Hello I am new to the forum thing so bare with me. I just purchased three tractors none of which run. The first two are 5065M one is parts and the other one I think will run with a few parts. The third is a 5325 that will run with a few parts. So I started with the 5065M that I put a new fuel filter/primer pump and a few others small parts on. It will crank but won’t run. Where should I look first. I have fuel going through and smoke like it wants to start but won’t. Any help would be appreciated.