I have a 26 cc gasser that will not run more then a few minutes. After a lot of work I tend to think it is the battery/spark plug combo. I am using a 4.8 volt 1100 mah battery and a spark plug from napa that matched the one That was in it. So my question is this, Is there, and should I be using a special sprak plug other then what I have?

I have found that the engine will run for a minute or two and quit and will not start again unless I put a new battery in. I have cycled the batteries and they apear to be in pretty good condition.

Thanks for your help.