My old man had a spare head sitting around, so I was able to see where the advance mechanism is located. I'm hoping I don't have to dig into mine that far quite yet.
I've cleaned pretty much every electrical contact on the bike. I had the wire harness off the bike completely last week, inspecting and cleaning all components (starter, coils, rectifier, and all male to female connectors). The harness is back on, correctly (after I blew a fuse or two of course). Either way, start up doesn't seem any better.
I've tried a few different spark plug cables, and currently have new 7mm copper core on right now. Plug caps are new (NGK LB05F - 5 ohm). Plugs are NGK D8HA.
New condenser should be here early next week.
Arcing Points
I beg to differ about the possibility of a timing differential with the 305 advance unit. If the advance weights are not moving smoothly or the advance springs are worn, it could happen. Perhaps using a timing light on each set of point with the engine running would provide useful data.
Come to think of it, a loose timing chain could cause a timing differential as well. As these relatively simple engines near 50 years in age, parts are wearing and changes out of spec are gonna have an effect. Minor wear to several parts can add up.
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