for those who know jetting??

[studbacker56]

ok i just got a HMF slip on for a honda 250x and i bought the 125 jet it said.didnt notice no power gains at all.so i went and bought a 130 and still no power gains. so i bought a 140 and moved the needle clip up one position and put it in and i noticed the 4HP power gains and the plug looked to me to be right. my question is does it seem right to go from a 122 main jet to a 140 main jet by just adding a slip on, header, and removed lid?? thats a hell of a jump. should i change the stock 32 pilot with that jump?? i also have a k&n filter, white brothers header, and removed air lid, and the slip on?

[cals400ex]

i think with a full sparks exhaust, no air box lid, around 70-80 degrees, and sea level elevation, sparks says to use a 135 keihin mainjet. however, this was for a 300ex. their stock mainjet is a keihin 122. but i don't know about a 250x.