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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: 28834" data-attributes="member: 2532"><p>Matty,</p><p>I’m glad to hear that there seems to be at least one combination of parts that give this much engagement. Perhaps Vic and I have been unlucky.</p><p>I have just two point to help prepare you. </p><p>First, the OD of the 1.5inch shim needs to be about 46mm to fit inside the casting’s bore on the inside of the output bearing (……but this won’t change the chain-line because the bearing hasn’t been moved)</p><p>Second, the selector shaft OD is smaller than the bush OD so there will be a thin unworn rim on the bush face that will need removing……or a new bush. I wizzed about a millimetre off the face on mine and made the shim thicker.</p><p>My improvement measures are now twofold.</p><p>1. A 1mm or 1.2mm big shim as you are proposing.</p><p>2. A new selector with mods.</p><p>This entailed enlarging the peg hole in the nice new perfect selector to 3/8inch, as eccentric as possible, and then using a 3/8 peg with original size offset end to engage in the groove. This has given me 33thou ie 0.8mm shift of the fork.</p><p>(I’ll have to shim 3[SUP]<span style="font-size: 10px">rd</span>[/SUP] over to reduce the loss of engagement at that end).</p><p>So with these changes I should get 2mm more giving a total of 3.4 or more…….not far from your starting point!</p><p>Best wish</p></blockquote><p></p>
[QUOTE="tatty500, post: 28834, member: 2532"] Matty, I’m glad to hear that there seems to be at least one combination of parts that give this much engagement. Perhaps Vic and I have been unlucky. I have just two point to help prepare you. First, the OD of the 1.5inch shim needs to be about 46mm to fit inside the casting’s bore on the inside of the output bearing (……but this won’t change the chain-line because the bearing hasn’t been moved) Second, the selector shaft OD is smaller than the bush OD so there will be a thin unworn rim on the bush face that will need removing……or a new bush. I wizzed about a millimetre off the face on mine and made the shim thicker. My improvement measures are now twofold. 1. A 1mm or 1.2mm big shim as you are proposing. 2. A new selector with mods. This entailed enlarging the peg hole in the nice new perfect selector to 3/8inch, as eccentric as possible, and then using a 3/8 peg with original size offset end to engage in the groove. This has given me 33thou ie 0.8mm shift of the fork. (I’ll have to shim 3[SUP][SIZE=2]rd[/SIZE][/SUP] over to reduce the loss of engagement at that end). So with these changes I should get 2mm more giving a total of 3.4 or more…….not far from your starting point! Best wish [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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