I recently purchased a used 60" Exmark propane powered mower. (Got a great deal on it). The problem is it is a PAIN to start. I got it started a few times but now it wont start at all. It has spark on both plugs. To even start it, you have to start it with propane off, then turn it on when it starts. But, like I said, now it wont even start! This is my first propane powered unit and I'm not familiar with these systems. It has a Kawasaki FH680V engine, 23HP.