BSA 500 650 Mushroom Valve Adjuster SET a50 a65 made in USA BSA Memorabilia This kit has a normal

This kit has a normal upper bolt with large

It is not suitable for the street tanks which have a larger opening and cap

This listing is for the complete pair shown

06-0448 O-ring (x2)

This listing is for both the extractor and dummy shaft/shim locator

BSA 500 650 Mushroom Valve Adjuster SET a50 a65 made in USA BSA Memorabilia This kit has a normalSuitable for BSA unit twin engines. The only adjusters you should use in your vintage British machine, period. American made, Rockwell hardness 60, micro finished 'mushroom' head. These adjusters create a wide valve contact area, improving the sometimes dubious geometry of high performance British pushrod ohv engines. No more pitted valve stems.