Piston, GX390, Forged Flat-Top, Drop-in Design, Standard

Description

Forged Flat-Top Piston to Fit GX390 and UT2 GX340
Stock 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-88-046046104-B.
*Wrist pin and clips included, but rings are not included!