S-Drive variator kit suit Chinese 4 stroke 50

This S-Drive kit replaces the standard variator parts to improve top end acceleration, and raise the top speed. Only those parts that have been designed to our strict tolerances and specs get the Scootling name - this pulley kits gets great performance, especially at the top end. This transmission kit will improve mid-range acceleration, hill climbing and raise top speed even on electronically restricted models! Machined from quality aluminium alloy, includes: - pulley - ramp plate - sliders - weight rollers - stiffer clutch wiener springs for a complete revision of your transmission! The included springs are optional and raise the meet point of the clutch by approx 1,000RPM. To suit Chinese 4 stroke 50cc models (QMB139 / 139QMB engines). This means practically all of them made since 2006. Makes may include: Ciclone, Meiduo, Fada, Sunny, JM Star, Meteor, 50QT, YYQT50, Huawin, Motostar, Baotian, Boatian, Solana, Sunny, Arrow, Fierce, Forza, "Factory Built", Wolfboy, Qingqi, Kinroad, Lifan, Pioneer, TNT etc also other generic brands registered as "Moped" etc. This has to be the best bolt on mod for your money. Note that due to variations in specifications among Chinese manufacturers, the included clutch springs sometimes can not be used, and further roller tuning can be required in some cases.