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The thread on series A valves is 11/32" x 32 TPI. I would like to purchase a tap & die set. Does anyone know of where they can be obtained?
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try traceys tools
try tracys tools
Hello Vic, Brother Ron had a few " A " s, I don't remember him having trouble with the Threaded bit of the valves, His trouble was from the B.A., Screws and nuts which stopped the locking plate from undoing,What is the idea about threads on these valves unlike split collets ? I do know nothing about series A engines, any photos for me to learn more ?
Actually I would be a little scared to cut threads into the valve stem - or so I imagine from this posting.
Quite right Kettirj; and Bob Stafford's write-up for using postwar valves - but retaining the hairpins for aesthetic reasons - is in "Back to A" on Page 244. Some people went further and modified the heads for post-war springs too....I think that Harold converted his heads to coil springs. Bob Stafford documented in the past, the use of post war valves. This mod should be in the new book to come out regarding the series 'A' bikes. Maybe the original idea was to be able to vary the spring pressure for some reason by screwing the spring retainer up or down the threads. As far as I know, there is less chance of the valves breaking at the threads than there is of the post war valves breaking at the step where the collar sits.