promac850
formerly promac610
I saw a chain on the bargain table, but it looked too well used.
The Madsen's were trying to figure out how to fix a flippy cap gone bad. It sounded serious. I think there are other flippy cap haters out there.
Now, back to your chain. A timing light? Really. Can't you just put on the reading glasses and wiggle the thingies around?
As per RandyMac's rules for the forum... rule #4 to be specific, there shall not be any wiggling of thingies on the forum...
As for the chain problem, sounds really weird, never encountered anything like that. Maybe the bar groove is too worn out? That's about all I can think of since just about everything else has basically been covered.