Quote:
Originally Posted by steelhorse
The noise seems to be coming more from the engine, or the top of the engine. It is like wannnn wannn wannn or wenn wenn but only at around 60 or 65 mph. 65 mph is about as much as I can get out my GZ. It runs fine and once warmed up it starts first time. 
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At that speed you are obviously on a highway. Could it be tire noise on a particular road surface.
Did you check the chain and sprockets? At 13,000 miles it could be the chain/sprockets if they are original.