{"product_id":"mfc-passion-racing-scooter-variator-kit-for-gy6-50-100cc-red-front-clutch-with-5g-7g-9g-rollers-durable-metal","title":"MFC·passion Racing Scooter Variator Kit for GY6 50-100cc — Red Front Clutch with 5g\/7g\/9g Rollers, Durable Metal","description":"\u003cp\u003e\u003cstrong\u003eMFC·passion Racing Scooter Variator Kit is a complete front clutch variator assembly with interchangeable 5g, 7g and 9g rollers designed to upgrade performance and tune acceleration for GY6 50cc–100cc 4-stroke engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis red variator assembly is built to fit the common GY6 family—models 139QMB and 139QMA—used in many Chinese scooters, mopeds, ATVs, quads and go-karts. Made from durable metal and supplied with three sets of rollers (3×5g, 3×7g, 3×9g), it gives you flexible gearing and a direct replacement for worn or stock parts. The kit’s dimensions and boss bush match industry standards to simplify installation on compatible engines from brands like Lifan, Loncin, Zongshen and Taotao.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this variator kit affect acceleration and top speed?\u003c\/h3\u003e\n\u003cp\u003eChanging roller weights shifts the CVT engagement profile: lighter rollers let the engine rev higher for quicker acceleration, while heavier rollers favor lower RPMs and a higher theoretical top speed. This kit includes 5g, 7g and 9g rollers so you can test multiple setups and find the balance that suits your riding style.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e5g rollers: quicker clutch engagement, sharper initial acceleration\u003c\/li\u003e\n  \u003cli\u003e7g rollers: balanced response for mixed use\u003c\/li\u003e\n  \u003cli\u003e9g rollers: smoother pull, potential for higher cruising speed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this variator assembly fit my scooter or ATV?\u003c\/h3\u003e\n\u003cp\u003eThe assembly is sized to fit GY6 50cc, 80cc and 100cc 4-stroke engines identified as 139QMB\/139QMA. Check the variator O.D., I.D. and boss bush dimensions against your current part to confirm compatibility. It’s a common fit for many Chinese-made engine platforms.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVariator outer diameter: 90mm (3.54\")\u003c\/li\u003e\n  \u003cli\u003eInner diameter and boss bush: 20mm I.D.; boss 20×38mm\u003c\/li\u003e\n  \u003cli\u003eRoller dimensions: 16×13mm with 5g, 7g, 9g weights included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and build quality should I expect?\u003c\/h3\u003e\n\u003cp\u003eThis variator assembly is manufactured from high-quality metal for improved wear resistance compared with lower-grade castings. The rollers are precision cut to consistent weight values so tuning results are repeatable. That makes the kit suitable for routine commuting or performance-focused tweaks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurable metal variator housing for longevity\u003c\/li\u003e\n  \u003cli\u003eConsistent, factory-weighted rollers for accurate tuning\u003c\/li\u003e\n  \u003cli\u003eRed finish for corrosion resistance and easy visual inspection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is the kit to install and what’s included?\u003c\/h3\u003e\n\u003cp\u003eInstallation follows standard variator replacement steps and requires basic tools: puller for the variator if needed, socket set and torque wrench. The package contains a full variator assembly and three sets of three rollers (3×5g, 3×7g, 3×9g), ready to drop into models that match the dimensions listed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncluded: 1 complete variator assembly\u003c\/li\u003e\n  \u003cli\u003eRoller sets: three each of 5g, 7g and 9g (total 9 rollers)\u003c\/li\u003e\n  \u003cli\u003eCompatible with many GY6-based scooters and small ATVs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This MFC·passion Racing Scooter Variator Kit is ideal for riders who maintain or upgrade Chinese GY6-based scooters, small ATVs and go-karts—mechanically inclined DIYers, scooter tuners and small repair shops. Choose this kit if you want a direct-fit replacement with the flexibility to test roller weights for improved throttle response and ride feel without complex modifications.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this variator fit GY6 139QMB and 139QMA engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit is sized for GY6 50–100cc 139QMB and 139QMA engines with a 20mm I.D. and 90mm outer variator.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which roller weight should I start with for daily commuting?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Begin with the 7g rollers for a balanced mix of acceleration and cruising efficiency, then adjust up or down if needed.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"MFC·passion","offers":[{"title":"Default Title","offer_id":48084885078174,"sku":"B0D46Z26N8","price":37.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/mfcpassion-variator-front-assembly.jpg?v=1785865156","url":"https:\/\/northtrailauto.ca\/products\/mfc-passion-racing-scooter-variator-kit-for-gy6-50-100cc-red-front-clutch-with-5g-7g-9g-rollers-durable-metal","provider":"North Trail Auto","version":"1.0","type":"link"}