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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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<blockquote data-quote="tatty500" data-source="post: 29250" data-attributes="member: 2532"><p>Matty,</p><p>Thanks for the information.</p><p>As Hercule Poirot suggests, when you have eliminated the probable, there remains only the improbable.</p><p>So, looking back at the evidence, perhaps the actual cause of meltdown is that of an earlier event the evidence for which is obliterated by the melt.</p><p>I have looked again at the pictures I took of the 5 gear pairs.</p><p>My set shows only a tiny engagement wear patch.</p><p>Vic’s set shows a two-stage, stepped wear pattern.</p><p>The other two and the CP box show one, longer wear patch.</p><p>So, is the actual cause an event long ago that wore the side of the selector without destroying it?</p><p>In the case of my box this must have been early in its life, as there is little wear at full engagement. The box then continued to function with the tiny engagement until finally melting and destroying the evidence of old selector wear.</p><p>In the case of Vic’s box, the event must have occurred at about half it’s life. The wear shows these two phases and the selector was finally totally melted, once again obliterating the earlier problem.</p><p>The other three sets have worn at their original engagement positions.</p><p>If I manage to send the pictures, they are as follows:</p><p>0CP A very warn lightweight CP box.</p><p>1my My metdown box</p><p>2new My new box</p><p>3vic Vic’s meldown bits</p><p>4prewar Chris’s pre-war BAP.</p><p>Who knows?………“the old man in the mountain, that’s who.”</p><p>Tatty</p></blockquote><p></p>
[QUOTE="tatty500, post: 29250, member: 2532"] Matty, Thanks for the information. As Hercule Poirot suggests, when you have eliminated the probable, there remains only the improbable. So, looking back at the evidence, perhaps the actual cause of meltdown is that of an earlier event the evidence for which is obliterated by the melt. I have looked again at the pictures I took of the 5 gear pairs. My set shows only a tiny engagement wear patch. Vic’s set shows a two-stage, stepped wear pattern. The other two and the CP box show one, longer wear patch. So, is the actual cause an event long ago that wore the side of the selector without destroying it? In the case of my box this must have been early in its life, as there is little wear at full engagement. The box then continued to function with the tiny engagement until finally melting and destroying the evidence of old selector wear. In the case of Vic’s box, the event must have occurred at about half it’s life. The wear shows these two phases and the selector was finally totally melted, once again obliterating the earlier problem. The other three sets have worn at their original engagement positions. If I manage to send the pictures, they are as follows: 0CP A very warn lightweight CP box. 1my My metdown box 2new My new box 3vic Vic’s meldown bits 4prewar Chris’s pre-war BAP. Who knows?………“the old man in the mountain, that’s who.” Tatty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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