43mm Piston Kit Fits Husqvarna 545 550XP 577047002

A 43mm piston kit for the Husqvarna 545 and 550XP chainsaws. It replaces 577047002, since superseded to 577047008. A scored piston is usually a lean condition, so pressure and vacuum test the crankcase and fix any air leak or fuel fault before the new piston goes in. Measure ring end gap in the bore, use a ring compressor and fit the circlips fully.

• PISTON KIT - Piston, rings, wrist pin and circlips.
• FITS HUSQVARNA 545 AND 550XP - Check the model on the starter cover and measure the old piston before ordering.
• REPLACES 577047002 - Since superseded to 577047008, so either number gets you here.
• CHECK RING END GAP IN THIS CYLINDER - Square the ring in the bore, measure the gap with a feeler, and check side clearance in the groove. Use a ring compressor and fit the circlips with the open end away from the notch.
• FIND THE CAUSE FIRST - A scored piston is usually a lean condition: an air leak at the intake or crank seals, or a fuel fault. Pressure and vacuum test the crankcase before the new piston goes in.