How can I determine whether my cylinder is reusable so as to replace just the piston?

The most common problem of a cylinder that needs replacement is in case there are scratches into the surface of the tube where the piston runs.

What other parts I may need to replace on my machine when replacing the piston?

To replace the piston you need to disassemble the engine, so you also need to replace the cylinder gasket, at least. Also, it is recommended to check the piston bearing.

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Piston Kit for EFCO 136, 137, MT3700, MT3750, STARK 3810S, 3810T [#50110066]

$27.83

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Piston Kit for EFCO 136, 137, MT3700, MT3750, STARK 3810S, STARK 3810T Chainsaws, Brush-cutters [#50110066] and related spare parts.

Details

This listing is about a brand new after-market Piston KitHow to find the size of a piston ring in its original package that fits the following EFCOSpare parts for EFCO machines models, 38mm in diameter, and replaces OEM Part #50110066:

136 (after S/N 0406385823)
137
MT-3700
MT-3750
STARK 3810 S
STARK 3810 T

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Specifications

Specifications
Country of Origin	Taiwan
Product Code	1031546
Compatible Brand	EFCO
Compatible Models	EFCO 136, STARK 3810T, STARK 3810S, MT3750, MT3700, 137
OEM Part #	50110066

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