High quality air cutoff valve kit for GL1100 '80-'83 that includes parts necessary for a complete rebuild of the valve (diaphragm, spring and O-ring) so as to improve starting, warm up, idling and acceleration. Read FAQ4. To further insure against any additional vacuum loss, replace your inexpensive carburetor manifold o-rings, 18-4610. Note: The GL1000 and GL1200 require one air cutoff valve kit but the GL1100 requires four air cutoff valve kits. This price is for a single kit. Click for Installation.