{"product_id":"gy6-50cc-139qmb-racing-clutch-kit-with-adjustable-sheave-pulley","title":"GY6 50cc (139QMB) Racing Clutch Kit with Adjustable Sheave Pulley","description":"\u003ch2\u003eRacing Clutch Kit with Adjustable Sheave Pulley for GY6 50cc Engines\u003c\/h2\u003e\u003cp\u003eThis racing clutch set is built for GY6 50cc engines, with a focus on the 139QMB models. It takes the place of the stock clutch and provides fast engagement along with adjustable acceleration tuning. Among the \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e we carry, this kit is aimed at riders who want more off-road performance from their scooter.\u003c\/p\u003e\u003ch3\u003ePerformance Components\u003c\/h3\u003e\u003cp\u003eThe package includes a complete clutch shoe assembly with tough, high-friction plates and springs that begin engaging at 1500rpm. The clutch bell is anodized red and has tapered vents and a splined center bore to help it run efficiently. The adjustable sheave pulley uses six grooves, so you can choose between quicker acceleration and a higher top speed.\u003c\/p\u003e\u003ch3\u003eHeat Management Design\u003c\/h3\u003e\u003cp\u003eBecause this kit is meant for hard riding, the outer drive face of the clutch bell has perforated holes and angled vents. Together these help shed heat during demanding use, which supports dependable operation over time. It suits riders who regularly take their scooters to their limits.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Spring Tension:\u003c\/strong\u003e 1500rpm engagement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Bell Inner Diameter:\u003c\/strong\u003e 107mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Bell Outer Diameter:\u003c\/strong\u003e 117mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Bell Splines:\u003c\/strong\u003e 22 splines, 11.2mm inner diameter (peak to peak)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Shoe Inner Diameter:\u003c\/strong\u003e 24mm (flat to flat) \/ 28mm (round to round)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Shoe Outer Diameter:\u003c\/strong\u003e 105mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Shoe Height:\u003c\/strong\u003e 30mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSheave Outer Diameter:\u003c\/strong\u003e 118mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSheave Ramp Grooves:\u003c\/strong\u003e 6 total — 3 straight (quick takeoff) + 3 curved (top speed)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Clutch shoe assembly, vented clutch bell\/drum, adjustable sheave pulley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 50cc engines with 139QMB-based engine codes (139QMA, 139QMB, 1P39QMB, 147QMD and other QMA\/QMB variants)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\u003cli\u003eGY6 50cc engines (139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD and other QMA\/QMB variants)\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Look for the engine code stamped on your motor. If it matches a 139QMB-based code such as 139QMB, 1P39QMB or 147QMD, this kit is listed for it. The seller describes 'QM' or 'FM' codes as likely 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":51135929024569,"sku":"TT-16874","price":65.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/rdln-racing-clutch-kit-w-adjustable-sheave-pulley-for-gy6-50cc-139qmb-1.webp?v=1794350178","url":"https:\/\/www.trendtimes.com\/products\/gy6-50cc-139qmb-racing-clutch-kit-with-adjustable-sheave-pulley","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}