Ok, I got my little Moto 4 80 running. Cleaned the carb, new battery, adjusted the valves, new plug, cleaned the air filter and it fired right up. I let it sit about twenty minutes, started it up again, great. Let it sit a bit more, had a few brews and tinkered with some other shit, went back and it wont start, wont fire up, starter works and all, just wont fire. Opened up the intake valve nut, took a look and the valve backed down, shut. Adjusted it again, started right up, let it sit and just wouldnt fire again, same problem with the intake valve. I tightened the nut on the valve itself tight after I adjusted it, but it just keeps backing down and shutting. Am I doing something wrong? Am I forgetting to do something? Little help please, thanks.
Bob