Step 1 Choose your WS4 Track kit

Outside width: 140mm

Surface: brushed

XC-W125/150 17-21

It can be mounted with the mounting hole in front of the tubing if there are clearance issues or behind the tubing for a very clean installation

All Balls Racing - Air Cut off Valve Rebuild Kit (46-4041) K-Type-Open-Face Helmets Step 1 Choose your WS4Kit Includes all necessary parts to rebuild the air cut off valve circuit. Models with multiple carburetors include components to repair all carburetors. Kit includes necessary o rings, diaphragm, spring, screws. Improperly functioning air cut off valves can stick open or closed causing popping on deceleration or poor running conditions.