Hirobo HI0404010 Starter Pulley Washer for OS Starter Systems  [HI0404010]

Washer for pull-starts with OS Starter Systems

The Hirobo HI0404010 starter pulley washer is designed as a replacement spacer for pull-start assemblies that reference OS Starter Systems, maintaining the correct spacing and engagement among pulley parts.

It appears in parts lists for Hirobo Eagle, Freya, EX and SX helicopters and will fit any pull-start stack that accepts the same washer profile used with OS Starter Systems. The product is offered as a single unit for repair and routine maintenance tasks.

Fitting is practical for experienced hobbyists: remove the starter housing, document the pulley and spacer sequence, swap in the new washer, and reassemble while keeping original preload and alignment. Basic hobby drivers and pliers are sufficient; ensure clips and small springs are retained during the process.

Service tip: installing a fresh washer addresses flattened or worn spacing elements, which can eliminate starter slippage and restore consistent pull-start action during both bench checks and field runs.