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Bel-Ray Total Performance Lubricants. Unleash Your Bike’s Potential.

Experience increased engine power, smoother shifting & maximize chain and sprocket life.

Bel-Ray reduces friction, extends component life and keeps your engine running cleaner.

When performance and longevity matter, Flex Your Engine.

Trusted for GeneRAYtions

For over 75 years, Bel-Ray has been a global leader in developing high-performance lubricants that stand up to the toughest conditions.

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Thumper® Racing Synthetic Ester Blend 4T Engine Oil

Bel-Ray Thumper Racing Synthetic Ester Blend 4T Engine Oil is a 4-stroke motorcycle racing oil that combines the finest quality synthetic esters and highly-refined mineral base oils specifically engineered for today’s 4-stroke single cylinder, multi-valve racing engines. Provides maximum anti-wear protection for valve-trains, rings, cylinders and pistons. Delivers maximum horsepower while providing consistent clutch performance. Meets API SN and JASO MA2 requirements. Suitable for air-cooled/liquid-cooled 4-stroke engines and wet clutches.

V-Twin Synthetic Engine Oil

V-Twin Synthetic Engine Oil is a multi-grade synthetic motorcycle oil formulated to meet the specific demands of large displacement V-Twin engines. It combines the benefits of fully-synthetic base oils with high performance additives.

Foam Filter Oil

Bel-Ray Foam Filter Oil is a foam air filter oil for all street, off-road, and racing foam air filter applications. Innovative Bel-Ray technology has produced a foam filter oil unlike any other. It is easy to apply and improves airflow. Ultra-viscous formula forms an oil barrier to trap micron-sized particles that can cause engine damage.

Lubricant selector

Not sure which product is right for you? Visit our lubricant selector to find our what we recommend for your machine.

Understanding
Oil Viscosity

Oil viscosity refers to how easily oil flows at a specified temperature. Thinner oils flow more easily at low temperatures than heavier, thicker oils that have a more honey-like consistency. Thin is better for easier cold weather starting and reducing friction, while thick is better for maintaining film strength and oil pressure at high temperatures and loads.

Oil viscosity is measured and given a number, which some people also refer to as the “weight” (thickness) of the oil. The lower the viscosity rating or weight, the thinner the oil. The higher the viscosity rating, the thicker the oil.

Motor Oil Viscosity Ratings

Viscosity ratings for commonly used motor oils typically range from O up to 50.

  • With multi-viscosity oils, a “W” after the number stands for “Winter” grade oil
  • The numeric value of the first number (example 5W-20) is a reference point to the lowest applicable temperature
  • The SAE grade is a reference point to the oil viscosity at operating temperatures

Engine Oil Ratings Reference Guide

API (American Petroleum Institute)

Test engine oil for performance, protection and cleanliness

Does not relate to clutch or transmission performance

FIRST LETTER

“S” for Service
(Gasoline Engine Applications)

“C” for Commercial
(Diesel Engine Applications)

Second LETTER

The Rating

  • Further down the alphabet = higher ratings
  • J is currently most manufacturer’s minimum
  • Ratings test for: wear resistance, oxidation, corrosion resistance, deposit control and more
  • Oil must pass all tests to obtain rating

JASO

(JAPANESE AUTOMOTIVE STANDARDS ORGANIZATION)

MA: MINIMUM REQUIRED FOR ENGINES THAT SHARE ITS OIL WITH TRANSMISSION AND CLUTCH

  • Allows enough friction between your clutch plates for proper operation

MA2: Highest rating (higher amount of friction within the clutch)

  • Consistent clutch feel even at high operating temperatures
  • MA2 advantages: less wear over time and low clutch slip giving your motor more horsepower and torque

MB: Not suitable for transmission and wet clutch

  • JASO MB rating for non-wet clutch motorcycle engines

Most of the Bel-Ray 4-Stroke Powersports line meets or exceeds the API SN standards and are JASO MA2 registered.

The few products that don’t meet those standards were formulated to meet specific criteria within the applications for which those products were created. (Example: Bel-Ray Friction Modified Thumper Oil API SN JASO MB was designed for dirt bike engines that used separate oils for the engine and transmission.)

Street, ATV, UTV, V-TWIN, Off-road, & Service Lines of oils, lubes, greases, & fluids

The PowerSports Catalog