Hey, my 89 used to behave like that too, mainly when I opened up the throttle it would buck a little & stall. I tried all sorts of things until one day I checked the petcock..yup, gunked up. Cleaned it and it's been running fine since then (knock on wood). Not saying that's what it is, but you might want to at least eliminate that possible problem.
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89 and 88 XT600.
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