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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="The VOC Spares Company Limited" data-source="post: 41496" data-attributes="member: 1603"><p>I was discussing this issue with Seán, but now he has to put subject on the Public Forum I will have to respond here.</p><p>The G83 shaft has been drawn with full material specification by the VOC Technical Committee, while Seán was adding this post I was driving to the manufacturer who has been making these for us for several years, to check that the drawing was followed and see the material certificate. I can confirm the shaft was made in accordance with the drawing and from the correct specified material.</p><p></p><p>Now to the problem, I have not seen the parts, only a photo and Seán’s description. Seán has made the classic error in confusing <em>hardness </em>with <em>strength, </em>the shaft Seán replaced (I won’t say ‘original’ as we don’t know the origin of this shaft) in Seán’s own words was ‘bent’ and ‘twisted’ so not very strong then.</p><p>That shaft may have been case hardened, but as we know this is a treatment to prevent suface wear and as the kickstart shaft is not rotating much or often, this is a secondary consideration. I don’t believe that if, as Seán claims, the splines on the shaft failed case hardening would have prevented it. The main consideration must be strength as we don’t want shafts that bends and twists do we? Furthermore we must not make the shaft too hard as with the twisting action and the numerous stress raising points the shaft could snap. Hence the chosen selection of the material.</p><p></p><p>As we only supplied Seán with the shaft he needed to fit it, now Seán told me he used a hammer, all be it a rubber one, to fit the new shaft and I sure he was very careful but can we be sure that the shaft was perpendicular to the quadrant at all times, could the shaft have canted over or broached and cracked the quadrant? </p><p>I know this can happen as I have assembled over a dozen G83AS quadrant assemblies over the last couple of years and even putting the shaft using a press I have cracked a quadrant. </p><p> </p><p>All of that said I am of a mind to replace these parts, without prejudice as one has to say these days, in the interest of good customer service and as it could be impossible to find the initial cause when the parts are so damaged we could spend a lot of time going round in circles and Seán wants to ride his Vin and I have plenty to as well.</p><p> </p><p>Note to Sid, we have an undercut in the area you describe so not problem there.</p><p></p><p>Ian Savage</p><p>VOC Spares Co</p></blockquote><p></p>
[QUOTE="The VOC Spares Company Limited, post: 41496, member: 1603"] I was discussing this issue with Seán, but now he has to put subject on the Public Forum I will have to respond here. The G83 shaft has been drawn with full material specification by the VOC Technical Committee, while Seán was adding this post I was driving to the manufacturer who has been making these for us for several years, to check that the drawing was followed and see the material certificate. I can confirm the shaft was made in accordance with the drawing and from the correct specified material. Now to the problem, I have not seen the parts, only a photo and Seán’s description. Seán has made the classic error in confusing [I]hardness [/I]with [I]strength, [/I]the shaft Seán replaced (I won’t say ‘original’ as we don’t know the origin of this shaft) in Seán’s own words was ‘bent’ and ‘twisted’ so not very strong then. That shaft may have been case hardened, but as we know this is a treatment to prevent suface wear and as the kickstart shaft is not rotating much or often, this is a secondary consideration. I don’t believe that if, as Seán claims, the splines on the shaft failed case hardening would have prevented it. The main consideration must be strength as we don’t want shafts that bends and twists do we? Furthermore we must not make the shaft too hard as with the twisting action and the numerous stress raising points the shaft could snap. Hence the chosen selection of the material. As we only supplied Seán with the shaft he needed to fit it, now Seán told me he used a hammer, all be it a rubber one, to fit the new shaft and I sure he was very careful but can we be sure that the shaft was perpendicular to the quadrant at all times, could the shaft have canted over or broached and cracked the quadrant? I know this can happen as I have assembled over a dozen G83AS quadrant assemblies over the last couple of years and even putting the shaft using a press I have cracked a quadrant. All of that said I am of a mind to replace these parts, without prejudice as one has to say these days, in the interest of good customer service and as it could be impossible to find the initial cause when the parts are so damaged we could spend a lot of time going round in circles and Seán wants to ride his Vin and I have plenty to as well. Note to Sid, we have an undercut in the area you describe so not problem there. Ian Savage VOC Spares Co [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Faulty G83 R.H. Kickstart shaft
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