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If it does have a hole, you could use this opportunity to build a larger displacement motor. You can find cylinders and pistons that feed 250 and beyond on Taobao. You might have to open up the case mouth to accept a larger cylinder.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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