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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Drive Sprocket Loose
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<blockquote data-quote="Matty" data-source="post: 113045" data-attributes="member: 1339"><p>All very interesting but I think the basic problem is that many of the spare sprockets in the past were probably manufactured from poor and possibly cheaper material than the originals.</p><p>As pointed out the drive sprockets on many modern bikes are only held on with a circlip and are quite sloppy on the splines and seem to be fine though it does not look on the face of it a very good piece of engineering.</p><p>I have changed chains and sprockets on many modern bikes and not noticed any significant problems with badly damaged splines.</p><p>As I have said in the forum before, I have only once changed the front sprocket on my Comet at around 50,000 miles and am still using the "new one" at 106,000 miles.</p><p>I am however now a bit worried and may have to go through the trauma of inspecting mine by removing the primary drive casing etc. though the last time I rebuilt the gearbox around 6,000 mile ago it seemed OK and I did the nut up VERY tight on the bench with no Loctite.</p><p>The nut which holds the clutch on is subject to similar forces and I have in the past had to replace the clutch cage where the splines were reduced to about half the width - though the mainshaft splines looked fine - probably because the shaft was made of superior steel.</p><p>I am only an electronics Engineer and not a metallurgist or mechanical engineer so my views are really only subjective without a great deal of real science applied. </p><p>I hate to say this, but have heard that some people have welded the sprocket onto the shaft which I should think would have Phil Irving turning in his grave.</p></blockquote><p></p>
[QUOTE="Matty, post: 113045, member: 1339"] All very interesting but I think the basic problem is that many of the spare sprockets in the past were probably manufactured from poor and possibly cheaper material than the originals. As pointed out the drive sprockets on many modern bikes are only held on with a circlip and are quite sloppy on the splines and seem to be fine though it does not look on the face of it a very good piece of engineering. I have changed chains and sprockets on many modern bikes and not noticed any significant problems with badly damaged splines. As I have said in the forum before, I have only once changed the front sprocket on my Comet at around 50,000 miles and am still using the "new one" at 106,000 miles. I am however now a bit worried and may have to go through the trauma of inspecting mine by removing the primary drive casing etc. though the last time I rebuilt the gearbox around 6,000 mile ago it seemed OK and I did the nut up VERY tight on the bench with no Loctite. The nut which holds the clutch on is subject to similar forces and I have in the past had to replace the clutch cage where the splines were reduced to about half the width - though the mainshaft splines looked fine - probably because the shaft was made of superior steel. I am only an electronics Engineer and not a metallurgist or mechanical engineer so my views are really only subjective without a great deal of real science applied. I hate to say this, but have heard that some people have welded the sprocket onto the shaft which I should think would have Phil Irving turning in his grave. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Drive Sprocket Loose
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