GPH 346 Flywheel Spacer Washer for Engine Compatibility Hirobo HI0403226  [HI0403226]

Flywheel spacer for GPH 346

This Hirobo HI0403226 flywheel washer is supplied as a direct replacement for GPH 346 engine assemblies fitted to RC helicopters. It acts as the interface between flywheel and crank, keeping axial position and spacing stable under running conditions.

As a single washer component it addresses stack alignment and clearance requirements inside the flywheel assembly. In service it helps maintain reliable engagement between the flywheel and associated parts, contributing to smoother idle behaviour and consistent starting on nitro or piston model engines.

Installation notes: check the washer orientation on the flywheel shaft and measure axial clearance after fitting. Reassess runout and confirm the washer is seated correctly before any flight trials. If you notice vibration or rubbing, inspect the mating surfaces and replace worn items instead of forcing the fit.

Tuning role: this washer is useful for fine adjustments when setting engine balance and clearance. Installing the correct washer keeps the flywheel positioned as designed, supporting predictable timing and throttle response during trim work.