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

Pulley washer designed for OS starter assemblies

The Hirobo HI0404010 starter pulley washer is an RC-scale replacement spacer used in pull-start assemblies that are compatible with OS Starter Systems, ensuring correct axial spacing and steady engagement of pulley parts.

It is commonly catalogued among replacement parts for Hirobo Eagle, Freya, EX and SX helicopter maintenance and will fit any pull-start assembly that accepts the same washer profile as OS Starter Systems. The item is provided as a single replacement washer for repair and servicing.

Fitting is manageable for most hobbyists: remove the starter housing, keep the pulley and spacer order in sequence, swap in the new washer, and reassemble with original preload and alignment. Standard hobby drivers and pliers are usually enough; handle small circlips and springs with care to avoid loss.

Durability note: inspect the washer during regular service intervals and replace when flattened or worn to maintain starter engagement and reduce the risk of slippage or misalignment during operation.