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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Drive Sprocket Loose
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<blockquote data-quote="Martyn Goodwin" data-source="post: 113051" data-attributes="member: 2433"><p>I think I <em>MAY </em>have found a contributing factor.</p><p></p><p>I have a brand new PR50-17-1BA driving gear lock washer AND a brand new PR50-22A gear box sprocket both from the Spares Co.</p><p></p><p>The OD of the lock washer is 2.6165" with a thickness of 0.0350 and it appears to be lazer cut.</p><p></p><p>The ID of the sprocket central depression appears to be 2.6370" but that is at the outside edge of the central depression (see photo). Problem is that depression has round shoulders at it base so the flat face for the washer and nut to clamp against is only 2.4910" in diameter.</p><p></p><p>What this means is when assembled, before the nut is secured, the face of the washer is well clear of the face of the sprocket and consequently as the nut is tightened against the washer, the washer acts like a spring absorbing a lot or the hoped for clamping force.</p><p></p><p>I do not know how significant this is - anyone have any thoughts?</p><p></p><p>My first thought was reducing the OD of the lock washer to 2.5" to eliminate the spring effect.</p><p></p><p>On reflection a spacer between the face of the sprocket and the lock washer may be a better solution. Has anyone encountered this before? Should there be a spacer there anyway and if yes I wonder what the part number is??</p><p></p><p>[ATTACH=full]30163[/ATTACH][ATTACH=full]30165[/ATTACH]</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 113051, member: 2433"] I think I [I]MAY [/I]have found a contributing factor. I have a brand new PR50-17-1BA driving gear lock washer AND a brand new PR50-22A gear box sprocket both from the Spares Co. The OD of the lock washer is 2.6165" with a thickness of 0.0350 and it appears to be lazer cut. The ID of the sprocket central depression appears to be 2.6370" but that is at the outside edge of the central depression (see photo). Problem is that depression has round shoulders at it base so the flat face for the washer and nut to clamp against is only 2.4910" in diameter. What this means is when assembled, before the nut is secured, the face of the washer is well clear of the face of the sprocket and consequently as the nut is tightened against the washer, the washer acts like a spring absorbing a lot or the hoped for clamping force. I do not know how significant this is - anyone have any thoughts? My first thought was reducing the OD of the lock washer to 2.5" to eliminate the spring effect. On reflection a spacer between the face of the sprocket and the lock washer may be a better solution. Has anyone encountered this before? Should there be a spacer there anyway and if yes I wonder what the part number is?? [ATTACH type="full" alt="20191121_102800a.jpg"]30163[/ATTACH][ATTACH type="full" alt="20191121_111452a.jpg"]30165[/ATTACH] [/QUOTE]
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Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Drive Sprocket Loose
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