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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin gearbox problems
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<blockquote data-quote="Don Morris" data-source="post: 16988" data-attributes="member: 4564"><p>Totally agree with vin998, I did the same with my post-war twin to fully engage top gear. Having seen other bikes where the selector was very badly worn and dogs worn rounded.</p><p> </p><p>To enable the input shaft to go further in, thus ensuring full engagement in top, I ground off part of the chamfer that is on the output shaft (by hand is OK). The end float, without any washers, is measured. This can be done either with a D.T.I. or feeler gauges between the end of the input shaft and a fixed point. The appropriate shim/s are then fitted just giving slight clearance. As clevtrev says as the engine heats up the clearance increases.</p><p> </p><p> </p><p>You should ensure that G11 is free when in neutral just in case you overdo the shims, it's an easy job but you must keep thinking about what you are doing. I am remember reading, in MPH, about someone, in neutral, who engaged a gear when he leant the bike over to pick something up and the bike shot round in a circle. This was probably due to wear on the selector forks or loose cam plate pivot or general wear and tear. In case this causes any concern this is not a common fault and has never been reported again.</p></blockquote><p></p>
[QUOTE="Don Morris, post: 16988, member: 4564"] Totally agree with vin998, I did the same with my post-war twin to fully engage top gear. Having seen other bikes where the selector was very badly worn and dogs worn rounded. To enable the input shaft to go further in, thus ensuring full engagement in top, I ground off part of the chamfer that is on the output shaft (by hand is OK). The end float, without any washers, is measured. This can be done either with a D.T.I. or feeler gauges between the end of the input shaft and a fixed point. The appropriate shim/s are then fitted just giving slight clearance. As clevtrev says as the engine heats up the clearance increases. You should ensure that G11 is free when in neutral just in case you overdo the shims, it's an easy job but you must keep thinking about what you are doing. I am remember reading, in MPH, about someone, in neutral, who engaged a gear when he leant the bike over to pick something up and the bike shot round in a circle. This was probably due to wear on the selector forks or loose cam plate pivot or general wear and tear. In case this causes any concern this is not a common fault and has never been reported again. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin gearbox problems
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