I have a LT 155 that won't start. It has a Kohler CV15S engine. I have 100 PSI compression. As you crank it goes to 30, 60, 90 + PSI max . Checked the fuel pump for flow. Removed and cleaned the tank. New Fuel filter. New ignition coil. Removed the kill wire. Set to .005 gap. Has spark. Even tested with a functioning coil off another tractor . New Plug. Replaced the carb. Changed the filter and replaced the oil. Even with starter fluid she will not kick. . . Get a good backfire a couple times. Any ideas? I'm at a loss.