KOSO Honda Grom/Monkey 61mm 4V Replacement Piston Kit Buzzetti Provides brighter and wider lighting

Provides brighter and wider lighting output compared to OEM

Soft-stem design

Air Spring

This Big Bore for the 2002-2009 Yamaha Zuma 50 2-Stroke will require a few modifications for a better running vehicle

KOSO Honda Grom/Monkey 61mm 4V Replacement Piston Kit Buzzetti Provides brighter and wider lightingKOSO's 4V Piston Kit for the Honda Grom Monkey is a complete piston to be installed in a cylinder kit that fits 4V Cylinder Heads. This is a forged piston that measures 61mm and includes a piston, pin, pin clips, and a set of rings. These are completely forged pistons and is highly prefered over cast pistons. The reason is cast pistons are made up of brittle content, over the much more stout forged piston. Although forged pistons are heavier, it makes