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1972 cb750 26,000 miles. No major engine work that I know of. I got a compression tester. #1 150lbs #2 150lbs #3 145lbs #4 125lbs Took it for a ride. Only makes the noise when the engine is unloaded. With a load on the engine it runs great. Noise is usually at lower speed. If I hold the brake...

Hey guys, new here. Need help figuring out engine noise after warm up about 10 minutes+/- from a cold start. Starts fine and idles good but after warm up it develops a noise and starts running rough. I've synced the carbs, adjusted the valves, did the cam chain tensioner and changed the oil...