ200cc

06-11-2007, 04:18 PM

CathastrophiX

06-11-2007, 04:31 PM

My bike did 81 Mph before i adjusted the valves, now it does 75 Mph.
I'm 183 cm, 86 kg. (Why did i write that, this ain't that type of forum is it) :D

fatboy250

06-11-2007, 04:44 PM

My bike did 81 Mph before i adjusted the valves, now it does 75 Mph.
I'm 183 cm, 86 kg. (Why did i write that, this ain't that type of forum is it) :D

Yeah 81mph is good, but at 190lbs Pauli's probably a better candidate for top speed honors.

TeamCheap

06-11-2007, 08:22 PM

Frostbite would be the fastest on this site since he could just ban anyone from the site that is faster :lol: :lol: :lol:

IronFist

06-12-2007, 12:37 AM

I got the slowest DS I think. WOT for me 92 KPH, that's Kanuk Kilometers per hour. 8O Once I had a kind wind. I hit 100, but I only have a 150cc. On a hill like that I'd pull in the clutch to go faster LOL :D

AZ200cc

06-12-2007, 12:43 AM

That would be about 57 MPH which would beat my top speed so far of 53 mph. I have not taken my ol bike to the limit but I doubt I could break 60.

TeamCheap

06-12-2007, 06:22 AM

According to my speedo mine can hit 60-70 pretty easily but it may be off because the kids on mopeds still pass me at those speeds but I think they have them hopped up.

Actually our bikes seem very capable of keeping up with the local traffic on all but the expressways but then I dont recommend riding these on the expressway.

AZ200cc

06-12-2007, 11:36 AM

Looks like CathastrophiX is the fastest so far...Who's going to step up and take the crown away?? :)

TeamCheap

06-12-2007, 04:33 PM

I think I could beat that 81mph, I'll have to see if the wife is willing to run next to me in her car and speed check me.

Since I have streamlined my bike the only thing sticking out is MY saddlebags. :lol:

IronFist

06-12-2007, 05:06 PM

That would be about 57 MPH which would beat my top speed so far of 53 mph. I have not taken my ol bike to the limit but I doubt I could break 60.

I was suprised. I think you'll be suprised too. There may be more at the top than you think. :D

AZ200cc

06-12-2007, 10:19 PM

Teamcheap might try to take this contest...But New2 My bike is an pile of steel and It is just to heavy to go much faster...I may have the slowest DS :cry:

TheOtherRide

06-12-2007, 10:23 PM

Ummmm....guys, I'm no lightweight...on the wrong side of 150 lbs at 5'8"...but thanks for the compliment! I haven't had mine over 50mph.

AZ200cc

06-12-2007, 10:29 PM

Well Otherride we probably weigh about the same And I am 6'2 I have to tell people that I am not riding a chicken those are really my legs. Do You think Your pink wheels can spin any faster or is that max speed?

SamM

06-12-2007, 10:34 PM

During the maiden voyage yesterday and before the tank problems, I had my Viva up to 60mph @ 7000rpm. It was very smooth and ran great. I was afraid to go much faster the first time out. Maybe next time! I have done the 520 conversion with new 12/35T sprockets and a new 520 D.I.D. chain.

AZ200cc

06-12-2007, 10:38 PM

Well Sam After the new tank and she is all broken in she might do 70 or more..Pretty darn good for one of these bikes.

IronFist

06-12-2007, 11:02 PM

If I fill my pockets with quarters I don't weigh 125LBs. If I rode the 2nd fastest bike, it would be the fastest. :D

justinkr58

06-13-2007, 12:06 PM

yea the bike has to be broken in...
one day my bike was sluggish and topped at 40 mph, and i gave my girl a ride around the neighborhood and the next day it took off (at around 200 miles on odometer)
does anyone think the extra weight on the bike had anything to do with the sudden mood change the next ride.?

shammash55

06-14-2007, 09:26 PM

sam what would be the 428 sproket size to match your speed, im trying to get my bike at that speed.

IronFist

06-15-2007, 03:30 AM

justinkr58 I don't know, but every oil change I did, the bike got faster, more responsive, and each gear had a little more travel than it did before. Well except the last oil change, OD says 1200K, I think its broken in now. After 200k I stopped babying it, the pro's may tell you different but that's when I started noticing the bike getting quicker. Just my experience, for what it's worth. Might be a valve thing, but I don't know enough to tell you "why", just what I experienced. I've only got a 150cc with a 15/46 sprocket set up, but I'm getting a very good top speed at WOT 95 kph depending on wind.

Question, did you find metal bits in your oil filter/screen the next time you did an oil change, after your double ride? I only found grindy bits once, after my first 100k+ ride. Seemed stronger after that. N2r.

zacstewart

06-16-2007, 01:16 AM

I noticed that my bike got faster and faster with each oil change too. It feels like it sheds some of it's sluggishness every time. I'm at 1200 miles right now and I ride it at 70+ miles per hour regularly.

SamM

06-16-2007, 02:41 AM

Posted by: shammash55
sam what would be the 428 sproket size to match your speed, im trying to get my bike at that speed.

The stock sprockets on my Viva were 56/17 which works out to a 3.29:1 gear ratio.

An American Lifan has 46/17 sprockets. These work out to a 2.70 gear ratio.

My new 520 sprockets are 35/12 and they provide a ratio of 2.91. I wanted a good compromise ratio for on and off-road use. When I downsift into 1st gear it slows the bike RIGHT now! It should work great off-road.

Personnally, I'd go with 50/17 if you want to stay with the stock type 428 sprockets and chain. You should be fine with the stock chain. It your stock rear sprocket a 56T? If so, you're golden with a 50T rear sprocket. The ratio would be 2.94:1. That's as close as I could get you to my ratio.

My front sprocket is rather small for my bike and is eating into my plastic chain guide. If I had it to do over, I'd go with a 38/13. These gears have a ratio of 2.92:1. Maybe a bigger front sprocket like a 15T and a rear sprocket about 40T would be a good compromise between on and off-road too! that would be a 2.80 ratio.

I hope this helps!

katoranger

06-16-2007, 10:03 AM

I tried and I could only get about 68mph with the 17/45 setup. Might need to get some more miles on it.

Allen

STcoldcrzy

06-16-2007, 10:13 AM

yesterday i took a Gps with me bike speedo got to 65mph Gps was at 57mph i am sure it was heading to 60
34mph on speedo was 30mph gps... 45 was 40 and so on 17/46 sprockets

tzrider

06-16-2007, 11:04 AM

Yeah I guess it won't be too long before Discovery Channel comes a callin' on me and Dad. :lol: :lol:

Did any one see this episode? A 250cc two stroke breaking the top speed record going something like 129mph??
http://www.thebeachcruiser.com/blog/SaltFlatsSunsetWeb.jpg

My 1977 TZ250D yamaha was clocked at 141 at the 1981 Daytona and the top 250 went 158. Modern 250s can exceed 175 mph. Record? Give me an RS250 Honda or a TZ250 Yamaha and I'll shatter that record bone stock!

That TZ was a pure race bike. The old ones like mine were piston port, needed a top end every 300 miles (piston kits) and a crank about ever 600 miles, not really viable street transportation. Modern ones have twin cranks, V twn lay outs, and get about 500 miles on a top end and about 1300 miles on a crank set. The one purpose these things have is racing, going fast on a closed road circuit, nothing else. You can see what I'm talking about if you tune in MotoGP 250 on Speed sometime. Evem my RS125 would aproach 140 mph top speeds at Texas World Speedway and my rider weight was around 190 at the time.

Looking at that picture, the chassis I don't know about, weird, but the motor looks like an old rotary valve Rotax or KR250 Kawasaki, either of which would push 150 mph in a GP chassis.

I don't have any pix of my old 250s, but here's a shot of the RS125. It's a 96 model. sold it in 2004 and I race minis only now. These things are too expensive on my post working budget to play with, but they sure were a lot of fun to ride. Nothing handles like a GP bike.

http://imageigloo.com/images/5295spphoto.JPG

tzrider

06-16-2007, 11:11 AM

BTW, every tool has it's purpose. My LS200 is a trail/around town bike. My SV650 is a 135 mph fun on the back roads and track day cheap sport bike. My Goldwing is my 1000 mile day in the saddle two wheeled car. I ain't takin' the wing off road in the mud and I ain't takin' the Diamo to a track day or on a trip to Aridzona. :wink:

That said, the Diamo will do a little over 100.........KPH...... :lol:

katoranger

06-16-2007, 01:50 PM

I am happy with the speed I can get. It can keep up with the traffic and not old anyone up and the roads I need to travel. I sure I can get it to 80 though. I just need to put it on the trailer.

Allen

tzrider

06-16-2007, 03:05 PM

When I was gearing mine, I went from a 54 rear to a 44. That got me up a little over 60 mph where before it wouldn't do 50 without sounding like it was going to float a valve. I've decided to keep it there, not gear any taller. Against a stiff wind, I have to lean into it and it'll get up to 55. And, too, off road, 1st gear is about as tall as it can be and be useful. I don't wanna get into tight stuff and have to slip the clutch or something. So, my gearing is a compromise for the uses I have for the bike. I have other bikes for other uses.

mdsuave13

06-16-2007, 07:36 PM

katoranger

06-16-2007, 09:05 PM

The 17/45 seems like a good compromise to me too. I can still do light off-road and also keep up with the traffice at 55. 55 is the max speed I need too.

Allen

IronFist

06-16-2007, 09:26 PM

[/quote] My front sprocket is rather small for my bike and is eating into my plastic chain guide. [/quote]

Mine is a rubber chain guide and is badly chewed. My stock 15 tooth isn't big enough. That's why I have to increase the size of my front sprocket before I can think about reducing the rear sprocket size. I have way more torque than I need on the street. What a great thing to say about your bike :D

tzrider

06-17-2007, 10:53 AM

before i modded my bike at all, i was able to get it to 78-80mph.

After i modded, it seems to pull better in the mid and high, but tapers off at around 70-75 now.

I weigh 160 and am 6'3". Its really not all that bad for top speed on a 200cc.

I've been looking at sv650's and kawi z1000's for riding around the back roads. either that or a yamaha road star warrior for bombing around... we'll see. I just got a card from my dealer saying that i could get financed for whatever i wanted... Which is veryyyyyy tempting.

Geared way tall and downhill with a hurricane force tail wind? :lol: I guess it's possible. I had a 1970 SS125 Honda twin street bike back in the day would run 70 mph with a tail wind and I got it to 80 once down a LONG hill with a tail wind. I don't know if I was floating valves, but it was revin' rather hard. :lol: I was 6 ft, 160 at the time. But, against a wind, figure on 45 mph, maybe 50 if you're flat on the tank and grabbin' the fork flat track style. It was rather over-geared, but it WOULD run 70 mph with a strong tail wind. That's not something I consider useful in the real world, though. If you have a tail wind goin', you gotta figure you're screwed comin' back. :lol:

fatboy250

06-18-2007, 09:44 AM

My 1977 TZ250D yamaha was clocked at 141 at the 1981 Daytona and the top 250 went 158. Modern 250s can exceed 175 mph. Record? Give me an RS250 Honda or a TZ250 Yamaha and I'll shatter that record bone stock!

Maybe I misunderstood what DC was saying but I thought the episode said he beat the previous record by 30mph or so. Now looking back over the information, maybe they were saying that's how much he beat Matt Hotch by. Here's a link to more info. http://www.motorcycle-usa.com/Article_Page.aspx?ArticleID=4561&Page=2

Jason

tzrider

06-18-2007, 10:58 AM

I just glanced over it. They're using some kart specific motor. Funny thing, the fast open class kart guys run TZ and RS 250 GP motorcycle engines because they're the fastest, most well developed engines in the world for making raw horsepower. A well tuned 250 will make 100 horsepower. Think about it, that's 400 horsepower per liter naturally aspirated and running on gasoline. If your Toyota Corolla could make that sort of specific horsepower, it'd be over 600 horsepower, no turbos, funny gas, or funny fuels. And, the 500s did make around 200 horsepower before MotoGP went to a four stroke format for the big bikes. This year, they're down to 800cc and the four strokes are making about 220 horsepower, not that much on the 500cc two strokes, and these are million dollar one off race bikes. The liter bikes last year were making 250 horsepower. Those bikes top over 200 mph on a long straight.

Here's a bit of a history of the TZ from 1981 (first power valve models and complete re-design that year) up. They don't cover the old motors patterned on the RD format very well, but that's anchient history. :lol: One of these little buggers now days will top 175+ mph on a straight and there's not a motorcycle on the planet that can match a 250 or 125GP in corner speed. These things are a hoot to race, but quite expensive to upkeep. Seems like a sin to "race" one in a straight line, though. These things are built for road racing, turning corners, draggin' knees, elbows, what ever. :lol:

A good rider on one of these things on a tight track can top the superbikes in lap times. I watched Ben Spies chase down Sam McDonald one year at Oak Hill Raceway in a CMRA race, a track near Henderson, Texas. Ben was TZ250 mounted, Sam was on a very trick R1 Yamaha superbike. Ben got off the line in about sixth and by lap 4 of an 8 lap sprint, was right on Sam's butt for the lead. Now, Sam McDonald is no slouch, a couple of times 250cc AMA champion back in the 80s and a former Honda superbike rider in the 80s. He was sideways trying to hook up the horsepower, riding the wheels off that R1 and Ben just stalked him down and embarrassed him with a 250! It was at that point that I knew Ben Spies was going to be special. He is the current AMA superbike champion and Team Yoshimura Suzuki superbike rider.

http://www.tz250racing.com/history_of_the_tz250_2.php

http://www.tz250racing.com/images/CorsersTZ1.jpg

fatboy250

06-18-2007, 03:49 PM

Seems like a sin to "race" one in a straight line, though. These things are built for road racing, turning corners, draggin' knees, elbows, what ever.

That's kinda how I feel about my china ride.....j/k. :roll: Anyway, thanks for keeping me straight. I would love to ride one of those GP bikes just to know what it feels like[probably like the bear on the tricycle]. I do my best with this little 200, occasionally dragging the footpegs..lots of fun on the interstate ramps. It would be cool to find a racing class that would fit this kind of bike.

Anybody else think it would be fun to race with other Chinariders? No japs or other brands just china made. You know tapping out all 14hp every lap :lol: racing on the cheap. $1000 and you're in....until something breaks.

tzrider

06-18-2007, 05:35 PM

I race with Texas Mini GP ( http://www.tmgps.8k.com ) and there are some of the little auto clutch china bikes that do rather well in the lightweight classes. The things can be fast! One guy and his wife raced a little 110 auto clutch chinese bike with a disc brake they paid 700 bucks for new, won the endurance championship in TMGP last year. The biggest bikes allowed are 150cc rour strokes, 80cc two strokes, though. I've won 7 sprint championships in TMGP on a motarded KX80, a 1988 model I have maybe 3K into total. It's the cheapest, and funnest racing I've ever done and a tight group of folks.

There could be a mini racing organization near you. http://www.teamcalamari.com/dox/racing.html

I've never really looked into the similarities of the little 110cc auto clutch china bikes and the XR Hondas, but you can get a lot of expensive go fast goodies for the hondas from Takegawa and Kitaco ( http://www.hondaminitrail.com ) that might work on some of the chinese stuff. I've seen some RADICAL fast XR50s sporting 125cc four valve Takegawa heads and such. One fellow claims the only thing on his XR50 that's stock is the cases and frame. I reckon, depending on how you wanna play, it CAN get expensive. :lol: Two strokes rule, though, and keep costs down. I beat that radical 125 guy on my $3K KX80 numerous times. :wink: It helped him out building that thing that he worked for Classic Honda, the importer, and got all the stuff at cost.

fatboy250

06-19-2007, 08:54 AM

Yeah I looked it up and there is one in SC about 1hr away. I may see if Dad wants to do something like this with me. That would be cool. Thanks for the information.

Good luck with your racing season.

Jason

shammash55

06-20-2007, 05:00 PM

sam my bike is a 17/46 now i get 45 at 6500rpms, i think that is a comfortable cruise rpm, kinda iffy on running 7k for any lenght. does that sound about right?i live offroad so it works great.love mountain gravel roads.

katoranger

06-20-2007, 07:13 PM

With 17/45 I get about 45 at 5500 rpm I think. 6500 is closer to 50.

Must be differences in the transmission ratios too. I you do more offroad then you probably want to keep it like it is.

Allen

monkeyboy

06-28-2008, 04:06 PM

My Diamo ls200 came stock with 15t front and 50t rear sprokets. No mods. After an oil change and a good thorough tuning/tightening I went over the 1000 km mark last night so I took her up to WOT for a minute. The GPS clocked me at 65 mph running up a long gradual incline.

While I love the gearing for offroad I would also love to have the ability to run 60 mph at a comfortable rpm onroad. Do any of you guys run a real tall gear for communting then change out to a low geared sproket for a weekend of camping/trails? Ah, you'd have to have two chains too, huh?

My technical question: assuming I should just keep my front at 15t, what size rear sproket should I run to perform well while giving me a comfortable 60-65 mph? Then the hard part, which one fits it. Maybe you other Diamo riders know of a part number?

While I don't plan to run expressway for prolonged periods, it would be nice to jump on for a few miles. I can get from my suburb into downtown seattle in a few minutes that way, versus 30 minutes and 30 lights via city arterial.

katoranger

06-28-2008, 04:11 PM

You could try to use a 17T front on the street with the 50T rear. That would help some. Probably get away with using the same chain then too.

Allen

mebigdave

06-29-2008, 03:38 AM

I have a Shineray XY200GYE 200cc with a 169FML pushrod motor with a 17/46 setup. I have done over 10,000Km on a pushrod motor(OHV). I use my Shineray for commuting 130km (65km each way) every day that is 95% highway use. I live 65km outside of Wellington, New Zealand and commute to work every day. As some of you may know, it can get very windy around here. When I have a head wind, I can be knocked back to 80km/h. I try to stick to 110km/h but this is not always easy to do with head winds. When I have a tail wind, I can get up to 120 - 125km/h. I am 6'4" and weigh about 135kg.

IronFist

06-29-2008, 01:54 PM

You could try to use a 17T front on the street with the 50T rear. That would help some. Probably get away with using the same chain then too.

Allen

Also I found swapping out the front sprocket a breeze. Don't know how your bike is. But I could have switched front sprockets in a parking lot fairly quickly. Changing the rear sprocket, you have to pull the rear wheel. Front sprocket you just adjust the chain length and check that the back break doesn't drag.

monkeyboy

06-29-2008, 02:34 PM

I see, maybe the front sprocket is the way to go. I think I will go that route first. Ease of changing would be invaluable. I forgot to add I'm in a 428 chain. Any pitfalls to watch for in changing to a 17t from a 15t front? I wonder about fitment mainly, hoping it fits in the case. Seems like my chain is in pretty heavy contact with that plastic swingarm protector...have any of you had this improved with a larger front sprocket?

The Diamo ls200 is just another clone and is pretty much identical in every way to your chinabikes. 428 chain, 15t front, 50t rear, 65 mph max but need that speed at a more comfy rpm.

Thanks for all the help and suggestions!

theENIGMATIC

06-30-2008, 09:16 AM

Those specs should have been in KMPH now your talking.I can get around 60-65 MPH which is just over 100KMPH.my user manual says 90KMPH top speed.I only weigh about 140 pounds!

theENIGMATIC

06-30-2008, 09:31 AM

I disagree these China bikes are also great racing bikes.if your opponent is your 75 year old granny who typically travels 10-20mph under the speed limit I laugh at them as I pass..but never under-estimate your opponent I had one zip passed me once and she threw her dentures out at me sending me flying all of 5 feet off my bike and barely scrapping my left knee....about as much damage as you are going to get falling off one of these puppies.OK.OK all this is just a lie.old grannies cant go 60mph!
China bikes also have way bettere acceleration than really really heavy transport trucks and buses..... :wink: