Zenoah diaphragm pump for G-series engines
This K117281150 diaphragm pump is a direct replacement spare designed for Zenoah G-series RC engines. It serves as the fuel metering diaphragm assembly used on specified G200, G230, G231, G260 and G290 PU/PUH/PUM/RC engine variants, and is intended strictly as an RC-scale accessory for model engines.
Compatibility is stated in the product name, so confirm the engine code on your motor before ordering to ensure the part number matches your existing pump housing. The unit includes the diaphragm element without additional packing or fittings, and it is supplied as a single part for in-field replacement.
Installation notes: remove the carburetor assembly or pump cover per your engine manual, inspect the mating surfaces for debris, and fit the diaphragm with correct orientation to avoid pinching. Use the original screws and gaskets where applicable and torque to the engine manufacturer's recommendations to prevent air leaks. If you are unsure about access, consult your engine's service manual rather than improvising hardware changes.
Tuning role and troubleshooting: the diaphragm pump affects idle stability and throttle response by controlling fuel flow pulses to the carburetor. A hardened or torn diaphragm can cause lean running, inconsistent idling, or stalling under load. Replace the diaphragm if you observe fuel leakage, flat spots, or irregular idle that cannot be cured by carburetor adjustment alone.
Maintenance tips: inspect the diaphragm regularly for cracks and check the pump chamber for fuel varnish. Replace with the exact K117281150 part to retain stock pumping characteristics, and avoid modifying internal pump geometry which can introduce drivability issues.
