When the bike is stopped in neutral without the clutch in it makes a rattling noise from the trans can anyone tell me what this might be

 

The noise I'm talking about takes place ONLY when the motorcycle is ROLLING while in NEUTRAL. I first noticed it while parking the bike, because the engine changed into off, however I expect the sound is still there while the engine is walking. It feels like a clack clack, nearly just like the chain, but the chain sounds more like a click on click.




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