i just got a 86 trx250r. i rebuilt the motor .020 over. it has a fmf fatty pipe and silencer. i changed the gearing down to 13/39. i will be riding at pismo and in northern cali. where should i start on jet size. thanks

 

man thats a question 4 the ages ,,if i were you call fmf and they'll tell you everything --main jet -air screw-and needle clip good luck-