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Bel-Ray Thumper Racing Friction Modified 4T Engine Oil

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Bel Ray Thumper Racing Friction Modified 4T Motor Oil

Bel Ray Thumper Racing Friction Modified 4T Motor Oil is a 4-stroke motorcycle racing oil formulated specifically for motorcycle applications using separate engines and transmissions. Friction modifiers reduce engine temperature, increase horsepower and extend engine life. Suitable for air-cooled/liquid-cooled 4-stroke engines.


  • Reduced cylinder and ring wear
  • Controls sludge and varnish formation
  • Keeps ring lands and grooves free of carbon build-up
  • Shear stabilizer provides superior lubrication and film strength
  • Reduced energy to turn the engine means more power to the rear tire

Note: Do NOT use in wet clutch apllications.

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Product Style Item # Store SKU Manufacturer Product # Availability
10W30 / 1 Liter 775950 99210-B1LW In Stock: Ships within 24 hours
10W40 / 1 Liter 775951 99220-B1LW Out of Stock