The only bit you even got close on was "Muppet"
Someone at some stage, possibly even the half pissed Italian back from to many Vinos at lunchtime didn't torque up the nut that holds the top bevel gears together when it was originally assembled
It came loose and let the gears move enough that the woodruff key came out which played havoc with the valve timing
It has had the head off at some stage for an exhaust port thread repair so it might have even been apart then
It was going to get the valve clearances done when I got back but even then I don't know if that would have been spotted, nothing about 3K can't fix

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