I was thinking that could be the problem, but the fact that it revs up and runs high power at high rpms means that those cylinders are getting compression imo. I agree with the valves. I completely removed the carbs and airbox and I'm going to pull the engine out of the bike on Sunday so I can take the head off and see whats going on. Do you think there's any chance that the carbs could be at fault (should I rebuild the carbs tonight)?
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