This bearing serves as a direct replacement component for the O.S. engine models named in the title. Supplied as a single unit, it supports rotating shafts in small glow or gas model engines and reduces friction between moving parts.
Compatibility covers the engine codes shown: R 25SF, 25FX, 32F, FS-26S, FS-30S, and FS-40S. Always verify bearing dimensions and fit before pressing a new unit into place to ensure correct seating and alignment.
Installation notes: use a bearing press or a soft-jaw vise to prevent damage to the race or rolling elements, keep mating surfaces clean, and avoid applying force to the inner race alone to prevent preload changes. When reassembling, check shaft runout and endplay to preserve predictable engine behaviour.
Role in tuning and maintenance: replacing a worn bearing restores smoother rotation and can reduce mechanical losses in the driveline, helping maintain consistent idle and throttle response; consider this routine maintenance rather than a performance upgrade.
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