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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Snatchy clutch or Kangaroo petrol?
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<blockquote data-quote="Tim Kirker" data-source="post: 55507" data-attributes="member: 200"><p>Not a frequent visitor to the forum but this thread has been fascinating. I have a couple of points to add to the search for the perfect clutch. When I was having trouble with the primary clutch not lifting squarely, I eventually tracked it down to the end of the pushrod not being square. Spinning it in a drill showed it was like a swash plate. Ground it square, and hey presto. I know it seems ridiculous that a thou ar two at a radius of 0.125" can swing the whole primary clutch over, but it did. Another thing to check is that the two clutch shoes are "symmetrical" - similar thickness of lining and, when at rest, similar clearances between linings and the drum, and similar (preferably no) clearance between the plunger pins and C14s. (In my case I fitted a sleeve round C14 to reduce backlash on one side. Then there's the old trick that I haven't seen mentioned above of fitting 6 washers behind the primary plate C21 because this plate can sometimes foul on the C9 pins behind it, limiting the rocking action of the shoes. (Look for polish marks on the back of C21.) When checking and balancing the C29 springs, also check and balance the C30 cups - I've had cups of different depths that have the same effect as different length springs, and it's the last thing you look for . . . Clearance under the C20 nut should be the minimum that leaves it free. Not only does this control end float but, if there's wear in the bushes the whole primary clutch and shoe carrier can rock relative to the drum. I could see this in my clutch- when operating the lever the primary clutch seemed to 'flop' down as it lifted, moving more at the top than the bottom. increased shimming under the nut stopped this. When you eventually get it right you will wonder what all the fuss was about . . .</p></blockquote><p></p>
[QUOTE="Tim Kirker, post: 55507, member: 200"] Not a frequent visitor to the forum but this thread has been fascinating. I have a couple of points to add to the search for the perfect clutch. When I was having trouble with the primary clutch not lifting squarely, I eventually tracked it down to the end of the pushrod not being square. Spinning it in a drill showed it was like a swash plate. Ground it square, and hey presto. I know it seems ridiculous that a thou ar two at a radius of 0.125" can swing the whole primary clutch over, but it did. Another thing to check is that the two clutch shoes are "symmetrical" - similar thickness of lining and, when at rest, similar clearances between linings and the drum, and similar (preferably no) clearance between the plunger pins and C14s. (In my case I fitted a sleeve round C14 to reduce backlash on one side. Then there's the old trick that I haven't seen mentioned above of fitting 6 washers behind the primary plate C21 because this plate can sometimes foul on the C9 pins behind it, limiting the rocking action of the shoes. (Look for polish marks on the back of C21.) When checking and balancing the C29 springs, also check and balance the C30 cups - I've had cups of different depths that have the same effect as different length springs, and it's the last thing you look for . . . Clearance under the C20 nut should be the minimum that leaves it free. Not only does this control end float but, if there's wear in the bushes the whole primary clutch and shoe carrier can rock relative to the drum. I could see this in my clutch- when operating the lever the primary clutch seemed to 'flop' down as it lifted, moving more at the top than the bottom. increased shimming under the nut stopped this. When you eventually get it right you will wonder what all the fuss was about . . . [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Snatchy clutch or Kangaroo petrol?
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