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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Norton Gearbox Fitted to Comet
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<blockquote data-quote="davidd" data-source="post: 50270" data-attributes="member: 1177"><p>The plate is 6061. I have a piece of 7075 that I planned to use for the next racer. I have had not problems with it and one might suspect that it does not have the stiffness of the stock inner primary, but I have not found any decrease in handling caused by lack of stiffness. It is narrow compared to stock and with 18" wheels the added cornering clearance is necessary at full bump. Here is the primary shot of the plate:[ATTACH=full]2243[/ATTACH] </p><p>The three primary cover holes are marked "cover" and the "No" is short for Norton. I was using a crank-fired ignition so the two mounting holes for the pick-up and the hole for wires is in the center of the. The reluctor was held on by the mainshaft nut and it extended out and across the pully where it just stood proud of the pully so the pick-up could swipe it. The front hole has clearance for the oil seal housing. I think I would make the hole for the counter shaft smaller as it never seems big enough for the sprockets I use to slip through. It is pretty much the same work to take the box out from the other side and the smaller hole might help with strength. The lower most hole is the one that would be slotted slightly for some belt adjustment. This one is fixed.</p><p></p><p>David</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 50270, member: 1177"] The plate is 6061. I have a piece of 7075 that I planned to use for the next racer. I have had not problems with it and one might suspect that it does not have the stiffness of the stock inner primary, but I have not found any decrease in handling caused by lack of stiffness. It is narrow compared to stock and with 18" wheels the added cornering clearance is necessary at full bump. Here is the primary shot of the plate:[ATTACH=full]2243[/ATTACH] The three primary cover holes are marked "cover" and the "No" is short for Norton. I was using a crank-fired ignition so the two mounting holes for the pick-up and the hole for wires is in the center of the. The reluctor was held on by the mainshaft nut and it extended out and across the pully where it just stood proud of the pully so the pick-up could swipe it. The front hole has clearance for the oil seal housing. I think I would make the hole for the counter shaft smaller as it never seems big enough for the sprockets I use to slip through. It is pretty much the same work to take the box out from the other side and the smaller hole might help with strength. The lower most hole is the one that would be slotted slightly for some belt adjustment. This one is fixed. David David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Norton Gearbox Fitted to Comet
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