Bel-Ray Thumper Racing Works Synthetic Ester 4T Engine Oil is a 4-stroke synthetic motorcycle racing oil that has been developed for full works competition use and is designed to withstand extreme racing conditions. Full synthetic ester base oils withstand the highest temperatures and stresses and provide the ultimate performance for 4-stroke motorcycles. Meets API SN and JASO MA2 requirements. Suitable for air-cooled/liquid-cooled 4-stroke engines and wet clutches.

• Synthetic Ester formula for the ultimate Thumper experience
• Maximum horsepower and consistent clutch performance
• Wear protection for valve-trains, rings, cylinders and pistons
• For single cylinder off-road motorcycles/ATV's
• API SN, Registered JASO MA2