STIHL Flywheel Bushing - 0000 963 0809

The STIHL flywheel bushing (part number 0000 963 0809) restores critical rotor alignment and eliminates crankshaft drift caused by degraded bearing surfaces in two-stroke powerhead assemblies.

Key Features

• Precision-machined steel sleeve engineered to replace worn flightwheel bushings in STIHL chainsaw engines.
• Preserves accurate clearance between the flywheel and ignition coil, preventing voltage fluctuations and unstable idle conditions.
• Distributes radial load evenly across the crankshaft journal, reducing metal fatigue and seizure risk under maximum throttle.
• Manufactured to original equipment dimensional tolerances for direct installation without adapter fabrication or grinding.

Product Details

Part Number: 0000 963 0809 | Manufacturer: STIHL | Component Type: Flywheel Bushing / Rear Journal Bearing

This component functions as the stationary contact surface inside the rear flywheel housing. As rotational speeds increase under cutting load, the bushing must maintain concentricity to protect the magneto timing window and prevent uneven stator wear. Service procedures require cleaning of mating surfaces, visual inspection of the crankshaft journal for fretting or scoring, and simultaneous replacement of main shaft oil seals to restore internal lubrication pathways and exclude abrasive particulates.

Compatibility

• STIHL MS 170, MS 180
• STIHL MS 250, MS 251
• STIHL MS 270, MS 271
• STIHL MS 362
• Fits mid-production serial runs; verify rear flywheel mounting geometry and serial plate dates before purchase.