Zenoah G290PUM Piston K574791001  [K574791001]

G290PUM Piston Overview

The Zenoah K574791001 piston is an aftermarket replacement intended for the G290PUM engine family found in small two-stroke RC applications. It replaces the moving combustion element inside the engine and is used when renewing worn internals.

Reference to G290PUM in the product name indicates intended compatibility; confirm the part suits your specific engine variant before proceeding. When installing a replacement piston, assess the cylinder wall and ring seating to ensure the engine achieves proper compression and sealing.

Assembly notes: ensure all mating surfaces are thoroughly cleaned, check wrist pin alignment and circlip fitment, and follow routine two-stroke reassembly practice. Use appropriate assembly lubricant during break-in and verify free rotation prior to first use.

Tuning considerations: piston fit and condition directly affect compression and throttle response. Installing a correctly matched K574791001 will support steady power delivery and make carburetor and exhaust tuning more predictable on G290PUM engines.