89 yz 250 jetting

[chevelle]

I got a new fmf gold pipe with power core now FMF say to start with a 45 pilot and a 370 main now stock is 60 pilot and 340 main isn't 370 a little high

[monkeyonahill]

dont jump from 60 to 45 pilot. that's a huge jump. step down in incriments of 5. and only do one jet at a time. and as for the main jet do in incriments of 10 (that's how i do it at least). plus how is it running now witht he stock jetting? rich on the bottom?

[chevelle]

rich on both idle seems ok little 2 stroke smoke but top end rich at 340 main i drop the pilot to 50 seems good just a pain to get the main right i think i'll try a 330 and drop the needle to see if that work.I was told to try a 40:1 with the 330 main but tried it and man smelled like raw fuel if i run 40:1 i think i have to go down to maybe a 290 with adding more fuel so i sticking with a 32:1 redline racing two stroke