I have an older walk behind edger that won't start. It ran last year, but I used it so little, that I didn't even prep it for winter (it sits in the back of the garage and kinda got forgotten about). Now I need to use it for a new edge and can't get it to run. It's a B&S 3.5hp. I put a new plug in, that didn't help any. I'm going it empty out the old gas and put fresh in, but I kinda don't see that solving the problem. The air filter is fairly clean (like I said, used very little). What kind of things should I be looking at and trying? I'm not the most mechanically inclined person, so speak slowly if you know what I'm saying! ;-) Thanks.