Piston Kit for Jonsered 70E Chainsaws, 50mm Bore

Restore the performance and reliability of your Jonsered 70E chainsaw with this precision-engineered piston kit. Designed specifically to replace OEM part number 50441008, this component set ensures a proper fit for engines with a 50mm bore. Maintaining the correct internal engine dimensions is critical for optimal combustion efficiency, power delivery, and long-term engine health. This kit provides the essential piston and ring assembly required to address wear and tear, ensuring your chainsaw operates smoothly under demanding conditions.

Accurate identification of engine specifications is paramount before purchasing this replacement part. The Jonsered 70E model may have been manufactured with different bore sizes over its production lifecycle, making horsepower ratings or model years unreliable indicators for parts compatibility. To ensure you select the correct kit, it is essential to measure the bore of your existing piston using a caliper. This direct measurement is the definitive method for determining the correct engine version. Additionally, proper installation requires verifying the ring end gap within the new cylinder, rather than relying on measurements from the old piston. Checking the side clearance in the piston groove and squaring the ring in the bore with a feeler gauge helps prevent potential damage to the cylinder lands due to thermal expansion during operation. Following these verification steps ensures a secure, leak-free fit that extends the service life of your equipment.