I have only a few rides since a series of enginge mods.
near the end of the day on my second serious ride, when I gave it power to go up a hill, it sputtered and crackeled. Next ride I experienced the same problem intermittantly.
When this condition occurs, if I pull in the clutch and peak the RPM, the problem goes away and it goes back to performing great, but will persist if I don't do something other than give it more throttle.
Background: I think I have the mains kinda rich, but it seemed to perform pretty well, so I figured I would leave it. Most of my riding is done under half throttle, so I am not sure if the main jet could be the problem anyway. Needles are in the middle clip and the machine performs great 80% of the time. (even decent low end torque on trails)
I thought maybe I was fouling plugs... They are pretty dark when I pull them, but I am not sure that means much. I don't have enough data to be precise (but do not want to burn my engine up collecting data)