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I'd be tempted to try a new clutch perch & lever, with the new OEM cable (which now comes with 2 rubber blocks to keep the cable off the fins).
Thanks for your suggestion all. Rodekyl, thats really out of the box thinking but I don't think that's the issue here.This is a photo of the 2nd cable that only lasted about about 1K. This one was slipping bit by bit from the start. As you can see it was cleanly pulled out and there is little wear on the plastic.MG Cycles provided excellent service with replacing the cable.Today I'm going to install cable #4 and get under the bike to look at the lever there.
Interesting theory TimmyTheHog. There is some up and down movement in the lever but it doesn't seem to be much more than my other bikes.Here is the third cable after failure. You can see the pink nail varnish I put on to check for slippage about 1/2 inch from where it was.
Sadly the last clutch cable has also failed me, after 4 months and probably less than 1000km.This time my dab of nail varnish showed no sign of any give until this morning where it took about 4 pulls of the clutch to become unrideable.The feel of the clutch was always smooth and light. I do have a Sport 1100 with a heavy clutch but I'm sure I haven't developed super human strength with my clutch hand.Anyway big thumbs up to Ghostriders for the quick pick up.