Starter Pulley Washer, compatible with OS Starter Systems - Hirobo HI0404010  [HI0404010]

Replacement pulley spacer for OS starter fitment

The Hirobo HI0404010 starter pulley washer functions as a dedicated spacer within pull-start assemblies that accept OS Starter Systems, preserving axial spacing and consistent engagement between pulley elements.

Commonly included in spare part lists for Hirobo Eagle, Freya, EX and SX helicopter maintenance, this washer fits pull-start assemblies using the same washer profile as OS Starter Systems. It is supplied as a single unit suitable for repair and routine service work.

Installation is a routine job for hobby technicians: remove the starter housing, observe the pulley and spacer order, replace the worn washer, and reassemble while maintaining the original alignment and preload. No special tools beyond standard hobby drivers and pliers are typically needed; take care with any small circlips or springs.

Tuning impact: renewing a worn or compressed washer helps restore correct engagement geometry, reducing starter slippage and delivering more consistent pull-start behavior during maintenance and field operation.