{"product_id":"polini-torque-spring-for-yamaha-zuma-50-146-83","title":"Polini Performance Torque Spring: Yamaha Zuma 50","description":"\u003cp\u003eEliminate mid-range transmission lag and prevent belt slippage with the premium \u003cstrong\u003ePolini Performance Clutch Torque Spring\u003c\/strong\u003e. Engineered and manufactured in Italy by the tuning legends at Polini, this counter-pressure spring runs exactly 15% stiffer than your stock factory unit. By applying precise, constant lateral pressure against the rear pulley sheaves, it keeps your drive belt loaded tightly within the optimal powerband—maximizing out-of-the-hole acceleration and sharpening throttle response during heavy corner exits or hill climbs.\u003c\/p\u003e\u003ch3\u003eAdvanced CVT Tuning Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e15% Stiffer Compression Rate:\u003c\/strong\u003e Perfectly calibrated to raise your shifting RPM just enough to bypass factory flat spots, keeping your 50cc engine pinned squarely inside its peak power band.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Italian Craftsmanship:\u003c\/strong\u003e Wound from high-tensile, heat-treated silicon-steel alloy that resists spring sag, mechanical binding, and thermal fatigue under prolonged high-RPM stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResponsive Back-Shifting:\u003c\/strong\u003e Drastically improves back-shift response when decelerating, delivering immediate engine engagement the millisecond you snap the throttle back open.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Fitment Guide\u003c\/h3\u003e\u003cp\u003eThis performance spring features universal compatibility across \u003cstrong\u003eYamaha-based and Minarelli-clone 50cc\u003c\/strong\u003e scooter drivetrains:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003eMake \/ Manufacturer\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eModel Family Compatibility\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eEngine \u0026amp; Platform Architecture\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYamaha\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZuma 50 \/ Zuma 50cc 2T\u003c\/td\u003e\n\u003ctd\u003e2-Stroke (Horizontal \u0026amp; Vertical Minarelli Blocks)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYamaha\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZuma 50F \/ 50FX \/ C3 \/ Vino\u003c\/td\u003e\n\u003ctd\u003e50cc 4-Stroke (Liquid-Cooled 3-Valve Layouts)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYamaha\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJog 50 \/ Jog RR\u003c\/td\u003e\n\u003ctd\u003e50cc 2-Stroke Air \u0026amp; Liquid Cooled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGenuine Scooter Co.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuddy 50 \/ RoughHouse 50 \/ Rattler 50\u003c\/td\u003e\n\u003ctd\u003e50cc 2-Stroke (Minarelli Horizontal Clone)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAprilia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eScarabeo 50 2T \/ SR 50 (Minarelli)\u003c\/td\u003e\n\u003ctd\u003e50cc 2-Stroke Minarelli Engine Baselines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAdly \/ Keeway \/ Eton\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBeamer, Matrix, F-Act, Hurricane, Viper 50\u003c\/td\u003e\n\u003ctd\u003e50cc 2-Stroke (40QMB \/ Minarelli Clones)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Rate Resistance:\u003c\/strong\u003e +15% Tension Increase Over OEM Stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Composition:\u003c\/strong\u003e High-Tensile Silicon-Steel Alloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor Classification:\u003c\/strong\u003e Blue Tension Metric\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Italy (IT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 243.093 \/ 146-83\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003eTuning Note:\u003c\/strong\u003e Installing a stiffer torque spring alters your CVT balancing. If your transmission stays in a \"low gear\" ratio too long or over-revs, you may need to increase your roller weight mass slightly to perfectly counterbalance the new spring rate.\u003c\/blockquote\u003e\u003cblockquote\u003e\n\u003cstrong\u003eInstallation Tip:\u003c\/strong\u003e The rear clutch pulley assembly is under heavy internal mechanical tension! Always use a dedicated clutch compressor tool when loosening the large retaining nut to prevent parts from flying off your workbench.\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/blockquote\u003e\u003chr\u003e\u003ch3\u003eAbout Polini\u003c\/h3\u003e\u003cp\u003eFounded in 1950 in Alzano Lombardo, Italy, Polini Motori has spent over 70 years engineering high-performance components for small-displacement engines. From racing carburetors to CVT tuning kits, Polini parts are trusted by mechanics and enthusiasts worldwide for their precision manufacturing and consistent quality.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e 146-83  |  \u003cstrong\u003eVendor:\u003c\/strong\u003e Polini  |  \u003cstrong\u003eCategory:\u003c\/strong\u003e CVT Springs \u0026amp; Transmission\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.p65warnings.ca.gov\" target=\"_blank\"\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/a\u003e\u003c\/p\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":49985992130840,"sku":"146-83","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/727677.jpg?v=1744827444","url":"https:\/\/www.scooterworks.com\/products\/polini-torque-spring-for-yamaha-zuma-50-146-83","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}