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1969 CL450 US Barn Find Restoration
K2-K6:
It appears to have witness marks on the next smaller diameter section of the cam suggesting impact. Is there any reason to thump it at all? Or could the PO have got it stuck in getting it in / out?
It's not the sort of material that lends itself to impact, obviously, but that looks more likely than other means.
It's difficult to see without the item in your hands to judge it, but from the photo it appears that it would be ok in service as so much of the flange remains to do the job it's designed for. Looks a bit drastic but low effect.
MrDavo:
I think it happened while trying to get it apart, there definitely are witness marks around the centre.
I just checked and found a post on the twins forum comparing the K6 cam with earlier ones, the profile and tacho drive are different, which is why I found one easily 🙁
hairygit:
Could have been the legendary mechaninc Bubba, maybe he tried to remove the cam without splitting the chain. (Seen it done on a CB175 years ago, what a mess!)
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K2-K6:
My train of thought is that all thing's being equal and if you could just get a new spare, then you'd change it as you don't have to make a judgment. Without supply though, you're forced into the judgment.
They are pretty well sized for the job they've got to do and have to take very little sideways load. It's been produced with enough meat on it to not give problems during machining (they don't have to be too sparing here as it's so close to centre it's inertia is low in use). To break it like that would take many times any service load it would see, and in a direction that's not envisaged in the design. In other words it should just never be subjected to load in that plane generally. I can't imagine any more material falling off it in service, so that shouldn't be an issue.
There seems to be a lot of the flange remaining to do the job without issue. As pointed out from the colour it's been broken a while. I feel the balance is in favour of using it, it doesn't look like it would fail.
AshimotoK0:
I think I have seen it mentioned on HondaTwins that those damper rings are more trouble than they are worth and some people remove them (bits break off and clog oilways when they harden). Worth searching and asking.
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