The Piston Wrist Pin #5 connects the piston of any 2-Stroke Motorized Bicycle to the crank arm of the bicycle engine's crank. The pin goes through the piston pin port and needle bearing (or bushing) on the crank arm to keep the piston secure while moving in and out of the cylinder, giving you consistent fuel combustion and air compression.
This wrist pin measures ~10mm in diameter and fits 2-cycle 66/80cc engine piston #5. Compatible with a huge range of motors, this connecting pin is simple to replace and easy to install. When it comes time to replace your stock piston or even upgrade to a windowed piston, you'll need to replace the piston pin to make sure your engine runs smoothly.