Description
Ski-Doo Formula Plus 520 owners know that belt durability directly impacts acceleration response and overall reliability in demanding conditions. The Ultimax Pro Drive Belt 138-4400U4 delivers consistent clutch engagement across the entire RPM range while running cooler than OEM alternatives, reducing premature wear and extending service intervals. If you’re pushing your sled hard, this belt’s thicker cross-section and advanced cog design pay for themselves through improved performance and longevity.
- Thicker cross-section design
- Enhanced clutch engagement
- Advanced heat-dissipating cogs
- Reduced slippage across speeds
- Quicker acceleration response
- Extended belt life
- Cooler operating temperatures
- Top-cog efficiency design
- Fits Ski-Doo Formula Plus 520 (1989–1990)
- MPN: 138-4400U4
- Bolt-on installation
