Re: Fuel shutoff
Your local Ace Hardware, Grainger and other hardware outlets. The threads will be 1/8" NPT (national pipe thread) but with the help of a tap the threads in your tank can be made to accept it. Just don't run the tap in too deep; just far enough to get the new valve started a few threads.
Sick Bike Parts and a few other sponsors here also sells them. Check their ads.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"