Seller notes

Forged Flat-Top Piston to Fit GX390 and UT2 GX340Stock bore uses factory compression height and stock wrist pin diameter so it will drop in using a standard length rod. No cutting of piston.New style pistons have valve reliefs for high-lift cams.This piston will provide approximately 1-1.5 points increase in compression. It can be used with our .040" longer rod for even more increase.Designed to use OEM Honda piston rings:13010-Z5R-004.Can also use aftermarket rings, NR Racing Part # RINGSET-88-...

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