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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tank bolts shaking loose
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<blockquote data-quote="1660bob" data-source="post: 32510" data-attributes="member: 366"><p>Length may be same Danno, but I think from memory the bolt shoulder may enter a small counterbore in the headstock and therefore go in further than you expect-and the thickness of the washer equates to a lot of compression on the rubber also.Take a close look at the bolts,alone in the headstock,are they free to go in right up to the shoulder whereupon they should come to more or less a dead stop when nipped up?-thats the all important bit to stop loosening. If all good then measure the distance between the headstock face and the underside of the washer when the bolts are nipped up. Compare this fitted measurement with a free rubber length to see how much the difference and therefore how much rubber compression there will be - personally, I see no reason to compress the rubber more than half a turn of the bolt at the most-that compresses the rubber just a little-squashing the rubber achieves nothing but stress and distortion.If too much, you could, like me undercut the bolt head on a lathe -effectively lengthening the bolt slightly, or I suppose you could remove a little rubber from the OUTER end somehow to avoid the squash.Bob.</p></blockquote><p></p>
[QUOTE="1660bob, post: 32510, member: 366"] Length may be same Danno, but I think from memory the bolt shoulder may enter a small counterbore in the headstock and therefore go in further than you expect-and the thickness of the washer equates to a lot of compression on the rubber also.Take a close look at the bolts,alone in the headstock,are they free to go in right up to the shoulder whereupon they should come to more or less a dead stop when nipped up?-thats the all important bit to stop loosening. If all good then measure the distance between the headstock face and the underside of the washer when the bolts are nipped up. Compare this fitted measurement with a free rubber length to see how much the difference and therefore how much rubber compression there will be - personally, I see no reason to compress the rubber more than half a turn of the bolt at the most-that compresses the rubber just a little-squashing the rubber achieves nothing but stress and distortion.If too much, you could, like me undercut the bolt head on a lathe -effectively lengthening the bolt slightly, or I suppose you could remove a little rubber from the OUTER end somehow to avoid the squash.Bob. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tank bolts shaking loose
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