Echo CS-271T 26.9cc Piston Kit 35mm Rings Pin P021044060

Piston kit for the Echo CS-271T top handle chainsaw, 35mm bore. Replaces Echo part number P021044060. The kit contains the piston, its ring set, the wrist pin and the circlips. CONTENTS AND WHAT IS NOT INCLUDED. Piston, rings, wrist pin, circlips. The cylinder is not included, so this suits an engine whose bore is still serviceable. Gaskets and crankshaft seals are not included and both are worth doing while the engine is apart. If the bore is scored or has lost its plating, the cylinder needs replacing too and a piston alone will not fix it. BEFORE YOU REASSEMBLE. A scored or seized piston on one of these saws is almost always a symptom rather than the cause. The common causes are a hardened crankshaft seal, a split or perished impulse line, and a loose or cracked intake boot, all of which lean the mixture out. Pressure and vacuum test the crankcase and fix the leak before the new piston goes in. ON ASSEMBLY. Check ring end gap in the cylinder the rings will run in, not the old one, and check side clearance in the piston groove. Hone the bore so the rings have something to bed against. Use a ring compressor, fit the circlips with the open end away from the ports, and turn the engine over by hand before you start it.

• 35MM PISTON KIT FOR THE ECHO CS-271T - Piston, piston rings, wrist pin and circlips, replacing Echo part number P021044060. This is the 26.9cc top handle arborist saw. The kit is what you want when the saw has lost compression, will not hold an idle, or has scored its bore after running lean or on fuel that sat over a winter.
• WHAT IS IN THE BOX, AND WHAT IS NOT - Piston, rings, wrist pin and circlips. The cylinder is NOT included, so this is the kit for a bore that is still good. Gaskets and crankshaft seals are not included either, and both are worth replacing while the engine is open. If the bore itself is scored, you need the cylinder as well and this is not the whole job.
• FIND OUT WHY THE OLD ONE FAILED BEFORE IT GOES BACK TOGETHER - A scored piston had a cause, and the usual cause on a small top handle saw is a lean mixture: a hardened crankshaft seal, a split impulse line, or a loose intake boot. Pressure and vacuum test the crankcase before reassembly. Fit a new piston to the same air leak and it will go the same way.
• CHECK RING END GAP IN THIS CYLINDER - Square each ring in the bore it will actually run in, measure the gap with a feeler gauge, and check side clearance in the piston groove while you are there. A ring that closes up at operating temperature breaks a land, and that is a new piston again.
• ON ASSEMBLY - Hone the bore lightly so the rings have a surface to bed into, use a ring compressor, and fit the circlips with the open end turned away from the ports. Turn the engine over by hand before the first start, and run the first tank slightly rich while the rings seat.