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Tech. Advice: Series 'A' 500cc/1000cc Bikes
1935 Series A 500 Burman BAP Gearbox questions
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<blockquote data-quote="ClassicBiker" data-source="post: 91750" data-attributes="member: 1632"><p>Okay so it was as I suspected after seeing video MartynG posted. When we took the outer cover off we discovered the box was really miss-timed. We followed the steps in the video to time it. Before that I turned the selector shaft to make sure it would rotate an select all gears. It selected all four gears and neutral. So on went the cover timed as in the video, between 2nd and 3rd gear. Into 2nd, no problem. Change to 3rd, fine. Change to 4th, okay. Back to 3rd good. Back to 2nd, nope won't go. Cover off again, re-time, try it again. same result. So we tried something different. Timed it between 2nd and 3rd. Into 2nd, no problem. Into neutral, good. Into 1st, good. Back to neutral, good. 2nd, good. 1st good. 2nd good. 3rd, fine, 2nd, okay, 3rd, good, 4th good. Back to 3rd, fine. 2nd, not going to happen. Tried this a couple of times. Once I go to 4th, I can return to 3rd, but then I'm stuck. Back and fourth from 1st to 3rd is fine. Once I hit 4th I can't go back beyond 3rd. So I thought the ratchet or pawl were worn. So I repeated flipping the pawl over. Figuring if I went to first and couldn't get beyond 2nd it was the pawl. If it remained the same the problem was with the ratchet. The problem remained. Examination of pawl and ratchet shows nothing out of the ordinary other than the springs look rather ominous and old grease (so much for the expert rebuild). New springs are on order and the grease will be cleaned. A new pawl has been ordered just in case, the hole and slot looked okay but the play seemed excessive. The alternate A series parts list has a part cx056 selector cover shown. This appears to be missing. It appears to fit between the selector spring box (bottom photo) and the outer cover. Looking to be a piece of sheet metal in the outline of the spring box of the selector mechanism. Is it imperative to have this and what is the most like thickness of material. I should also note that if I left the out cover off and held everything just so, gear selection up and down was not problem. So I believe that the problem lies with the ratchet and pawl. Opinions of the appearance of the ratchet teeth, the pawl, are invited. As are any other likely sources of the cause of the problem. All help and suggestion gratefully accepted and appreciated.</p><p>Steven [ATTACH=full]19981[/ATTACH][ATTACH=full]19982[/ATTACH][ATTACH=full]19983[/ATTACH]</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 91750, member: 1632"] Okay so it was as I suspected after seeing video MartynG posted. When we took the outer cover off we discovered the box was really miss-timed. We followed the steps in the video to time it. Before that I turned the selector shaft to make sure it would rotate an select all gears. It selected all four gears and neutral. So on went the cover timed as in the video, between 2nd and 3rd gear. Into 2nd, no problem. Change to 3rd, fine. Change to 4th, okay. Back to 3rd good. Back to 2nd, nope won't go. Cover off again, re-time, try it again. same result. So we tried something different. Timed it between 2nd and 3rd. Into 2nd, no problem. Into neutral, good. Into 1st, good. Back to neutral, good. 2nd, good. 1st good. 2nd good. 3rd, fine, 2nd, okay, 3rd, good, 4th good. Back to 3rd, fine. 2nd, not going to happen. Tried this a couple of times. Once I go to 4th, I can return to 3rd, but then I'm stuck. Back and fourth from 1st to 3rd is fine. Once I hit 4th I can't go back beyond 3rd. So I thought the ratchet or pawl were worn. So I repeated flipping the pawl over. Figuring if I went to first and couldn't get beyond 2nd it was the pawl. If it remained the same the problem was with the ratchet. The problem remained. Examination of pawl and ratchet shows nothing out of the ordinary other than the springs look rather ominous and old grease (so much for the expert rebuild). New springs are on order and the grease will be cleaned. A new pawl has been ordered just in case, the hole and slot looked okay but the play seemed excessive. The alternate A series parts list has a part cx056 selector cover shown. This appears to be missing. It appears to fit between the selector spring box (bottom photo) and the outer cover. Looking to be a piece of sheet metal in the outline of the spring box of the selector mechanism. Is it imperative to have this and what is the most like thickness of material. I should also note that if I left the out cover off and held everything just so, gear selection up and down was not problem. So I believe that the problem lies with the ratchet and pawl. Opinions of the appearance of the ratchet teeth, the pawl, are invited. As are any other likely sources of the cause of the problem. All help and suggestion gratefully accepted and appreciated. Steven [ATTACH=full]19981[/ATTACH][ATTACH=full]19982[/ATTACH][ATTACH=full]19983[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
1935 Series A 500 Burman BAP Gearbox questions
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