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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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<blockquote data-quote="Matty" data-source="post: 28291" data-attributes="member: 1339"><p><span style="font-family: 'Times New Roman'">Hi Vic - This is just to tie up the loose ends of this saga for a while as far as I am concerned.</span></p><p><span style="font-family: 'Times New Roman'"></span></p><p><span style="font-family: 'Times New Roman'">Have picked up your "broken" parts from Mayland via tatty500. They are very interesting and obviously the tolerances of the depth of the sliding 4th gear dog into the output gear were very dodgy from new. Yours had only a mm or so engagement even though there was not very much wear on the selector pins, etc. The 4th gear dogs were worn very tapered however for a mm or so due I suspect to both cause and the effect of insufficient depth of engagement.</span></p><p> </p><p><span style="font-family: 'Times New Roman'">When I rebuild my gearbox with a replacement casing, I will look at the tolerances in my box compared with your old bits. Then maybe, as suggested by "tatty500" after also examining Vic Youle's damaged gears, will, if necessary try to move the output gear in a mm or two with a spacer washer, after grinding a taper on the gear teeth or removing some metal from the selector casting to win some clearance. </span><span style="font-family: 'Times New Roman'">This would hopefully increase the depth of engagement at the expense of slight drive chain misalignment, but could perhaps also cause a problem with the length of thread left for the nut to hold on the drive chain sprocket - will investigate.</span> </p><p></p><p> </p><p><span style="font-family: 'Times New Roman'">Will keep you all informed when/if I get a result.</span></p><p><span style="font-family: 'Times New Roman'"></span></p><p><span style="font-family: 'Times New Roman'">Matty</span></p></blockquote><p></p>
[QUOTE="Matty, post: 28291, member: 1339"] [FONT=Times New Roman]Hi Vic - This is just to tie up the loose ends of this saga for a while as far as I am concerned. [/FONT] [FONT=Times New Roman]Have picked up your "broken" parts from Mayland via tatty500. They are very interesting and obviously the tolerances of the depth of the sliding 4th gear dog into the output gear were very dodgy from new. Yours had only a mm or so engagement even though there was not very much wear on the selector pins, etc. The 4th gear dogs were worn very tapered however for a mm or so due I suspect to both cause and the effect of insufficient depth of engagement.[/FONT] [FONT=Times New Roman] [/FONT] [FONT=Times New Roman]When I rebuild my gearbox with a replacement casing, I will look at the tolerances in my box compared with your old bits. Then maybe, as suggested by "tatty500" after also examining Vic Youle's damaged gears, will, if necessary try to move the output gear in a mm or two with a spacer washer, after grinding a taper on the gear teeth or removing some metal from the selector casting to win some clearance. [/FONT][FONT=Times New Roman]This would hopefully increase the depth of engagement at the expense of slight drive chain misalignment, but could perhaps also cause a problem with the length of thread left for the nut to hold on the drive chain sprocket - will investigate.[/FONT] [FONT=Times New Roman][/FONT] [FONT=Times New Roman]Will keep you all informed when/if I get a result. Matty[/FONT] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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