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Le 16/04/2013 16:08, Pascal Voury a écrit :

Thank you all for the private messages.
I've been asked what the reason of the failure was.
It will probably be weeks/months before I'll have time to open the engine, then I'll tell the list. Most common failure among friends at those kms is one of the rings that blocks the piston. Then the rod breaks and hammers the cylinder.

Since the bike ate some oil for a long time, I first thought that was that that happenend, but OTOH when it happened the engine rev'd all the time (sorry I miss the vocab.) I mean no rear end slip, no engine stopping.
So I reverted to a valve, since the loud bang happens every crankshaft
revolution. Tom Cutter "seconds the motion", I'll tell you as soon as I do the work.