JD JX75 won't stay running
I've got a John Deere JX75 mower that's about 5 years old. I'ts got a Kawasaki 6.75 hp engine. It's been running great ever since it was new, except for yesterday. I lifted it up to put on a couple saw horses to change the blade from standard to mulch. I put it back on the ground, serviced the fuel tank, and started it up. As soon as I take it off choke it quits. It will only run with the choke on, and it runs fine with the choke on. I know the blade swap has nothing to do with this problem, but what could it be? The owners manual says nothing about a fuel filter. Any ideas?