Husqvarna 372XP Cylinder and Piston Kit

This Husqvarna 372XP cylinder and piston kit pairs a cylinder and piston for a full top-end rebuild on the 70.7cc saw. It is the fix for a scored piston, worn cylinder or low compression on a saw that is otherwise worth keeping.

Before you rebuild

Pistons rarely fail on their own. The usual causes are a lean condition from an air leak, a clogged fuel filter or a bad carburetor setting; bad fuel mix; or dirt getting past the air filter. If you drop a new kit on without finding the cause, it can fail the same way.

Check the intake boot, crank seals, fuel line and filter, and air filter before and during the rebuild.

Measure compression before and after the job with a proper gauge so you have a baseline for later. Note it in your shop log along with the date and hours. Many crews keep a 372XP running for years with one or two top-end jobs, and a clear record makes it easier to see when it is time for the next one, or when the saw has reached the end of its life.

Rebuild notes

Fit the piston with the arrow facing the exhaust side as marked, use new circlips and a new base gasket, and torque the cylinder evenly to the service manual spec. A pressure and vacuum test before startup is strongly recommended.

Run the first tanks with a properly mixed fuel and avoid long full-throttle cuts at first. Gaskets and seals are in our chainsaw parts section.