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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series A clutch
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<blockquote data-quote="A_HRD" data-source="post: 99137" data-attributes="member: 49"><p>Andy,</p><p>All 'A' singles were originally equipped with the 4 spring clutch. But they were prone to slip and when the 5 spring variant arrived (very late 30s or just post-war?), many owners changed to it with good results. </p><p></p><p>As Bill says, if you have the duplex sprockets attached to the clutch baskets, at least that part is right. There should be 6 x rubber shock-absorbers built-in, right? There were various splined clutch centres with various depths, it is worth getting a deeper one, if you can, so that you can fit an extra friction plate. </p><p></p><p>The worst problem with these clutches on the As was the short engagement of the mainshaft splines with the clutch centre - not much more than 1/8th inch. So start by checking mainshaft for wear and the corresponding inner-splines in the clutch centres. A clever welder could probably make good if you can do the fettling donkey-work to reclaim the splines from the weld. </p><p></p><p>I'm not going to be around much for the next couple of weeks so I'm not in a position to assist with photos or measurements; perhaps someone else can chime in please? Alternatively, why not email your questions to Andrew Walker? </p><p></p><p>Peter B</p></blockquote><p></p>
[QUOTE="A_HRD, post: 99137, member: 49"] Andy, All 'A' singles were originally equipped with the 4 spring clutch. But they were prone to slip and when the 5 spring variant arrived (very late 30s or just post-war?), many owners changed to it with good results. As Bill says, if you have the duplex sprockets attached to the clutch baskets, at least that part is right. There should be 6 x rubber shock-absorbers built-in, right? There were various splined clutch centres with various depths, it is worth getting a deeper one, if you can, so that you can fit an extra friction plate. The worst problem with these clutches on the As was the short engagement of the mainshaft splines with the clutch centre - not much more than 1/8th inch. So start by checking mainshaft for wear and the corresponding inner-splines in the clutch centres. A clever welder could probably make good if you can do the fettling donkey-work to reclaim the splines from the weld. I'm not going to be around much for the next couple of weeks so I'm not in a position to assist with photos or measurements; perhaps someone else can chime in please? Alternatively, why not email your questions to Andrew Walker? Peter B [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series A clutch
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