Located within the cylinder body and crankcase, the 2-Stroke Piston #4 is one of the most important engine components. Connected to a connecting rod, this part moves in response to engine combustion. This results in crank movement via the transfer of force generated and in turn propels your bike forward. Featuring a 50mm diameter and 10mm skirt, this piston is compatible with a wide variety of 2-stroke engines.
Part #25 on the Crankcase Diagram
Package includes66/80cc Piston #25 Part Number (See Parts Manual): 2-25 or D2-35
Compatible with most Grubee Skyhawk Bicycle Engine Kits*
Skirt Width: 23mm
Skirt Height: 10mm
Piston Pin Port: 10mm
Height from Skirt to Piston Pin: 5mm
*As there are many different pistons for each model of engine, please read the measurements of our pistons and reference your existing piston to ensure a proper fit.