The 1999 through 2004 Whizzers were built with the WC-1 engine, which has an inherent flaw in the design of the cylinder. The valve seats will ultimately come loose, more likely sooner than later. There really is no way to fix this once it happens, except to convert the engine to NE5 configuration using the NE upgrade kit. This is expensive, but it keeps your Whizzer from becoming a 100lb paperweight.

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EZ Motorbike Dealer - Quarryville, PA