Originally Posted by CHOAS

My .28 crf rev is acting up.For it to idle the bottom has to be set lean and the hard scew idle alittle wider. Also fattened up the top considrable.
At this point she was running good.WOT, end of straight brakes,slowly drop rpm and idle for 15-30 second before loading up and gradualy droppinh rpm until it shut off. Ok was happy there but...
took it out on track ran 1 tank all was good.Took it out again and it just shut off wile on the gas.This happened 2-3 times.

fuel tank and lines new.removed all carb needles ,cleaned reassebled,front bearing not leaking a drop.carb past soapy whater test.

I I can see is much oil leaking out of the carb boot.Not sure if this wood effect.Thinking only other thing could be rear bearing or lost a wrist pin clip.did not do a full disasembly thet.

Final what other carb wouild fit the orion .28 rec crf?

Took the .28 out and put the .24 in to finish the day and never touched a needle on thaT.