A 50cc high comp head on that cylinder will probably be too much compression. A stock 50cc head on the cylinder has to have it's squish band relieved a bit only to make for a pretty high CR. All of this prattle depends on how high the cylinder is on the case---think base gasket thickness. The intake port can be widened but put the piston in the cyl to make sure you don't make it wider than the piston skirt.
Re: porting on 70cc treats kit install
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