Whoah! Wonder how that happened? At least there's no serious damage, good thing parts for the HS are so cheap!
OK, here's what happened after inspecting the failure. It looks to be a wornout exhaust valve keeper was the culprit. The valve dropped into the cylinder (cumbustion chamber) and nearly reeked havoc on the engine. I ordered a new exhaust valve (and an intake valve as well for good measure), did a little port work and put it all back together.
Went to start it up and no go. Put a little ether (starting fluid) to it and it started right up. Then I put the propane to it and the same thing.....it ran fine. So what does this tell you? It tells you your carburetor is not doing it's job. I pulled the float bowl off, pulled the main jet and emulsion tube and low and behold, found the problem.
The problem; a clogged main jet. Clogged solid with some yellow powdery sunstance. The solution; had to re-drill the main jet. The result; engine runs like a champ now!
It sure is rewarding to know how to do this stuff and it saves a heck of alot of money as the end result. Let's ride!
Those keepers are really hardened, makes me wonder why it wore out so quickly. The guy I bought it from didn't even know it dropped a valve......he say's "it doesn't turn over when you pull the starter" as he's pulling on the starter 
Can't believe nothing else was damaged in the event.....still would have been a cheap fix.
