Flywheel Washer for GPH 346 Engine - Hirobo HI0403226 Replacement  [HI0403226]

Replacement washer for GPH 346 applications

The Hirobo HI0403226 flywheel washer is offered as a direct replacement for GPH 346 engine assemblies in RC helicopters. It functions as the spacer between the flywheel and crank, maintaining the designed axial position during running.

Delivered as a single washer element, it resolves clearance and alignment needs inside the flywheel stack. In practice it helps sustain consistent engagement of the flywheel with linked components, aiding steady idle performance and reliable engine starts on model piston engines.

Installation notes: ensure the washer is fitted with correct orientation on the shaft and confirm axial clearance after assembly. Check runout and secure seating prior to flight testing. If rubbing or vibration appears, check mating surfaces for wear and replace any faulty parts rather than forcing assembly.

Tuning role: use this washer when performing small adjustments to engine balance and clearance. The correct washer keeps the flywheel positioned to support consistent timing and predictable throttle response during tuning and trim.