I just picked up a 94 Yamaha Vmax 500. It had been sitting for a few years (with the occasional run up). Took it out a few times and noticed it bogging down when full trottle is applied. If I give it half throttle its goes good. Once accelerated at half throttle if I give it anymore it boggs down again. Ive tried all grades of gas with no noticeable difference. Any ideas?
1. Carbs/Gas/Oil: Have you cleaned the carbs, and replaced the gas and oil?
2. (My bet) Drive belt: this problem sounds like a classic worn/stretched drive belt. Also, going along with this, possibly clutches that need cleaning.
Thanks for the reply. I took the carbs off today to clean them and found one neddle jet was stuck. I poped it out and noticed some scoring on the neddle jet and cylinder wall of the carb. Any idea if the cylinder wall can be polished? I polished the neddle jet with crocus cloth but can't get into the cylinder. By the way, one of the main jets had a little bit of scum in it.
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