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I've been having this phantom problem where I blip the throttle while the bike is idling and sometimes it will rev up to 3-4k rpm and just stay there. Is this a vboost problem maybe? Background: Shotgun carb clean has been done, carbs are synced, intake boots replaced, valves adjusted, throttle...

Hi guys, I have an '89 that I'm trying hard not to throw off a cliff. I've replaced a ton of parts to try and get this bike ride-able and reliable. For some reason I can't get the middle gear oil drain bolt to stop leaking! I've replaced the bolt with the official Yamaha one as well as tried 2...