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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
More Adventures with the Comet
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<blockquote data-quote="timetraveller" data-source="post: 131710" data-attributes="member: 456"><p>Be careful with the grub screws Vic. Years ago there was a mod which required a hole to be drilled in the lower part of the rocker bush along its length. This had two diameters. A small one all the way through and a larger one to take a 2BA (if I remember correctly) grub screw. A saw cut was then made all along the length of the hole and a grub screw put into the outer facing end of the hole. When this grub screw was tightened it forced the rocker bush outwards so that it expanded and gripped the inside of the tunnel. This would work well enough for normal road use but a few quick burst of high revs at either a sprint or a speed trial and the grub screw would work its way outwards and drop into the timing gears. You will need to find some way of ensuring that the grub screws cannot fall out.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 131710, member: 456"] Be careful with the grub screws Vic. Years ago there was a mod which required a hole to be drilled in the lower part of the rocker bush along its length. This had two diameters. A small one all the way through and a larger one to take a 2BA (if I remember correctly) grub screw. A saw cut was then made all along the length of the hole and a grub screw put into the outer facing end of the hole. When this grub screw was tightened it forced the rocker bush outwards so that it expanded and gripped the inside of the tunnel. This would work well enough for normal road use but a few quick burst of high revs at either a sprint or a speed trial and the grub screw would work its way outwards and drop into the timing gears. You will need to find some way of ensuring that the grub screws cannot fall out. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
More Adventures with the Comet
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