Engine Help ? TB143

V2 and TB stroker are both Upgrades to your current set up.

In combination you with see significant gains.

Coil upgrades will likely be unnoticeable but will not hurt.

ok, i ordered the crank and im waiting to find a good deal on a V2 head

I saw a v2 head for sale in classified for like $280

yepp im gonna try to buy it

let me know how you like that setup. Im trying to decide between 143, v2, 55mm stroker or 165, v2, and stroker. how's the uflow fit on the carb btw? heard it doesnt fit... heard it fits... lol

ya ill let u knw bout the motor setup for sure , and the u flow will fit with the TB intake , you just need to move your coil back 2 holes and its a little tight but works

i just put the V2 head on tnight but didnt put the crank in yet , def gave it some more bottom end but it still doesnt seemed to be jetted right. I running a 26mm carb until i put my crank in then im gonna go to a 28mm. What carb settings are you guys running with this setup ?

Run the vm 26 with the 155 forsure! Stock jetting should be really close!!

I thought the main was 165 stock.. thats what mine came with.. I run mine how it came new and the stock jetting is right on.. hm

Someone must have changed my main jet while I wasn't looking lol I dunno how a 165 got in there.. But she runs good..





You'll love it after you install the crank !!

see i believe right now i have a 190 main and a 22.5 pilot but i dont have the crank in yet

change ur gearing

i have the same setup....no stroker. I love mine. running 175 main and a 20 pilot jet. I tried the 165 main.....too lean. Tried the 190 main and it was popping at full throttle like it was getting too much gas. 175/20 starts first kick and runs good. Currently running a 14t/ 40t sprockets. Gonna try a 37t or 38t for a rear just for comparison.

ive got the 143 kit with race head and stroker, manual clutch 26mm carb and lightened flywheel and i love it! pulls real hard, and still has alot of top end.

see mine runs great with the 190 main but just has no power like it should

Let us know what gearing you are running

What gearing are you running? Cuz I'm kinda having the opposite problem that you are. My bike has insane bottom and mid, but as soon as I get it 3rd gear tapped on a straight up to a jump (I ride alot of bigbike tracks) I can feel it just hit a wall and not want to accelerate anymore. It's to the point that when I'm coming off the lip of a jump like that it cuts out and the front end kamikaze dives on (almost had to change my pants one time).