Originally Posted by PSchrauber
I hope this mechanism works (closes) well without any spring. When the spring is loosing tension it will get spitty around the deco in my experience, (This happend after a decade or so). They also have the tendency too loosen. I therefore check them once or twice a year if they still sit thight.
It closes too well, I needed to add the cable as light kicking was causing it to close before I wanted.
The valve is the standard Sthil type saw valve that is used in everything from chain saws to Harley Davidson V-twins. It has a detent that engages in the closed position to assist closing and keep it closed. This is the specific valve recommended by the Cr500 community.
Also the valves themselves are only $12, so if needed can be replaced (or spares kept) cheaply.