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

1st groove: Chrome-plated compression ring
2nd groove: Stepped Scraper Ring
3rd groove: Chrome-plated Slotted Oil Control Ring w/ Spring coil

The most common problem of a piston that needs replacement is in case there are scratches on its body.

What other parts I may need to replace when replacing the piston rings?

To replace the piston rings you need to disassemble the engine, so you also need to replace the cylinder gasket.

$26.92

In stock

Piston Ring Set for KOHLER Command CH5, CH6 Engines (2.638", 67mm) [#1510801S] and related spare parts.

This listing is about a brand new after-market top-quality Piston RingTips for safely installing piston rings Set made by the well-known OEM firm CABER, and fits KOHLERSpare Parts for KOHLER engines Command CH5, CH6 (5HP, 6HP) engines.

This Piston Ring SetTips for safely installing piston rings has diameter 2.638" (67 mm) STD, it replaces OEM Part #15 108 01-S, and consists of the following piston rings:

Our Piston Rings are branded and come directly from the top-quality and worldwide-known OEM Manufacturer CABER.
CABER Piston Rings are made from I-Cast Iron with high bending strength according to ISO STD 6621-3:1990 and DIN 70909.
Protect your valuable machine. Use only Branded & High-Quality Parts. Enjoy thousands hours of safe and trouble-free operation!