Well, got three days of good riding in on the new to me Montesa. It decided not to stay running about mid week. My Dad popped over tonight and we went through the carb, cleaned out all the jets and it appears the slow jet was clogged. This led us to discover an over abundance of oil in the air filter box and on the air filter. Cleaned all the oil up and squeezed the excess out of the filter. Slapped in a new spark plug, put the carb back together, and it was back to running good!
Now I can get on those off camber turns tomorrow. Can't wait!