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.

Compatible with the 66/80cc BBR Tuning Bullet Train Electric Start Engine and most Grubee Skyhawk Bicycle Engine Kits

Part #25 on the Crankcase Diagram

Package includes

66/80cc Piston #25 Part Number (See Parts Manual): 2-25 or D2-35

Piston Measurements:
Height: 50mm
Width: 47mm
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.