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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Springs
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<blockquote data-quote="timetraveller" data-source="post: 113741" data-attributes="member: 456"><p>I had some special valves made with the thicker part of the stem 0.1" longer than standard. That took care of the extra lift. However, I struggled to find a suitable beehive valve spring and when I eventually found some, although the catalogue gave a maximum lift of 0.5" there was a note with them stating not to use more than 0.45". The valve spring retainers are different to the Vincent circlip ones and Roy Robertson very kindly machined new grooves in the upper valve stems to take the new retainers, which are more like Gold Star ones. I lent the parts to Mike Hawthorne to copy, and gave him the details of the supplier, but he has had some problems with his engine and, I think, valve bounce.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 113741, member: 456"] I had some special valves made with the thicker part of the stem 0.1" longer than standard. That took care of the extra lift. However, I struggled to find a suitable beehive valve spring and when I eventually found some, although the catalogue gave a maximum lift of 0.5" there was a note with them stating not to use more than 0.45". The valve spring retainers are different to the Vincent circlip ones and Roy Robertson very kindly machined new grooves in the upper valve stems to take the new retainers, which are more like Gold Star ones. I lent the parts to Mike Hawthorne to copy, and gave him the details of the supplier, but he has had some problems with his engine and, I think, valve bounce. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Springs
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