TT250 jets?

[turanic5038]

The only jets I can find for a Keihin pz30 take 3 months to ship from China. Anyone know where I can find a 100+ jets? I tried JD but they didnt have it although they had kits for larger Keihin carbs, and jetsrus seems to have some but I cant be sure im buying the right ones

[hertz9753]

I know MotoCheez and many others were changing the jets on their stock Hawk carbs. I don't know if it the carb though.

[mtiberio]

Drill baby, drill!

[Ariel Red Hunter]

The only jets I can find for a Keihin pz30 take 3 months to ship from China. Anyone know where I can find a 100+ jets? I tried JD but they didnt have it although they had kits for larger Keihin carbs, and jetsrus seems to have some but I cant be sure im buying the right ones Jets-r-us has keihan jets. Also Mikuni, of course. I suggest you take out the main and pilot jet, write down the numbers and call jets-r us for their recomendations.

[mtiberio]

http://sudco.com/Catalog37Digital/index.html#/154/

http://sudco.com/Catalog37Digital/index.html#/156/

[rojo_grande]

Here's a previous thread on the TT250 Carb.

http://www.chinariders.net/showthread.php?t=17013

See post #15. JetsRUs has main jets in stock. 99101-393 Genuine Keihin jets. Should arrive at your mailbox in a couple of days.

I haven't seen a replacement for the slow jet.

Rojo

[pcspecialist]

Post a picture of the slow jet, need to know if it uses a genuine Keihin or the elusive China jet and a picture will answer that as they look nothing alike.

I goofed when I drilled mine (elusive China jet), I thought I had grabbed one drill size up from the size that fit, but, turns out I grabbed two sizes up and it is now too big.

[turanic5038]

I goofed when I drilled mine (elusive China jet), I thought I had grabbed one drill size up from the size that fit, but, turns out I grabbed two sizes up and it is now too big.

Damn. That's rough. I'm going to assume its a legit keihin jet for now and order from jets r us, since I dont feel like taking out the carb before I have replacement jets. Got 110, 112, & 115, larger for the new exhaust I ordered

[mjstef]

$35 for a Mikuni Carb. MUCH better results.....

[pcspecialist]

if it is the same carb as the Hawk, you need Mikuni large round, not Keihin.

[mtiberio]

...
I goofed when I drilled mine (elusive China jet), I thought I had grabbed one drill size up from the size that fit, but, turns out I grabbed two sizes up and it is now too big.

jbweld and redrill

[ughmas]

Here's a previous thread on the TT250 Carb.

http://www.chinariders.net/showthread.php?t=17013

See post #15. JetsRUs has main jets in stock. 99101-393 Genuine Keihin jets. Should arrive at your mailbox in a couple of days.

I haven't seen a replacement for the slow jet.

Rojo

These are the ones I got, However I have not installed them yet. I believe they are correct (hopefully :))

['16 TT250]

When I was first at CSC looking at the TT and talking to Steve he said their guys had played with the carb a little. He didn't know the specs, but said they'd put in a bigger main and lowered the needle and it seemed to work well. This combo would richen at heavy throttle without richening the cruise throttle which makes sense to me. Maybe give them a call or email and see if they have jets and/or suggestions.

[turanic5038]

$35 for a Mikuni Carb. MUCH better results.....

just curious, whats different about the mikuni?

[Ariel Red Hunter]

just curious, whats different about the mikuni?MUCH easier to tune. Jets available in many places. Information easy to come by. The Mikuni VM26 works really well on this engine.

[Weldangrind]

jbweld and redrill

Since the jets are brass, you can even flow a little solder in and then redrill. Be careful with the 61-80 numbered drill bits online. The set I bought had only six different sizes in it, as confirmed with a digital vernier.

[schleppy]

I have this in its own thread, but I wanted to add it to this post. I recently picked up this jet kit from Amazon:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

And the jets work perfectly with the stock OEM carb. I went from the 105 to a 110, and it is substantially better than stock. I also moved the needle up one notch, and adjusted the idle mix screw out 1.5 turns. I'm at sea level.

Hoping this helps another TT250 owner.

[Essayons]

The Amazon link doesn't work. Not sure if it's just me.

[NzBrakelathes]

You can also check my eBay link as I have a kit that has jets of many sizes


https://www.ebay.com/itm/Hawk-250-Keihin-style-carb-tune-and-sprocket-set/303077495104?hash=item4690d39140:g:KmcAAOSwxL1cdk7 R

[Nikko Ski]

I just bought a CSC TT250 (as of June 2019) and have been following you folks for a few months. I was concerned about the CBs being lean so I did a lot of reading up here and elsewhere on what I needed to do when my bike arrived. Anyway, I hope I am posting correctly in response to this thread...So, I was under the assumption that the TT250 carb main was a 108 and it was suggested to change out to a 115, depending on your elevation, etc. Anyway, got the bike and noticed at about 5800 rpm or so, it would hesitate or bog slightly when WOT and really no more power beyond 6000 RPM. I contacted CSC and they sent me (3) main jets (Keihi), 110, 112 and 115, plus a 38 sized slow-jet or pilot jet(?), I believe it's called. I took the carb apart and saw my main was 102, and had to have my family confirm the number was right since I thought it was suppose to be 108 main; the slow or pilot was a 35. I put the 115 main in and swapped the 35 slow-jet with the 38. I put it back together and it ran really rough. I then put the 110 main in and returned the 35 back to it's home. I fired it up and it runs amazing! Night and day difference, especially through the WOT 6000-8000 rpm range....smooth and definitely more roll-on power in the higher rpm range. SO HAPPY!....I forgot, I'm at about 135 ft elevation.

[turanic5038]

I just bought a CSC TT250 (as of June 2019) and have been following you folks for a few months. I was concerned about the CBs being lean so I did a lot of reading up here and elsewhere on what I needed to do when my bike arrived. Anyway, I hope I am posting correctly in response to this thread...So, I was under the assumption that the TT250 carb main was a 108 and it was suggested to change out to a 115, depending on your elevation, etc. Anyway, got the bike and noticed at about 5800 rpm or so, it would hesitate or bog slightly when WOT and really no more power beyond 6000 RPM. I contacted CSC and they sent me (3) main jets (Keihi), 110, 112 and 115, plus a 38 sized slow-jet or pilot jet(?), I believe it's called. I took the carb apart and saw my main was 102, and had to have my family confirm the number was right since I thought it was suppose to be 108 main; the slow or pilot was a 35. I put the 115 main in and swapped the 35 slow-jet with the 38. I put it back together and it ran really rough. I then put the 110 main in and returned the 35 back to it's home. I fired it up and it runs amazing! Night and day difference, especially through the WOT 6000-8000 rpm range....smooth and definitely more roll-on power in the higher rpm range. SO HAPPY!....I forgot, I'm at about 135 ft elevation.

It's funny that you make this post as I'm having trouble with my carb now... I'm at about 100 ft above sea level running a 112 main. Having a similar problem at WOT so maybe I'll try to swap back to 110 main. I never messed around with the other jets. I've heard of some people adjusting the needle a notch or two also

[NzBrakelathes]

CSC has the jets.
I may also have the kit with jets as well

[Nikko Ski]

I wish I had more to add to what I did, but when all was said and done, the only change I made was from a 102 main to the 110 main jet. Nothing else was done and it runs great. So, much better than when it came out of the crate. Good luck!