[trx450r]

since the rings r failing in my 95 300ex ima go ahead and bore it out to a 330cc... wat jetting size shoud i use???
thatnks for help in advance

 

[TRX2fiveO]

I would say with the 330 kit you will have 11.5:1 CR so 135 to 140 main should be fine back the air screw out 1/2 turn reset the idle. you may have to step up the slow jet to a 40 too.

 

[trx450r]

the kit im getting it says it has the stock compression ratio.. would that change the jetting???