Hammerhead Gear, 13T Counter Shaft Gear for 150cc, GY6 - M150-1043000 replaces 164-131

13 tooth count on smaller gear.  

Counter Shaft Gear for 150cc and 125cc GY6 4-stroke QMI152/157 QMJ152/157 engines.

• 42 teeth on large gear
• 13 teeth on small gear
• 15mm shaft

This is used only for engines with the external reverse gearbox, and typically used in Hammerhead 150cc engines manufactured before 2005.  This gear is still used in many scooter engines still produced.

Hammerhead part #M150-1043000