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K2F Cam Ring #786641 10/09/19 1:55 pm
Joined: Jan 2009
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Dr. Z Online Content OP
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The A10 started misfiring on a short ride, and at the same time I noticed that the manual advance was stuck on full advance. After removing and checking the points it started easily, but started misfiring after less than a minute of riding. Taking out the points again, I saw that the cam ring had moved and the advance cable was again jammed. At this point it looks like the cam ring is moving past the cut-out area on the ring which should keep advance-retard within the range of a few degrees. Also the magneto end of the advance cable does not hold the ring in place.

At least the problem is isolated in the advance mechanism, but I do not know what to try at this point and any suggestions would be appreciated.


Craig Zaspel

T100R
BSA A10
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Re: K2F Cam Ring [Re: Dr. Z] #786646 10/09/19 3:40 pm
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triton thrasher Offline
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I don’t see how it can go that far over-retarded unless the cam ring is not held in close enough by the end cap, thus allowing the ring to ride over the peg that’s supposed to limit its movement.

Is there something non-standard about the end cap or its O-ring? Had the cap come loose?

If you get the ring held closer in, the cable nipple might not jump out of it.


Amateur Loctite enthusiast.
Re: K2F Cam Ring [Re: Dr. Z] #786647 10/09/19 3:48 pm
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Dr. Z Online Content OP
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TT, The cap is not loose, but it never had an o-ring. It seems like the ring is moving out after running for 2 years with no problem.


Craig Zaspel

T100R
BSA A10
Re: K2F Cam Ring [Re: Dr. Z] #786945 10/12/19 10:47 pm
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Dr. Z Online Content OP
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It was a simple fix. As TT suggested, the cam ring was not held in close enough by the end cap so the ring could slide past the post. It looks like the bakelite end cap wore down after over 60 years, and a shim between the end cap and ring was all that was needed. Sometimes the simple fixes take longer to find.


Craig Zaspel

T100R
BSA A10

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