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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Refreshing Vincent Twin Clutch seals and pieces
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<blockquote data-quote="timetraveller" data-source="post: 104746" data-attributes="member: 456"><p>Ok Chaps, I have now looked out the bits and pieces and this has dislodged some of the long buried memories. I can see now what I did and why. Firstly. I have two of the ali outer pressure plates and the bad news is that one has a central hole of about 14.11 mm (possibly 5/8" originally) and the other has a larger central hole, 19.95 mm (over 3/4"). Therefore, as I do not have lots of Comet parts around someone needs to tell me what they need. The conversion is relatively straight forwards and I have plenty of parts left over. The original central steel part is pressed out. I now remember that some of these had a hole worn over half way through where the push rod had been doing its best to get to freedom. This central steel part is replaced with a new design of steel insert which has a hollowed out inner face to take the needle roller thrust race and a central hole to take a locator spigot in the face of the other half of the thrust system to apply pressure to the needle roller thrust race. If anyone has a pressure plate with the smaller diameter central hole then I have checked that there is enough metal round the larger outer pieces to allow them to be machined smaller to fit into the smaller holed. Thus on the basis of these two plates there should be no need to do any boring.</p><p>With the kits for the twins I provide a new piece of silver steel, hardened at one end (the inner) and with the outer end to be cut to length to fit into the inner part of the new thrust parts. After all this time I do not remember whether the original Burman push rods are in two parts or are long enough to interface with the new parts. With the twins they are not long enough and the piece of silver steel I supply is about 7.5" long to allow the owner to cut it to length and to replace the original outer part of the pushrod.</p><p>After all this time I cannot remember what I paid for these parts but would suggest that a price of £40 per kit would be about right for a kit to include the two new steel pieces, the needle roller thrust race and a piece of silver steel if that is required. Plus P&P of course. Over to you.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 104746, member: 456"] Ok Chaps, I have now looked out the bits and pieces and this has dislodged some of the long buried memories. I can see now what I did and why. Firstly. I have two of the ali outer pressure plates and the bad news is that one has a central hole of about 14.11 mm (possibly 5/8" originally) and the other has a larger central hole, 19.95 mm (over 3/4"). Therefore, as I do not have lots of Comet parts around someone needs to tell me what they need. The conversion is relatively straight forwards and I have plenty of parts left over. The original central steel part is pressed out. I now remember that some of these had a hole worn over half way through where the push rod had been doing its best to get to freedom. This central steel part is replaced with a new design of steel insert which has a hollowed out inner face to take the needle roller thrust race and a central hole to take a locator spigot in the face of the other half of the thrust system to apply pressure to the needle roller thrust race. If anyone has a pressure plate with the smaller diameter central hole then I have checked that there is enough metal round the larger outer pieces to allow them to be machined smaller to fit into the smaller holed. Thus on the basis of these two plates there should be no need to do any boring. With the kits for the twins I provide a new piece of silver steel, hardened at one end (the inner) and with the outer end to be cut to length to fit into the inner part of the new thrust parts. After all this time I do not remember whether the original Burman push rods are in two parts or are long enough to interface with the new parts. With the twins they are not long enough and the piece of silver steel I supply is about 7.5" long to allow the owner to cut it to length and to replace the original outer part of the pushrod. After all this time I cannot remember what I paid for these parts but would suggest that a price of £40 per kit would be about right for a kit to include the two new steel pieces, the needle roller thrust race and a piece of silver steel if that is required. Plus P&P of course. Over to you. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Refreshing Vincent Twin Clutch seals and pieces
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