TBparts Z125 Lightweight Primary Gear
Our Primary Gear replaces the OEM gear and removes close to 2lbs of weight. This reduces the load and amount of rotating mass on the crankshaft which improves the throttle response. Just swap out and your new Z125 will rev faster with this affordable performance item!
OEM Primary Gear weight: 2 lb 6.2 oz
Our Primary Gear weight: 7.3 oz