Timing chain connects the crank rotation to cam shaft which in turn actuates the inlet & exhaust valve. Timing chain in bikes have timing chain tensioner to reduce the slack in the timing chain, if tensioner fails there will noise near cylinder head in idle running itself. Then you need to replace whole timing chain, tensioner and sprocket. If you forget about noise use it, then it will misfire(like gunshot bang sound all of sudden) and cause major damage to the engine

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