ChinaRiders Forums - View Single Post - Gio X31 build-up thread

goofyexponent · 01-12-2012, 05:35 PM

1992 XR200R

65.5MM Bore and 57.8MM stroke

MY engine is a Zongshen CB350

65MM bore and 67MM stroke.

My TDC clearance is roughly 0.072" ot 1.84MM

The honda piston is about 3.56mm taller than my stock Zongshen piston.

I wonder is I can mill down the piston to make it work. I am near the top of the cylinder now when the piston is at TDC. I can reassemble and take a definite measurement of the piston when it is at TDC.

At best, I think I have 0.085" clearance when assembled with the stock head and base gaskets.

Is there a thicker base gasket I can run?

01-12-2012, 05:35 PM	#21
goofyexponent Join Date: Jul 2011 Location: Halifax, N.S. Posts: 145	1992 XR200R 65.5MM Bore and 57.8MM stroke MY engine is a Zongshen CB350 65MM bore and 67MM stroke. My TDC clearance is roughly 0.072" ot 1.84MM The honda piston is about 3.56mm taller than my stock Zongshen piston. I wonder is I can mill down the piston to make it work. I am near the top of the cylinder now when the piston is at TDC. I can reassemble and take a definite measurement of the piston when it is at TDC. At best, I think I have 0.085" clearance when assembled with the stock head and base gaskets. Is there a thicker base gasket I can run? __________________ Gio X31 Paid $440 for the bike new in the crate! Currently a modified, high compression, head turning MONSTER!
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