44mm Piston Kit Fits Echo CS-490 CS-500 Chainsaw P021036170

A 44mm piston kit for the Echo CS-490 and CS-500 chainsaws, replacing P021036170. 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 ECHO CS-490 AND CS-500 - Check the model on the saw and measure the old piston before ordering.
• REPLACES P021036170 - If your parts list shows that number for the piston, this kit covers it.
• 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.