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 PARTNER 650, F65, K20, K65, K650, R20, R21, R420, S65 [#505340782]

$41.62

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Piston Kit fit PARTNER 650, F65, K20, K65, K650, R20, R21, R420, S65 [#505340782] 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 for the following PARTNERSpare Parts for PARTNER machines models, 48mm in diameter, which replaces OEM Part #505 34 07-82:

650 (1987-01)

K650
K650 Mark II (1987-1992), 65cc
K650 Super (1992-1994), 65cc

R20
R20T

R21
R21T

R420

R420T
R421T

Our Piston Kits are branded and come directly from the top-quality Manufacturer METEOR.
We mention our Suppliers in all our listings, because we’re proud of them. No parts in white boxes — No fictitious brands!
Protect your valuable PARTNER machine. Use only Branded & High−Quality Parts. Better Safe than Sorry!

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Specifications

Specifications
Country of Origin	Italy
Product Code	1003828
Compatible Brand	PARTNER / PIONEER
Compatible Models	PARTNER / PIONEER R420T, S65, R420, F65, K650 Super, K65, K650, R21, R20T, R20, 650, K20, K650 Mark II, R421T, R21T
OEM Part #	505340782

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