View Full Version : 300ex and jetting
when in gear and i get the revs high as i slowly drop the revs it backfires and i have a 128 main, am i running lean? im not sure they make bigger sizes for a 300ex and if i bought a 400ex carb what would i have to jet it at? please help
darrell43031
06-15-2003, 02:32 PM
it sounds a little lean. take your plug out and look at it after you ride it if it's a chocolate color it's good if it's real dark it's to rich. if it's to lite it's lean. and yes they make bigger and smaller jets for a 300
trueblue450
06-16-2003, 08:26 AM
Originally posted by Brad
when in gear and i get the revs high as i slowly drop the revs it backfires and i have a 128 main, am i running lean? im not sure they make bigger sizes for a 300ex and if i bought a 400ex carb what would i have to jet it at? please help
Try the fuel air screw.. in or out......
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