I know from reading only the ke will run without a battery like most all old 2'strokes.but I can see a bad battery screwing up the works. looking buying one that the owner got the carb setting a.little off blaming it thinking it was the problem. he put a battery in and now it will start but not run presumably due to the carb fiddling. I trust the seller it's just a matter that we all make a mistake once in a while so Itthought I'd ask for input. I hope to pick it up soon either way.