Replacement Piston G290PUM - Zenoah K574791001  [K574791001]

Piston Details for G290PUM

The Zenoah K574791001 is supplied as a replacement piston compatible with the G290PUM engine family used in small two-stroke RC models. It operates as the moving combustion part and is intended to replace worn or damaged pistons during engine service.

The G290PUM designation in the title signals intended compatibility; always confirm the piston matches your engine before installation. When replacing the piston, check the cylinder surface finish and confirm ring seating to secure correct compression and leak-free operation.

Fitment notes: clean and deburr mating surfaces, inspect the wrist pin bore and circlips for correct engagement, and follow standard two-stroke reassembly practices. Apply assembly lubricant to moving parts for break-in and ensure the crank and piston rotate freely before initial start.

Performance note: piston integrity and correct clearance influence compression and throttle response. A correctly installed K574791001 helps deliver consistent power and simplifies tuning of carburetion and exhaust on G290PUM engines.