I bought a 1980 Honda Express last week for my grandson. It wasn't running correctly when I got it home so, I cleaned the carburetor. The next day my grandson rode it for 1 1/2, everything seemed fine. The next day it would start but will only run for 30 seconds and then dies. I cleaned the carb again. Still does the same thing. I have tried all the tips that I could find setting the carb. Any other suggestions would be greatly appreciated. Thanks
Merle