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When opening the throttle, doesn't seem to matter which speed or RPM, there is a noticeable thump/knock. For this to happen the bike has to be in gear. It doesn't happen when you roll on the throttle really slow. After replacing the drive shaft oil the thump/knock became even harder.

Can someone tell me what is producing this sound?

  • Put the bike on a stand with engine in gear and rock the rear wheel. Is there play or any clunks? Check all of your engine mounts to make sure engine is secure. – Sir Swears-a-lot Apr 6 at 1:13

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