Hi I just finished mounting a new Kohler Courage sv600 20 hp Engine on a 48" encore. Engine fit in fine, the shaft of engine fit fine in pulleys, and I put in new spark plug, Correct Oil level. I bought a 12v Garden tractor Battery and connected it directly w/ the starter and it Cranks but the engine won't start. I checked everything I can think off and It wont start at ALL. I also checked the fuel pump and it works. Can I get any help ?