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

Starter pulley washer compatible with OS starter systems

This Hirobo HI0404010 starter pulley washer is a replacement spacer intended for pull-start assemblies that reference OS Starter Systems, keeping correct axial spacing and steady engagement between pulley components.

The washer is commonly listed among spare parts for Hirobo Eagle, Freya, EX and SX helicopter maintenance and fits pull-start stacks that accept the same washer form factor as OS Starter Systems. It is supplied as a single replacement washer for repairs and routine servicing.

Installation is straightforward for hobby technicians familiar with pull-start disassembly: remove the starter housing, note pulley and spacer order, replace the worn washer, and reassemble while preserving original preload and alignment. No special tools beyond basic hobby drivers and pliers are required; take care to retain small circlips and springs.

Performance note: replacing a flattened or damaged washer helps restore reliable starter engagement, reducing slippage and misalignment in the pull-start mechanism for consistent starting on bench and in the field.