HONDA GX31 UMK431 Cylinder & Piston Kit / Crankcase Set / Fan Cover

Complete 39mm cylinder and piston kit fits Honda GX31 and UMK431 engines used in strimmers and brushcutters, designed to fully restore proper engine compression, reliable power output and optimal internal geometry. This comprehensive kit includes a precision‑matched cylinder sleeve, piston, piston rings, wrist pin, circlips and all necessary gaskets, ensuring smooth piston movement, consistent combustion and stable engine performance. A practical replacement for worn or damaged engine components on compatible petrol garden power tools, helping maintain stable operation and extend engine life.

Fits specified Honda engines:

• GX31
• UMK431

Replaces part number:

• 11010-ZM5-030