Good day, I bought a mobylette M1 (bj. should be 1973), it stood for years in the barn was moved by the previous owner but almost never so all parts are still original. At first it did not jump on after which the spark plug was changed it jumped on and ran well even after a longer ride it went out and that start was hard when it was on it started to shake when driving and gave hardly any gas. Now I had them 2 days he stand and try it again today and she went on again a little hard but when she was on you had to give it a constant gas so it doesn’t go off besides she also very shaken and smelled burnt. I hope you can help me to find out that problem.