Cylinder kit for Oleo-Mac 941 941C, 941CX, GS410CX chainsaw 40mm

This Oleo-Mac 941 cylinder kit – a non-original 40 mm cylinder and piston kit designed for Oleo-Mac 941 series and GS 410 series gasoline chainsaws.

In the official Emak Oleo-Mac 941 C and GS 410 CX engine parts catalogs the complete cylinder 50172021 and the 40 mm piston assembly 50120034A are listed. The same 50172021 cylinder is also used in Oleo-Mac 941 CX, 941 and GS 410 C models.

Compatible Oleo-Mac Models

Kit is suitable for:

Oleo-Mac 941
Oleo-Mac 941 C
Oleo-Mac 941 CX
Oleo-Mac GS 410 C
Oleo-Mac GS 410 CX

Original cylinder number:

50172021

Original piston assembly number:

50120034A

Cylinder and piston diameter:

40 mm
Kit consists of

The 50172021 type cylinder and piston kit includes:

40 mm cylinder
40 mm piston
2 piston rings
Piston pin
2 pin retaining rings

This is a suitable kit for repairing the engine when the original cylinder or piston is scratched, has lost compression or is otherwise severely damaged.

What to check before installation

If the old piston or cylinder is heavily scored, simply installing a new kit and hoping for the best is not enough. Two-stroke engines sometimes punish such optimism very quickly.

Check the fuel supply, carburetor operation, intake sealing, crankshaft oil seals, and the fuel and oil mixture used. A lean mixture or extra air through a leaking intake system can quickly damage a new cylinder.

Also check the connecting rod, the top needle bearing and the crankshaft bearings before installation. There should be no old gasket or metal debris left in the crankcase.

When installing the piston, rings and cylinder wall, lightly lubricate them with clean two-stroke engine oil. Insert the piston in the correct direction and align the rings with their locating pins. Tighten the cylinder evenly according to the manufacturer's specified tightening sequence and torque.