Yamaha Sprocket Oil Seal

The Yamaha Sprocket Oil Seal is a vital component that seals the output or sprocket shaft where it exits the crankcase or gearbox. The flexible rubber lip of the seal maintains contact with the rotating shaft, keeping engine or transmission oil contained while preventing leaks onto the sprocket, chain, or surrounding parts.

In addition to sealing oil, the dust lip helps block dirt, water, and debris from entering the shaft housing, protecting internal bearings and shaft surfaces from damage. Over time, exposure to heat, oil, and friction can cause the rubber lip to harden or crack, leading to leaks.

Replacing a worn or damaged sprocket oil seal restores reliable sealing, maintains proper lubrication, and keeps the drivetrain clean. Proper installation requires a smooth, clean shaft and careful press-fitting to avoid tilting or damage to the seal lip.

This oil seal is essential for maintaining engine health, preventing contamination, and ensuring the longevity of drivetrain components.