falconkid417
03-15-2011, 08:36 PM
hey i have a 87 trx250r it has a fmf fatty head powercore pipe v force reeds and i am boring it to 20 over and i need to know what size main jet and poilet jet i need?
89rebel
03-21-2011, 03:19 PM
1-2 mainjet sizes more likely, your air screw will change from day 2 day. I had the same setup on my 86,.060 over and had 42 sj, middle clip pos and 158 main.
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