QMB139 Naraku Scooter Performance Half Pulley Naraku HS-CNC V.2 for GY6, Kymco 50cc 139QMB scooter engines
V.2 is the latest version of the CNC-machined pulley from NARAKU. This enhanced version now allows you to mount the original variator fan wheel and carrier star him. (Fig. 2), the edge angle was revised again and combines a little more top speed with sufficient power. The CNC-machined running surface of the disc allows for a clean, low-vibration belt operation.
Unlike CNC machined pulleys for other types of engines, the HS CNC has teeth for the electric starter. This can be reused, saving tedious “clicking”. The toothing does however make the pulley more expensive. The original fan and carrier sprocket can still be used, but are not included. If required, please order separately.
This Naraku Performance Scooter parts upgrade is meant for 50cc scooters with the GY6 50 engines also listed as 139QMB, QMB139, 1P39QMB, QMA139.
Click on application tab and check to make sure you have a GY6 4stroke 50cc style engine before ordering.
We strongly recommend this item for all your QMB139 upgrades.