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General 4 Stroke Jetting questions
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Posted by: YZThumper---------------------
I've been a 2 smoke guy ever since I've thrown a leg over a bike, and I've become pretty adept at jetting my 2 strokes. Now I've picked up a YZ 426F and I've some questions on how to determine the right jetting for this bike.
My main concern is the bog off bottom when I wick the throttle. I've done the BK mod and it seems to have helped eliminate some of the bog, but it still persists now and then. I'm running 94 Octane, jetting is stock except for the 168 main I installed. When decelerating the bike will pop, so what does that mean for a 4 stroke . . . Rich or Lean ?? Since this happens during deceleration, what circuit is the culprit . . . Pilot, Needle, or Main ??
In general the bike runs pretty good, but I have a sneaking suspicion there is some hidden power hanging around with the right jetting.
Posted by: biglou---------------------
Popping on decel is lean. However, I've read on here that an occaisional pop is not all bad. Now, if I could just remember why.:think
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