Well, I took Tonk out for a shakedown cruise the other night just to see what was going to break. Got about three miles running fine & without so much as a Howdy-Do the engine died, just cut right off without even a stumble. OK- I figure electrical or fuel- no problem, just something stupid i forgot to tighten. I try restarting & no spin- just a clunk noise from the vicinity of the starter- oops, problem #2. So I call the tow truck & back to the garage we go. Next day I start the forensics by pulling the bum starter, just for fun I shot some juice to it & after a few jolts it starts spinning Just to double check I try spinning the engine manually- engine no turnie Crap I pull the plugs & look in the holes with a bore scope- no valves in places they shouldn't be. I pull the oil pan- all the pistons & rods are right where I left them, the portions of the cylinder bores that I can seem look perfect. I loosen the front main cap, still no turnie. I loosen the middle cap, still no turnie. I loosen the rear cap, crank turns about 2 degrees- reluctantly, with a "clunk" noise at one of the sweep. I loosen the back cap some more- crank now goes back & forth about 5 degrees, reluctantly, with a good healthy "clunk" noise at one end of the sweep. I pull the rear cap- The scoured part of the journal appears , according to my calibrated thumbnail, to have grooves about 2-3 thousands deep. Lower bearing shell- Look closely & you can see some of the metal grit that was in the groove. The crank now turns about 10 degrees, reluctantly, with an even better "clunk" at one end of the sweep. This thing was "professionally" rebuilt & I checked the mains clearances myself- they were all 2 - 2.5 thousands. This weekend I'll pull the engine & yank the crank to see it there's any other damage. Anyone got any ideas about what happened? H.