I know this isn't an SC quesion, but you guys have been a lot more helpful than the motorcycle forum I'm on, so here we go. This all started after I adjusted the cam chain tension... It was noisy and I didn't have the automatic adjuster, so I set the engine to the proper crankshaft position, and I tightened the chain, and it never really ran right after that. I think that timing is now off. Here's what happens: It can be difficult to start, even with full choke, and once its running, you can't get the revs to climb at all. You crack the throttle slightly, just a slight change in engine sound, not in speed. Full throttle, big change in sound, no change in speed. Could that be from timing being very advanced or retarded?