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Questions & Answers
Runs and starts fine but
First impression was why would anyone rev their motorcycle to 9 grand in neutral? I could see if you were in gear clutch pulled and ready for a "drag" or Race Start but in neutral?
Anyway I can't hear it so if the sound is like it hits 9k and starts popping then two things either an over rev limiter which I doubtr because the engine red lines at 13,500 OR you have a set of spark plugs breaking down under load
check list , plugs , points , valve clearances , old fuel , slipping clutch
Sensor fuel tank
Clean carbs check for spark check that all your vacuum lines are in good shape and check for compression
Bike won't stay running
Sounds like You may need to look at a few things, Check Your fuel filter carbs may be full of dirt check for vacuum leaks carbs may need to be re-synced possible carb rebuilding time
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