I have a Murry riding lawn mower that I had not started up in about 6mo. I tried to start and it cranks but will not start. I've checked the spark plug, gas level, fuel filter, air filter. Again, it cranks but will not start. I am look at that the air/fuel mix is not getting to combustion chamber. Any ideas anyone.

If you've been parking it all winter with fuel in it... the carb needs a through cleaning. Its got a varnish buildup in the jets.