Variator Drive Wheel Assembly for GY6 QMB139 50cc 4-stroke engines Kit Includes: Variator Pulley (Retainer), 7gr Rollers, Drive Face Spacer, Cooling Fan, Kick starter ratchet gear, Drive Face Gear, Variator Back Plate with sliders Fits many 50cc 4- stroke engines, Jonway VIP Lance Kymco Baccio TaoTao Tank Peace gas scooters Fit Most brand models, like AVANTI, BAJA, BAOTIAN, BMS, BMX, DIAMO, EAGLE, FUSHIN, ICE BEAR,JACKEL, MOTO, JM STAR, JONWAY, KAZUMA, KEEWAY, KYMCO, MOTOFINO,PANTHER, REDCAT, ROKETA, SCHWINN, STRADA, SUNL, TANK, TAO TAO,TERMINATOR, VENTO, VERUCCI, WILDFIRE, X-TREME, YAMATI, AND MANY MORE Roller weight: 8.5 gram, Advanced material solid structure high strength and long life span Brand new primary clutch variator assembly for 50cc 4 Stroke Scooters ATV, Go Kart Complete Variator assembly as shown in the picture includes: Unrestricted drive boss / slide bushing Primary Drive face movable pulley 6 x Roller weights Ramp plate with 3 x glide keys Sta