Zenoah K574791001 High-Precision Piston for G290PUM  [K574791001]

Precision Piston for G290PUM Engines

The Zenoah K574791001 piston serves as a replacement piston for the G290PUM engine family used in small two-stroke RC models. It replaces the moving combustion element and is chosen when renewing worn internals during maintenance.

Fitment is identified by the G290PUM reference in the product name; confirm compatibility with your engine model before fitting. Prior to final assembly, inspect the cylinder wall and ring seats to ensure the piston will achieve the intended compression and sealing characteristics.

Installation advice: thoroughly clean contact surfaces, verify the wrist pin bore for correct tolerance and secure the circlips properly. Use common RC workshop tools and apply recommended lubrication during initial running. Check that the assembly rotates freely before first operation.

Tuning impact: piston condition and clearance influence compression ratio and throttle response, so a well-fitted K574791001 helps maintain steady power delivery and aids predictable carburetor and exhaust tuning on G290PUM engines.