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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="timetraveller" data-source="post: 133629" data-attributes="member: 456"><p>That is not going to help. I have not seen the later type so could you measure the internal distance between the top and bottom of the splines. It looks as though either the height of the splines must be higher or the internal diameter of the inner end must be smaller. If either is the case then it might not fit, and I assume that they do. My technique of using a valve seat grinding tool to give it a cone shape does not look as though it would work. One of them looks to have a very thick inner end and it might be possible to cut a stepped recess with a flat inner back to restrain the 'o' ring. What do you think? Even if it is possible it would certainly require better machining skills than just using a valve seat grinder in a pillar drill or mill.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 133629, member: 456"] That is not going to help. I have not seen the later type so could you measure the internal distance between the top and bottom of the splines. It looks as though either the height of the splines must be higher or the internal diameter of the inner end must be smaller. If either is the case then it might not fit, and I assume that they do. My technique of using a valve seat grinding tool to give it a cone shape does not look as though it would work. One of them looks to have a very thick inner end and it might be possible to cut a stepped recess with a flat inner back to restrain the 'o' ring. What do you think? Even if it is possible it would certainly require better machining skills than just using a valve seat grinder in a pillar drill or mill. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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