Back to the Original Posters question. First of all if the battery requirement is 4.8 to 6 volts, His battery is fine.

Look, the engine sat up for a year. Be real about this and buy new gas and run your engine at 32:1 ratio or whatever you are comfortable with. The engine you have likes to overheat if it is not vented properly and not set up on the needles correctly. This is aconverted glow togas motor and since the last time it was run I am sure the conditions have changed.

Take a tachometerr and readjust the low and high end settings to make sure you are not running too lean. Double check youor timing as well (28-32 degreesBTDC).

If you decide to rebuild your carb make sure the reeds are put back on exactly the way they came off. They do not like to work backwards.

E-mail me if I can help you out further.

Glenn