I guess expecting reliability from a 49 year-old un-rebuilt engine is unrealistic. I was happy so far as I’ve only addressed cosmetic issues and suspension. My luck has run out.
I was on my way from the licensing office to work on my first “legal” drive. Was doing about 60-65km when I lost power and then the rear wheel locked up. Pulled the clutch and pulled over, the engine turned over but it feels like compression is down, although there is compression. With two cylinders and a shared space it is difficult to tell which cylinder has an issue.
Question now is, full rebuild? Source of the problem? Lean carb, oil delivery – cable or pump? The bike was running great a few days earlier and did the same stretch of road no problem.
This might come in handy when I get the head off, it shows how to read the piston damage from a seizure.