BSA 500 650 Mushroom Valve Adjuster SET a50 a65 made in USA BSA Memorabilia 06-0448 O-ring (x2)

06-0448 O-ring (x2)

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

Includes attachment bolts shown

the type with one-piece engine gear (34T) and flywheel

Four page foldout

BSA 500 650 Mushroom Valve Adjuster SET a50 a65 made in USA BSA Memorabilia 06-0448 O-ring (x2)Suitable 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.