{"product_id":"adjustable-sheave-rear-clutch-pulley-50cc-139qmb-gy6-50cc","title":"Adjustable Sheave Rear Clutch Pulley - 50cc (139QMB) GY6 50cc","description":"\u003ch2\u003eAdjustable Sheave Rear Clutch Pulley for 50cc GY6 Engines\u003c\/h2\u003e\u003cp\u003eThis rear clutch pulley with an adjustable sheave is built for 50cc GY6 engines, with the 139QMB model as the main target. It plays an important role in how your scooter performs. It is one of the \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e that can noticeably improve acceleration and top speed. It also helps manage torque, which makes it a good choice for off-road use.\u003c\/p\u003e\u003ch3\u003eTorque Control and Acceleration\u003c\/h3\u003e\u003cp\u003eThe clutch seat has an outer diameter of 118mm, so it sits securely on the engine. A pulley needle bearing (HK172518RS) and a torque driver bearing (6901RS, 12mm inner diameter) are included. The ramp grooves are split into three straight grooves for quicker starts and three curved grooves for reaching higher speeds.\u003c\/p\u003e\u003ch3\u003eWhat Comes in the Box\u003c\/h3\u003e\u003cp\u003eThe package contains the full sheave assembly, a torque driver collar, an adapter bushing, and a hex nut, so you have everything needed to fit it. Use the correct tools and follow standard installation steps to get the best results.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Seat Outer Diameter:\u003c\/strong\u003e 118mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulley Needle Bearing:\u003c\/strong\u003e HK172518RS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTorque Driver Bearing:\u003c\/strong\u003e 6901RS (12mm inner diameter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRamp Grooves:\u003c\/strong\u003e 6 total (3 straight + 3 curved)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Sheave assembly, torque driver collar, adapter bushing, hex nut\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 50cc engines (139QMB and related QMA\/QMB codes) and 50-100cc GY6 engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eCompatible with:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 139QMB 50cc engine\u003c\/li\u003e\n\u003cli\u003eGY6 139QMA, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB and 147QMD engines\u003c\/li\u003e\n\u003cli\u003eOther GY6 50-100cc engines with QM or FM in the engine code\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Compare your engine code with the list above. A 50-100cc engine code that contains \"QM\" or \"FM\" is likely to be compatible.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc Scooter Parts (139QMB)\u003c\/a\u003e · \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 Scooter Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-variators-rollers\"\u003eScooter Variators \u0026amp; Roller Weights\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-clutches\"\u003eScooter Clutches \u0026amp; Clutch Springs\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51135947767865,"sku":"TT-17124","price":35.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/rdln-adjustable-sheave-rear-clutch-pulley-50cc-139qmb-gy6-50cc-1.webp?v=1794350488","url":"https:\/\/www.trendtimes.com\/products\/adjustable-sheave-rear-clutch-pulley-50cc-139qmb-gy6-50cc","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}