Some quick suggestions:
it might be that the earlier mentioned idler gear has lost some teeth. Replace it with the reinforced Gear Set, part number 54262.
Is the mesh between the pinion and the main gear ok? It could make a weird sound if the mesh is too tight or too loose.
The diff could be too loose. Tighten it and see what happens.
Maybe you mean the sound when the Slipper slips? This should be easily to hear as it will only occur when you accelerate hard.
Canīt think of any other possibilities.
I ran my 201 for about 50 batteries now and apart from replacing the white gears for the reinforced ones and a worn pinion i had absolutely no problems.
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