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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Faulty G83 R.H. Kickstart shaft
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<blockquote data-quote="Seán Ó Maoildeirg" data-source="post: 41412" data-attributes="member: 2811"><p>I recently fitted a new G83 kickstart shaft because the original one was twisted and slightly bent and was only discovered when I was replacing the G47 and G46AS kickstart ratchet and pinion. I retained my G82 quadrant as it was in perfect condition.</p><p>I refitted the cover having fitted the new parts from the Vincent Spares Company and a few days later decided to give the bike a run. I turned it over a few times on the decompresser and then readied it for a good swing. BANG! the kickstart went with a sickening crunch. I quickly ripped off the cover to find the Quadrant in two parts, having broken at the internal splines. Closer inspection showed the G83 shaft splines were crumbling.</p><p></p><p>I still had the original shaft and brought both shafts to get a hardness test done as the old one resisted marking with a file and the new one was like butter to the file test.</p><p>The old one measures 22.5 HR"<strong>C</strong>" and 67.5 HR"<strong>A</strong>". in other words it had a very good hardcase.</p><p>The new one measures 27 HR"<strong>C</strong>" and 34 HR"<strong>A</strong>". In other words it's hardcase was just a joke.</p><p></p><p>Do any of you metallurgists have a more suitable steel and heat treatment in mind for this job.</p><p>I have been told that the supplier is using Material – EN24W (817M40) Heat treat to ‘W’ condition 1080-1240 N/mm[SUP]2[/SUP] (70-80 Tons/in[SUP]2[/SUP])</p></blockquote><p></p>
[QUOTE="Seán Ó Maoildeirg, post: 41412, member: 2811"] I recently fitted a new G83 kickstart shaft because the original one was twisted and slightly bent and was only discovered when I was replacing the G47 and G46AS kickstart ratchet and pinion. I retained my G82 quadrant as it was in perfect condition. I refitted the cover having fitted the new parts from the Vincent Spares Company and a few days later decided to give the bike a run. I turned it over a few times on the decompresser and then readied it for a good swing. BANG! the kickstart went with a sickening crunch. I quickly ripped off the cover to find the Quadrant in two parts, having broken at the internal splines. Closer inspection showed the G83 shaft splines were crumbling. I still had the original shaft and brought both shafts to get a hardness test done as the old one resisted marking with a file and the new one was like butter to the file test. The old one measures 22.5 HR"[B]C[/B]" and 67.5 HR"[B]A[/B]". in other words it had a very good hardcase. The new one measures 27 HR"[B]C[/B]" and 34 HR"[B]A[/B]". In other words it's hardcase was just a joke. Do any of you metallurgists have a more suitable steel and heat treatment in mind for this job. I have been told that the supplier is using Material – EN24W (817M40) Heat treat to ‘W’ condition 1080-1240 N/mm[SUP]2[/SUP] (70-80 Tons/in[SUP]2[/SUP]) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Faulty G83 R.H. Kickstart shaft
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