{"product_id":"polini-up-gear-set-13-44-yamaha-zuma-minarelli-50","title":"Polini Up Gear Set 13\/44 | Yamaha Zuma \u0026 Minarelli 50","description":"Unleash higher top-end speeds and lower your cruising RPMs with the premium Polini Aftermarket 13x44 Up-Gear Set . Specially engineered for 50cc 2-stroke scooters utilizing a Minarelli-style engine architecture, this taller primary gear kit alters your final drive ratio to maximize the output of modified high-performance configurations. Key Features Taller Gearing: Features an optimized 13\/44 tooth count profile, providing an excellent up-gear ratio to significantly extend your machine's top-speed ceiling. Reduced Engine Over-Rev: Lowers overall engine RPMs when running at full throttle, conserving fuel and reducing engine wear. Premium Polini Engineering: Precision-machined from high-tensile hardened steel to withstand extreme transmission friction, high temperatures, and intense drivetrain stress. Vehicle \u0026amp; Engine Compatibility Matrix This up-gear set is built specifically for 2-stroke (2T) horizontal and vertical Minarelli engine configurations. Review verified model lines below: Brand Compatible Models (50cc 2-Stroke Minarelli Engines) Yamaha Zuma 50 (1997–2011 2T platforms), Jog 2T Aprilia SR50, Scarabeo 50 Malaguti F12 Phantom, F15 Firefox, Ciak 50 Benelli Pepe 50 HIGH-PERFORMANCE TUNING NOTICE: This product is an advanced taller gear modification. It is recommended for vehicles already upgraded with a 70cc big bore cylinder kit. A stock 50cc engine does not possess enough low-end horsepower to effectively pull a taller gear set, which will result in sluggish acceleration. Installation requires a 10x1.25mm nut (not included). Technical Specifications Gear Ratio Count: 13 \/ 44 Tooth Engine Type Match: Minarelli 50cc 2-Stroke Family Required Fastener Size: 10x1.25mm Nut (Sold Separately) Manufacturer Part Number (MPN): 202.1370 Vendor: Polini Motori California Prop 65 Warning: www.P65Warnings.ca.gov","brand":"polini","offers":[{"title":"Default Title","offer_id":48045239238843,"sku":"1200-1232","price":102.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1340\/6651\/files\/1200-1232_80fc4f0d-a623-40cb-9189-ec5bcfcd7ed0.jpg?v=1783054987","url":"https:\/\/thriftyscooters.com\/products\/polini-up-gear-set-13-44-yamaha-zuma-minarelli-50","provider":"Thrifty Scooters","version":"1.0","type":"link"}