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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ignition Advance
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<blockquote data-quote="Gerry Clarke" data-source="post: 128809" data-attributes="member: 2120"><p>In relation to the cylinder stud holes issue mentioned above. </p><p></p><p>I had cause to rebore two years ago. In the process I ordered a new muff and found on reassembly that I couldn't seat the cylinder head onto the spigot - the head just wouldn't travel all the way down the cylinder studs. Rather than the holes being too small, it seemed to me that the studs were being drawn slightly together and the pitch between the stud holes in the cylinder muff was .020" less than on my old, believed original, cylinder muff. I then did what I should have done in the first place, which was to have my old cylinder bored out. As expected, the head went on perfectly well then and we were back on the road.</p><p></p><p>The Spares Co. were very good about this and refunded me, but said they couldn't see any issue with the cylinder holes on whatever slave system they used to check. I was surprised that it only seemed to happen to me.</p><p></p><p>Gerry</p></blockquote><p></p>
[QUOTE="Gerry Clarke, post: 128809, member: 2120"] In relation to the cylinder stud holes issue mentioned above. I had cause to rebore two years ago. In the process I ordered a new muff and found on reassembly that I couldn't seat the cylinder head onto the spigot - the head just wouldn't travel all the way down the cylinder studs. Rather than the holes being too small, it seemed to me that the studs were being drawn slightly together and the pitch between the stud holes in the cylinder muff was .020" less than on my old, believed original, cylinder muff. I then did what I should have done in the first place, which was to have my old cylinder bored out. As expected, the head went on perfectly well then and we were back on the road. The Spares Co. were very good about this and refunded me, but said they couldn't see any issue with the cylinder holes on whatever slave system they used to check. I was surprised that it only seemed to happen to me. Gerry [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ignition Advance
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