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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Sprocket
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<blockquote data-quote="Robert Watson" data-source="post: 3148" data-attributes="member: 38"><p>I tried (Well David Meadowcroft tried) for some time to find out the metalurgy Holder was using for his sprockets, to no avail. I did this because I found they just wore out far too quickly. At 10,000 miles they were done. (Yes I put 10,000 miles on the Woolly Mammoth last year) I now re-ring old sprockets with SAE 8620 case hardened sprockets, which at 10,000 miles show no wear. (Yes I put 10,000 miles on the Woolly Mammoth last year, and by the way the alloy rear sprocket is also still in great shape - Sprocket Specialists in the USA - 7075 and hard anodized although it only got about 8000 miles as a shattered brake drum meant using the other sprocket for a couple of thousnad miles) These rings are made by a small outfit that does nothing else but countershaft sprockets in the US for the dirtbike market. I really don't do it commercially and I have recently sent a batch of rings to the UK for a member there to do the same, although he is looking for a UK source of a similar solution. The rings are 2 1/2 ID so on the older Burman sprockets, unless going to a 520 chain, they will require a little grinding to clear a socket over the large nut. Having said that I am just about to do the sprocket from my A twin, and it has no recess but is full width from shaft to rim. As I am going to 520 chain I may save this for a 530 rebuild and find a recessed one instead. I mostly started this to do postwar twin sprockets as they are more complicated to make with that seal boss to consider. I have found one where the seal boss ran more than .020 out of concentricity with the bore. I bet the guy who had that on his bike could never figure out why it leaked!</p><p></p><p>Robert</p></blockquote><p></p>
[QUOTE="Robert Watson, post: 3148, member: 38"] I tried (Well David Meadowcroft tried) for some time to find out the metalurgy Holder was using for his sprockets, to no avail. I did this because I found they just wore out far too quickly. At 10,000 miles they were done. (Yes I put 10,000 miles on the Woolly Mammoth last year) I now re-ring old sprockets with SAE 8620 case hardened sprockets, which at 10,000 miles show no wear. (Yes I put 10,000 miles on the Woolly Mammoth last year, and by the way the alloy rear sprocket is also still in great shape - Sprocket Specialists in the USA - 7075 and hard anodized although it only got about 8000 miles as a shattered brake drum meant using the other sprocket for a couple of thousnad miles) These rings are made by a small outfit that does nothing else but countershaft sprockets in the US for the dirtbike market. I really don't do it commercially and I have recently sent a batch of rings to the UK for a member there to do the same, although he is looking for a UK source of a similar solution. The rings are 2 1/2 ID so on the older Burman sprockets, unless going to a 520 chain, they will require a little grinding to clear a socket over the large nut. Having said that I am just about to do the sprocket from my A twin, and it has no recess but is full width from shaft to rim. As I am going to 520 chain I may save this for a 530 rebuild and find a recessed one instead. I mostly started this to do postwar twin sprockets as they are more complicated to make with that seal boss to consider. I have found one where the seal boss ran more than .020 out of concentricity with the bore. I bet the guy who had that on his bike could never figure out why it leaked! Robert [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Sprocket
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