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You have not supplied enough information for us to be much help to you. At the least we need to know bike model and year and some description of the problem.

Without knowing anything else the most I can tell you is to check the cam chain adjuster to see if it is working correctly and keeping the cam chain properly tensioned.
 

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Barry B wants help with a dieseling sound. The sound does not go away when engine is reved up. Bike runs and drives fine. Sound gets louder as rpm increases. Sound seems to come from the front rather than transmission area.
 

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Given those symptoms, my advice to check the cam chain adjuster still stands. That would be the most likely culprit given those symptoms. If it is the cam chain adjuster and he keeps riding it then damage to the engine is likely.

If the adjuster is functioning correctly then check the valve clearance. If it is to wide then you will get a rattling sound from the valves. For that matter since you have to pull the valve cover to check the adjuster it would be a good idea to check the valve clearance at the same time anyway.
 
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