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http://www.belray.com/lubricant_advisor
Bel-Ray Thumper 4-Stroke Racing Motor Oil is specifically engineered to meet the demands of single cylinder, multi-valve 4-stroke racing engines. The high temperatures and severe loads of racing require the exceptional film strength, shear- and temperature stability of Bel-Ray Thumper 4-Stroke Racing Motor Oil. Synthetic blend for racing engines Maximum horsepower and consistent clutch performance Wear protection for valve-trains, rings, cylinders and pistons For air-cooled / liquid-cooled 4T engines with wet clutches.
An innovative entrepreneur and chemical engineer, William (Bill) Kiefer started the company in his family’s suburban New Jersey (USA) garage, specializing in high temperature bakery lubricants. Bel-Ray’s first product was a specialty lubricant manufactured for Nabisco for use in high-temperature bakery ovens. This launched the company’s Industrial Division. The company’s goal: to provide industrial customers with new, inventive products that offered optimum performance and measurable value.