B&S 13.5HP 28T707 motor on the ride-on

Running OK - every time I switched off it would backfire - wasn't worried about that -happens on other motors.
This time I stopped the motor to remove sometime that had got caught in the blades - it popped on stopping like usual but when I went to start it wouldn't - just span and gave encouraging chugs every now and then. Started to smell fuel and it was getting dark so chucked it in for the day. This morning the same so pulled the plug - OK (new anyway) Knew I had an old air filter so took that off and noted the inside of the carby throat was wet. Tried to turn it over and it coughed and shot 6" of flame out of the carby.

Any idea on the problem ? timing? but how can that be it's fixed isn't it?

Last edited by David L; 14/02/10 05:12 AM.