Thanks for posting that roebuck, it sounds as if your timing jumped when that engine did a convulsion whilst stopping, which is a classic way to get that result. The ancient car I mentioned in this thread jumped its timing while shutting down also. It "ran on" in Australian terminology, or "dieseled" as the Americans say: hot deposits in a combustion chamber caused it to fire a few shots with no particular ignition timing, after the ignition was turned off. Combined with a worn timing chain, that was all it took. In some ways a toothed rubber belt acts like a worn-out chain, because it can stretch a bit and deform its belt-teeth quite a lot, when it runs erratically. Once a momentary slack develops, it can easily jump a tooth, especially on the small crankshaft sprocket.
I'll close this thread.
