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Message: [QUOTE="KTM Mike, post: 1084258, member: 22658"] Yes..this is a 2 stroke. Exhaust control (power valve) should have no impact on the jetting however. Hotter plug would to me, only seem to make things worse, not better..that is why i tried a step colder. But no difference. I did attempt to see if it was a left main...pulled ignition cover, started bike and while running tried to spray some WD40 in general area of left main seal. I am not so sure I was able to get a consistent enough spray on target (hard to hit when it is behind the stator plate and flywheel!)...but for what ever it is worth...with a steady stream spraying in there, no change on how the bike was running. It it were a right main, I would be sucking in tranny oil and blowing white smoke...so not that. To listen to the bike sittin on the stand idling...it simply sounds like a well running bike...emitting no smoke at all! (other than at inital start up). I also did put the choke on while it was running at idle on the stand. (and already warm). It stumbled, kept running, started puffing some smoke, then did stall. So clearly it is leaner than with choke on! (As it should be...not sure why I did check that - curious I guess.) So..my next step...hmmm...just to rule it out, I will buy some new gas, mix it up fresh. see if that could be it (for the life of me i cant see why it would be though). FWIW, I am running Amsoil Dominator (full synthetic) at 40 to 1. [/QUOTE]