I have a 39 pwk on my 92 lt 250r and it came with a 172 main jet and a 62 slow jet as they call it in the manual, Can any one tell me what size they are running, It started, but it is real rich, and will not idle on its own. And what about the air screw, how far out, I live in Omaha Nebraska, dont know the elevation.

 

your pilot should be close to 50 or mid 50s main sounds right as im running 172 in my 38mm dont quote me as your elevation should play key role im in michigan.

 

Thanks I'll Try starting around there