I have an older Montgomery ward tractor mower that won't fire. I got the thing for free due to the fact they didn't want to fix it. I replaced the ignition switch, spark plug, oil, fuel lines and filter and put a new battery in it. When I turn the key it chugs as if it were going to start but never does. I'm am out of ideas so please help. It has a briggs and stratton 12 hp motor

Hi,
Can you find the engine's model number tag? You say it chugs, old cast iron engine?
Peace,
Clarke

Hi,
Can you find the engine's model number tag? You say it chugs, old cast iron engine?
Peace,
Clarke

It says it is a cast iron bore. The model number is tmo-33927a/d179h