ORIGINAL: asmund
Hey, my 91 FX is like that too. I`ve been meaning to ask the very same question. It runs good by the way (12800 rpm on APC 13-6 with some modding)
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I used to get faked out by engines doing this sort of thing. I'd tear them apart and find nothing wrong. Put them back together and sometimes the same thing would happen, but sometimes it would vanish.
One of the other things that used to make me anxious was when an engine suddenly had a clunky sounding connecting rod. I later discovered that many engines will do this when they lose the oil between the wrist pin and the connecting rod big end. Whew!
Since I'm always riding Hobby People's donkey about charging too much, I thought I would mention that I just ordered a Magnum .91 two-stroke from them. Gotta let people know that I do like the folks at Hobby People and particularly their Magnum engines from time to time.
Ed Cregger