NCY Adjustable Secondary Clutch Pulley - Jog / Zuma 50 cuppini A worn or out-of-true crankshaft

A worn or out-of-true crankshaft can cause severe crankcase damage

Includes screws

and brake switch for GY6 and 139QMB style scooters

Inner spring — ID: 12

Overall Dimensions: 22" L x 17

NCY Adjustable Secondary Clutch Pulley - Jog / Zuma 50 cuppini A worn or out-of-true crankshaftThe NCY Adjustable Secondary Sliding Sheave Clutch Pulley Assembly gives your Yamaha Zuma 50 or Jog a quicker takeoff and a higher top speed. With two sets of ramp angles one steeper, one more gradual you can tune engagement to suit your riding style: steeper for more power off the line, gradual for more power at speed. Key Features: Two interchangeable ramp angles for tunable clutch engagement Steeper ramp = faster takeoff; gradual ramp = higher top