Tommy P. Thinking more about the original problem you requested help on. I think all the basics have been covered by the real experts. My only additional thought is if your father cleaned and sealed the tank and maybe even the fuel lines, it is possible that you are not getting enough fuel to the carburetor. The starter motor on these old girls does not turn the engine over very fast and the fuel pump may not be doing its job. I had a similar problem with one of mine after I redid the fuel system. You might try and pour a little gas or starter fluid into the carburetor and see if that does not get it to turn over enough for the fuel pump to completely fill and supply the carburetor with the correct amount of fuel? Just a thought. Thanks and good luck.