{"product_id":"qmb139-gear-up-kit-copy","title":"GY6 50cc Final Drive High Speed Gear Up Kit (Includes Pressed Gears, Gasket \u0026 Oil) - QMB139","description":"\u003cp style=\"font-size: 17px; line-height: 1.5;\"\u003eGet more top speed out of your 50cc QMB139 scooter. This gear-up kit swaps the stock gearbox gears for a taller final drive, so the engine turns fewer RPM at any given road speed. Everything you need for the swap is in the box. Pick your gears based on your engine displacement.\u003c\/p\u003e\n\u003c!-- FITMENT --\u003e\n\u003cdiv style=\"border: 1px solid #121212; padding: 18px 20px; border-radius: 0; margin: 20px 0;\"\u003e\n\u003cp style=\"font-size: 13px; font-weight: bold; text-transform: uppercase; letter-spacing: 0.04em; margin: 0 0 12px;\"\u003e🔍 Does this fit your bike?\u003c\/p\u003e\n\u003cul style=\"margin: 0; padding-left: 20px; font-size: 15px; line-height: 1.6;\"\u003e\n\u003cli\u003e\u003cstrong\u003eGY6 50cc scooters with the QMB139 (139QMB) engine.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for 150cc+ GY6 engines\u003c\/strong\u003e (QMI152 \/ QMJ157). Those need our \u003ca href=\"https:\/\/www.rollingwrenchdenver.com\/products\/gy6-gear-up-kit\"\u003e➡️ \u003cstrong\u003e150cc+ gear-up kit.\u003c\/strong\u003e ⬅️\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eReal-world top speed depends on your engine, CVT setup, rider weight and conditions, and the gains are smaller if the engine can't pull the gearing. Not sure what engine you have? Check the engine code stamped on the case.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- BEFORE YOU ORDER --\u003e\n\u003cdiv style=\"border: 1px solid #121212; padding: 18px 20px; border-radius: 0; margin: 20px 0;\"\u003e\n\u003cp style=\"font-size: 13px; font-weight: bold; text-transform: uppercase; letter-spacing: 0.04em; margin: 0 0 12px;\"\u003e⚠️ Before you order\u003c\/p\u003e\n\u003cul style=\"margin: 0; padding-left: 20px; font-size: 15px; line-height: 1.6;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpect some low-end loss.\u003c\/strong\u003e Taller gearing trades acceleration for top speed, and a 50cc engine has little torque to spare.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest on built engines.\u003c\/strong\u003e A stock motor will see less benefit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks best with a tuned CVT.\u003c\/strong\u003e Variator weights or sliders help the engine pull the taller gearing.\u003c\/li\u003e\n\u003cli\u003eInstall is easiest while you already have the CVT or gearbox cover off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo returns on performance parts.\u003c\/strong\u003e Double-check your engine and option before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- WHAT'S INCLUDED --\u003e\n\u003cdiv style=\"border: 1px solid #121212; padding: 18px 20px; border-radius: 0; margin: 20px 0;\"\u003e\n\u003cp style=\"font-size: 13px; font-weight: bold; text-transform: uppercase; letter-spacing: 0.04em; margin: 0 0 12px;\"\u003e✓ What's in the box\u003c\/p\u003e\n\u003cul style=\"margin: 0; padding-left: 20px; font-size: 15px; line-height: 1.6;\"\u003e\n\u003cli\u003eGear set (countershaft gear and final drive gear)\u003c\/li\u003e\n\u003cli\u003eGearbox gasket\u003c\/li\u003e\n\u003cli\u003eGear oil\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Rolling Wrench","offers":[{"title":"QMB139 70cc - 80cc Complete Kit (Pressed Gears, Gasket \u0026 Oil)","offer_id":67702647881957,"sku":null,"price":88.0,"currency_code":"USD","in_stock":true},{"title":"QMB139 90cc - 100cc Complete Kit (Pressed Gears, Gasket \u0026 Oil)","offer_id":67702647914725,"sku":null,"price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1415\/0180\/files\/ma1.png?v=1792014782","url":"https:\/\/www.rollingwrenchdenver.com\/products\/qmb139-gear-up-kit-copy","provider":"Rolling Wrench","version":"1.0","type":"link"}