Pay in 4 interest-free payments of $2.75 Learn more
Ships within 48 hours · Estimated delivery Sep 20 - Sep 25
Includes in-tank filter and fuel lines
Belt Size: 977-23
Vee Rubber's 3/3
Outer Diameter: 139mm
Compatibility: Models below and bikes with 2T horizontal Minarelli engines
Universal Parts CVT Torque Spring | 139QMB 50cc venture rack Includes in-tank filter and fuelRestore proper CVT engagement and shift behavior on your 50cc scooter with this Universal Parts replacement torque spring for 139QMB 4 stroke engines. The torque spring sits inside the rear driven pulley (clutch side) of the CVT and controls the rate at which the belt rides up the pulley faces as engine load increases. A worn or fatigued spring causes sluggish acceleration, belt slip, and poor top speed engagement replacing it restores factory CVT
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