GPH 346 Flywheel Washer Replacement for RC Helicopter - Hirobo HI0403226  [HI0403226]

GPH 346 flywheel washer overview

This Hirobo HI0403226 flywheel washer serves as a direct replacement for GPH 346 engine assemblies used in RC helicopters. It provides the interface between the flywheel and crank to preserve correct spacing and positional stability during engine operation.

Supplied as a single washer, it addresses clearance and alignment within the flywheel stack. In normal operation it supports consistent engagement between the flywheel and mating parts, helping smoother idle behavior and dependable starting on nitro and piston model engines.

Installation notes: confirm correct orientation on the flywheel shaft and verify axial clearance after assembly. Recheck runout and ensure a secure fit before flight testing. If vibration or rubbing occurs, inspect mating surfaces for wear and replace damaged components rather than force-fitting parts.

Tuning role: the washer is used in small adjustments when balancing the engine and setting clearances. Using the specified washer keeps the flywheel positioned as intended by the engine layout, aiding repeatable timing and predictable throttle response during trim.