N-MP-03621 and ZTRQMB139 Spring Upgrades for 139QMB

N-MP-03621 and ZTRQMB139 Spring Upgrades for 139QMB available from MRP http://www.mrp-speed.com This engine is used on virtually all 49cc/50cc 4-stroke Chinese and Taiwanese scooters. Baja SC50, Strada RX 50, Jalon JL50QT-21, falcon and JL50QT-15, JL50QT-16,Strada RX 50, Jalon JL50QT-21 falcon, JL50QT-15, JL50QT-16, JL50QT-18, Pantera Freedom, Fusion and Retro, Verucci VC50TS-3M, Sunl SL50QT-16, SL50QT-16, SL50QT-18, SL50QT-2, SL50QT-3, Roketa Bahama, Maui, Sicily, Tank, Baotian 50QT-9, Baotian, 50QT-11, Dotera 50QT-11, Jalon JL50QT-18, Sinski XSJ50QT-6, Sinski XSJ50QT-B, Taishan Commuter, Taishan Sport Zhong Hu 50cc 4t and more! Many Kymco and SYM models also use this 4T engine. To find out more visit Martin Racing Performance and call one of our dealers to order the parts.