{"product_id":"polini-performance-torque-spring-2-stroke-50cc","title":"Polini Performance Torque Spring - 2 Stroke 50cc","description":"\u003cp\u003ePolini performance CVT torque spring for the Yamaha Zuma 50 and Minarelli-based 50cc scooters. Runs 15% stiffer than stock, applying constant lateral pressure against the rear pulley sheaves to keep the drive belt loaded within the optimal powerband. Eliminates mid-range transmission lag, sharpens throttle response, and improves back-shift response on deceleration. Made in Italy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOff-road use only.\u003c\/strong\u003e Not intended for use on public roads or land.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTuning note:\u003c\/strong\u003e A stiffer torque spring alters CVT balance. If the transmission stays in a low ratio too long or over-revs, increase roller weight slightly to counterbalance the new spring rate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation tip:\u003c\/strong\u003e The rear clutch pulley is under heavy internal tension. Always use a dedicated clutch compressor tool when loosening the retaining nut.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e15% stiffer than stock — raises shift RPM to bypass factory flat spots\u003c\/li\u003e\n\u003cli\u003eHigh-tensile silicon-steel alloy — resists spring sag and thermal fatigue\u003c\/li\u003e\n\u003cli\u003eImproves back-shift response on deceleration\u003c\/li\u003e\n\u003cli\u003eMade in Italy by Polini\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpring Rate\u003c\/th\u003e\n\u003ctd\u003e+15% over OEM stock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eHigh-tensile silicon-steel alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMPN\u003c\/th\u003e\n\u003ctd\u003e243.093\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003ePolini\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eMade in Italy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eYamaha\u003c\/th\u003e\n\u003ctd\u003eZuma 50 2T, Zuma 50F \/ 50FX \/ C3 \/ Vino 4T, Jog 50 \/ Jog RR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGenuine Scooter Co.\u003c\/th\u003e\n\u003ctd\u003eBuddy 50, RoughHouse 50, Rattler 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAprilia\u003c\/th\u003e\n\u003ctd\u003eScarabeo 50 2T, SR 50 (Minarelli)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdly \/ Keeway \/ Eton\u003c\/th\u003e\n\u003ctd\u003eBeamer, Matrix, F-Act, Hurricane, Viper 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964657336641,"sku":"146-83","price":20.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-15084-0-146-83.main.01.default.jpg?v=1792558757","url":"https:\/\/azscooterparts.com\/products\/polini-performance-torque-spring-2-stroke-50cc","provider":"AZScooterParts","version":"1.0","type":"link"}