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06-0448 O-ring (x2)
this guard is undrilled for the small fiberglass tailpiece that was added later
This listing is for both the extractor and dummy shaft/shim locator
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.
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