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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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<blockquote data-quote="RayF" data-source="post: 177097" data-attributes="member: 5740"><p>I have ordered today a tap,9/16 X 20 ,60 deg thread. The manufacturers comment was,ah yes,cycle thread. I also inspected the stud and plug that had been fitted to the crankcase. The plug/insert was 3/4 unc. The end of the stud had been turned down to something under half inch and threaded and fitted into the plug. I don't know yet the size of what it was tapped to as the plug is presently seized onto the stud. We would prefer to use a standard 9/16 stud and the 7/8 plug leaves little wall thickness so we are thinking to open that out to 1 inch.</p></blockquote><p></p>
[QUOTE="RayF, post: 177097, member: 5740"] I have ordered today a tap,9/16 X 20 ,60 deg thread. The manufacturers comment was,ah yes,cycle thread. I also inspected the stud and plug that had been fitted to the crankcase. The plug/insert was 3/4 unc. The end of the stud had been turned down to something under half inch and threaded and fitted into the plug. I don't know yet the size of what it was tapped to as the plug is presently seized onto the stud. We would prefer to use a standard 9/16 stud and the 7/8 plug leaves little wall thickness so we are thinking to open that out to 1 inch. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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