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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Guide Modification
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<blockquote data-quote="timetraveller" data-source="post: 140071" data-attributes="member: 456"><p>Yes it does. I designed it to try to serve several different purposes. The first is if the guide has been loose enough for long enough to destroy the thread for the lock ring as well as the fit of the lower guide into the head. One needs to get an over diametered guide made and once that is in place my gadget will hold it down by acting as a spacer between the bottom of the top guide and the flange on the lower guide. You need to make sure that the length is correct. No point having a few thou clearance as that would allow the lower guide to start to move again at some time in the future. If the thread for the lock ring is in good order then that can be refitted and then the bottom of my gadget can be cut off. In this case it acts to prevent the threaded lock ring ever becoming loose. It is quite deliberately designed so that it does not restrict the movement of the fork of the rocker at either the top or bottom of its movement. If the top of the lower guide is sufficient to allow half an inch of lift then my gadget will not limit that. As an aside the first pair of these I made years ago were in steel and worked well on the two bikes they were installed on. This time round they are made of the same aluminium alloy as the light weight JE steering stems, 7075. This was to try to ensure that any expansion or contraction due to heat would match the material of the cylinder head itself and also to assist anyone who has to modify the gadget to make it fit. I cannot guarantee that all cylinder heads have exactly the same dimensions at this position and so by using aluminium I have made it easier for those who only have access to hand tools to make the parts a good fit. I fitted one for myself recently and used a lathe to remove the bottom part which would replace the screwed lock ring if that had been destroyed and a file to ensure that the tang which stops any rotation was a good fit in the cut out in the cylinder head. At the same time I used a Dremel to deepen that semi-circular cut out to allow a better gas flow to a 'D' type breather.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 140071, member: 456"] Yes it does. I designed it to try to serve several different purposes. The first is if the guide has been loose enough for long enough to destroy the thread for the lock ring as well as the fit of the lower guide into the head. One needs to get an over diametered guide made and once that is in place my gadget will hold it down by acting as a spacer between the bottom of the top guide and the flange on the lower guide. You need to make sure that the length is correct. No point having a few thou clearance as that would allow the lower guide to start to move again at some time in the future. If the thread for the lock ring is in good order then that can be refitted and then the bottom of my gadget can be cut off. In this case it acts to prevent the threaded lock ring ever becoming loose. It is quite deliberately designed so that it does not restrict the movement of the fork of the rocker at either the top or bottom of its movement. If the top of the lower guide is sufficient to allow half an inch of lift then my gadget will not limit that. As an aside the first pair of these I made years ago were in steel and worked well on the two bikes they were installed on. This time round they are made of the same aluminium alloy as the light weight JE steering stems, 7075. This was to try to ensure that any expansion or contraction due to heat would match the material of the cylinder head itself and also to assist anyone who has to modify the gadget to make it fit. I cannot guarantee that all cylinder heads have exactly the same dimensions at this position and so by using aluminium I have made it easier for those who only have access to hand tools to make the parts a good fit. I fitted one for myself recently and used a lathe to remove the bottom part which would replace the screwed lock ring if that had been destroyed and a file to ensure that the tang which stops any rotation was a good fit in the cut out in the cylinder head. At the same time I used a Dremel to deepen that semi-circular cut out to allow a better gas flow to a 'D' type breather. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Guide Modification
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