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Paging TOG on Zephyrs



No answer from you phone, are you out celebrating resigning perhaps?

DanL had a dekko at this Zephyr 550 that was mentioned recently. It seems
good except for a noise at tickover. Bottom endish Dan thought, something
between rumbling and knocking. It goes away under load when revved though
and the owner claims get less when warm. I could hear it over his phone
though.

Does this ring any (alarm) bells, or remind you of anything. I think you
Does it go away if the clutch lever is pulled in?
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Cheers but I have no workshop over here and two project bikes already!
Always treat an engine as a non-runner unless it can be proven to the
contrary. Or unless the seller gives a guarantee.
So do the 550 and 750 both have primary chains?
Much of a job to change them? (for a bike shop)
Yes, yes and yes.
It's a crankcases apart job, as the primary chain is endless and runs
round the crank between conrods 2 and 3.

Mind you, I wouln't necessarily agree with TOG's diagnosis. Sure, the
primary chains *can* get a bit noisy on the middle-sized air-cooled
Zeds (the big ones always had gear primary drive), but only after
stellar mileages, and even then they never seem to do any harm. They
just rattle a bit.

I'd have thought the cam chain was a more likely candidate, not least
because the camchain adjuster always sticks on those engines.
Well, yes, but they rattle rather than rumble. Unless we have an
auditorially challenged owner here. Which is possible.

know these engines.