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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Drive Sprocket Failure
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<blockquote data-quote="Martyn Goodwin" data-source="post: 49775" data-attributes="member: 2433"><p>3 days back when in a tunnel on my Comet(the Melba on Eastlink) my bike lost all drive and I coasted to a stop, hugging the tunnel wall at trucks roared past, just a few inches from me. The motor was still running, I could change gear but no forward momentum.</p><p></p><p>Rescued by a breakdown truck, once home I eventually discovered that ALL of the splines on the inner of the gearbox drive sprocket had "disappeared"; the inner of the sprocket had the appearance of having been machined clean.</p><p></p><p>With the debris removed and all cleaned up a new sprocket has been installed and my Comet is back on the road again.</p><p></p><p>The failed sprocket was installed around 12,000 miles earlier. I can only (speculate) that the retaining nut was not sufficiently tight to prevent a very small rocking action that eventually wore the splines away. Fortunately, there is no apparent damage to the Burman gearbox output shaft or splines.</p><p></p><p>Has anyone experienced this type of failure before?</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 49775, member: 2433"] 3 days back when in a tunnel on my Comet(the Melba on Eastlink) my bike lost all drive and I coasted to a stop, hugging the tunnel wall at trucks roared past, just a few inches from me. The motor was still running, I could change gear but no forward momentum. Rescued by a breakdown truck, once home I eventually discovered that ALL of the splines on the inner of the gearbox drive sprocket had "disappeared"; the inner of the sprocket had the appearance of having been machined clean. With the debris removed and all cleaned up a new sprocket has been installed and my Comet is back on the road again. The failed sprocket was installed around 12,000 miles earlier. I can only (speculate) that the retaining nut was not sufficiently tight to prevent a very small rocking action that eventually wore the splines away. Fortunately, there is no apparent damage to the Burman gearbox output shaft or splines. Has anyone experienced this type of failure before? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Drive Sprocket Failure
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