ive got a yamaha jog r (same engine as aerox if it helps lol) ive put a technigas next r and 4.2 gram rollers but it stuggles 2 do 45 shud do at least 50 i was just wondered do i need 2 change the main jet because ive got a sports exhaust onit??

my mate has a aerox same exhaust but lighter rollers 3.5 gram and his does 55 60

fretwell, June 2008

i have a jog r with a technigas exhaust and it was reaching 20mph and then dying and after placing a larger main jet it was like a different bike and now i can get 60 on a good day.

spaniard, June 2008