{"product_id":"rdln-high-speed-gear-set-17-49-gy6-50cc-139qmb","title":"RDLN High-Speed Gear Set (17\/49) – GY6 50cc \/ 139QMB","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eIs your 50cc 139QMB engine revving at its limit without a higher top speed? The \u003cstrong\u003eRDLN 17\/49 Performance Gear Set\u003c\/strong\u003e changes your final drive ratio from the stock 3.41–3.71 down to \u003cstrong\u003e2.88\u003c\/strong\u003e, allowing your engine to push the bike faster at lower RPMs. Depending on your engine mods and rider weight, this gear set can net up to \u003cstrong\u003e7+ MPH of top-end gain\u003c\/strong\u003e. It's also the essential final step for scooters running 72cc, 80cc, or 100cc big bore kits — eliminating the over-revving that comes with stock gearing on a bored engine.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.88 Final Drive Ratio:\u003c\/strong\u003e Down from stock 3.41–3.71 — up to 7+ MPH top-end gain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdeal Big Bore Pairing:\u003c\/strong\u003e Eliminates over-revving on 72cc, 80cc, and 100cc kits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForged and Hardened Steel:\u003c\/strong\u003e Precision-cut to withstand increased torque of performance engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced Configuration:\u003c\/strong\u003e 17\/49 delivers the best acceleration-to-top-speed balance for the QMB139 platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduces Cruising RPMs:\u003c\/strong\u003e Improves fuel economy and long-term engine wear at speed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 1200-1283\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTeeth Count:\u003c\/strong\u003e 17T pinion \/ 49T large gear\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal Drive Ratio:\u003c\/strong\u003e 2.88\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 540g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Forged hardened steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Requires hydraulic press\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eFits \u003cstrong\u003e139QMB \/ 1P39QMB\u003c\/strong\u003e engine cases found in nearly all 50cc 4-stroke Chinese scooters, including engines coded:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eCategory\u003c\/th\u003e\n\u003cth\u003eEngine Codes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard GY6 50\u003c\/td\u003e\n\u003ctd\u003e139QMA, 139QMB, 1P39QMB, 1P39QMA-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtended Codes\u003c\/td\u003e\n\u003ctd\u003eYN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePopular Brands\u003c\/td\u003e\n\u003ctd\u003eTaoTao, Wolf, Bintelli, Ice Bear, Kymco (select 4T), SYM, Lance, and more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cem\u003e\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e This is not a drop-in part. A \u003cstrong\u003ehydraulic press is required\u003c\/strong\u003e to remove old gears from the secondary shaft and press the RDLN gears on. Professional installation is strongly recommended.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eVideos\u003c\/h2\u003e\u003cdiv class=\"az-content-videos\"\u003e\u003cdiv class=\"az-content-video\"\u003e\n\u003cvideo controls playsinline preload=\"none\" aria-label=\"RDLN High-Speed Gear Set (17\/49) – GY6 50cc \/ 139QMB — product video\"\u003e\u003csource src=\"https:\/\/cdn.shopify.com\/videos\/c\/vp\/9ae22d82562e49d685a254057596a224\/9ae22d82562e49d685a254057596a224.HD-1080p-4.8Mbps-98774562.mp4\" type=\"video\/mp4\"\u003e\u003c\/video\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/videos\/c\/vp\/9ae22d82562e49d685a254057596a224\/9ae22d82562e49d685a254057596a224.HD-1080p-4.8Mbps-98774562.mp4\"\u003eRDLN High-Speed Gear Set (17\/49) – GY6 50cc \/ 139QMB — product video\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e","brand":"RDLN","offers":[{"title":"Default Title","offer_id":67964727427393,"sku":"1200-1283","price":28.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/1200-1283_b22b6239-fde1-471b-a605-b57723dfbe47.webp?v=1792993060","url":"https:\/\/azscooterparts.com\/products\/rdln-high-speed-gear-set-17-49-gy6-50cc-139qmb","provider":"AZScooterParts","version":"1.0","type":"link"}