Description
A worn mainshaft bearing doesn’t just compromise power delivery—it introduces play that cascades through your entire drivetrain, accelerating wear on adjacent components and unpredictably altering shift quality. The EASTERN MOTORCYCLE PARTS Bearing A-8990 is a direct OEM replacement engineered to restore precise mainshaft alignment and eliminate the slack that throttle response and cornering depend on. If your 5-speed Big Twin transmission is notching into gears with hesitation or you’re hearing grinding under load, this bearing is your first diagnostic stop.
- Fitment: 5-speed Big Twin
- OEM replacement mainshaft bearing
- MPN: A-8990
- Bolt-on installation
- Restores drivetrain precision
- Eliminates mainshaft play
- Factory-engineered tolerances
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