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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Gear Change Adjustment
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<blockquote data-quote="Ducdude" data-source="post: 116547" data-attributes="member: 2077"><p>Hi John, My 52 twin did this same thing a few years ago. If you go to page 40 in the handbook you will see the sequence for adjusting gear-change mechanism. </p><p></p><p>This is all done with 2nd gear selected and the shifter cover removed. First you are adjusting G61/1 So that the shifter ratchet is centered in the shifter pawl ( there is a good picture ) to show what they are talking about . </p><p></p><p>Once that is done you are adjusting the lever stop-G49's position by turning eccentric adjuster G57 just so again in 2nd gear, up gives you a solid interface with 1st and down gives you 3rd..</p><p></p><p>What they do not tell you is this is an iterative process that can yield 1st, 2nd working but 3 and 4th popping out as well as the inverse. I found it helpful to just leave the pipes and cover off and have a short spin down the drive way to see if I can pick up all 4 gears. (warning parts can ejected if the cover is not on) If not re adjust the eccentric again. </p><p></p><p>In my case it only took small adjustments with new parts to get the bike shifting just so. The original bits G49 and G57 had to much ware to properly adjust for any reasonable duration.</p><p></p><p>Once the new parts were on I tried adjustments with G57 full on in one direction then the other losing 1st and 2nd but having 3rd and 4th then losing 3rd and 4th but 1st and 2nd were good. Then with it set just about in the middle with a small bias to the direction that picked up 1st and 2nd better (I had been losing 1st at this exercise's start) I locked it in and all has been well since. </p><p></p><p>If this does not fix your the shifting then I would give very close attention to the cam plate spindle under the generator and make sure it does not spin or pivot or is lose in any way while the gear selector is moved. All ways good to check this every so often. I can just get my finger on it with the miller installed) Mine is safety wired and lock tightened to make sure it stays in place. (I would weld it in place if I thought it would help) I have been told that Phil Irving did NOT feel that the cam plate spindle support was his best work as it is a weakness in an otherwise sturdy design. </p><p></p><p>Wishing you the best of luck!</p><p></p><p>Eric</p></blockquote><p></p>
[QUOTE="Ducdude, post: 116547, member: 2077"] Hi John, My 52 twin did this same thing a few years ago. If you go to page 40 in the handbook you will see the sequence for adjusting gear-change mechanism. This is all done with 2nd gear selected and the shifter cover removed. First you are adjusting G61/1 So that the shifter ratchet is centered in the shifter pawl ( there is a good picture ) to show what they are talking about . Once that is done you are adjusting the lever stop-G49's position by turning eccentric adjuster G57 just so again in 2nd gear, up gives you a solid interface with 1st and down gives you 3rd.. What they do not tell you is this is an iterative process that can yield 1st, 2nd working but 3 and 4th popping out as well as the inverse. I found it helpful to just leave the pipes and cover off and have a short spin down the drive way to see if I can pick up all 4 gears. (warning parts can ejected if the cover is not on) If not re adjust the eccentric again. In my case it only took small adjustments with new parts to get the bike shifting just so. The original bits G49 and G57 had to much ware to properly adjust for any reasonable duration. Once the new parts were on I tried adjustments with G57 full on in one direction then the other losing 1st and 2nd but having 3rd and 4th then losing 3rd and 4th but 1st and 2nd were good. Then with it set just about in the middle with a small bias to the direction that picked up 1st and 2nd better (I had been losing 1st at this exercise's start) I locked it in and all has been well since. If this does not fix your the shifting then I would give very close attention to the cam plate spindle under the generator and make sure it does not spin or pivot or is lose in any way while the gear selector is moved. All ways good to check this every so often. I can just get my finger on it with the miller installed) Mine is safety wired and lock tightened to make sure it stays in place. (I would weld it in place if I thought it would help) I have been told that Phil Irving did NOT feel that the cam plate spindle support was his best work as it is a weakness in an otherwise sturdy design. Wishing you the best of luck! Eric [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Gear Change Adjustment
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