This ball bearing is an RC-scale replacement part intended for use with the O.S. engine models listed in the product name. It is supplied as a single bearing element designed to support rotational shafts inside small glow or gas model engines and to reduce contact friction between moving components.
Compatibility is limited to the engine codes named: R 25SF, 25FX, 32F, FS-26S, FS-30S, and FS-40S. When servicing these engines, confirm the bearing size and fitment visually before pressing a new unit into place to ensure it seats correctly without misalignment.
Installation notes: use a proper bearing press or a soft-jaw vise to avoid damaging the race or rolling elements, keep mating surfaces clean, and avoid applying force to the inner race alone when installing to prevent preload changes. During reassembly, check shaft runout and endplay to maintain predictable engine behaviour.
Role in tuning and maintenance: replacing a worn bearing restores smoother rotation and can lower mechanical losses in the driveline, which helps maintain consistent idle and throttle response on RC engines; treat this as routine maintenance rather than a performance upgrade.
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