G290PUM Engine Replacement Piston - Zenoah K574791001  [K574791001]

Zenoah G290PUM Replacement Piston

The Zenoah K574791001 piston is an RC-scale replacement intended specifically for the G290PUM engine family. It functions as the reciprocating combustion component in small two-stroke Zenoah engines and is suitable for restoring worn internals during a rebuild.

Compatibility is indicated by the G290PUM designation in the product title, so fitment should be confirmed against the G290PUM specification on your engine before installation. When fitting a new piston, inspect the cylinder surface and ring seating to ensure correct compression and sealing for reliable operation.

Installation notes: clean all mating faces, check the wrist pin bore and circlips for correct fit, and use standard small two-stroke reassembly practices. Apply appropriate assembly lubricant during break-in and confirm free rotation before the first running session. No specialist tools are required beyond typical RC workshop equipment.

Tuning role: piston condition and precise fit affect compression and throttle response, so a correctly fitted K574791001 contributes to consistent power delivery and predictable carburetion and exhaust tuning on G290PUM engines.