Zenoah K574791001 Piston for G290PUM Engine  [K574791001]

G290PUM Engine Piston

This Zenoah K574791001 piston is an RC-scale replacement part intended for the G290PUM engine family. It serves as the moving combustion component inside the small two-stroke engine, designed for rebuilding or renewing worn engine internals on model applications.

Compatibility is indicated by the G290PUM designation in the product name, making this piston suitable where the original G290PUM piston is specified. When replacing the piston, check cylinder surface condition and ring seating before final assembly to ensure correct compression and sealing in the RC engine.

Installation notes: clean mating surfaces, inspect the wrist pin bore and circlips, and follow standard small two-stroke reassembly practice. Use appropriate lubrication during break-in and verify free rotation before first run. No special tools are required beyond common RC workshop tools.

Tuning role: piston condition and fit influence compression and response, so a correctly fitted piston contributes to predictable power delivery and consistent tuning of carburetion and exhaust on RC engines.