SOURCE: John Deere 14SB (with Kawasaki FC150V motor). It
sounds like the valve clearences need adjusting they should be set at 0.004 thou you should be able to find an exploded view at pats small engines site.
SOURCE: My John Deere 345 dies for no apparent reason
You have dirt in the fuel tank and it sucks the dirt up on the filter that is attached to the pump. After the machine stalls, the dirt falls off and it will restart and run for a few min.
SOURCE: john lawn 345 lawn tractor runs for about 30
something is either heating or plugging up and causing fuel starvation.
SOURCE: on john deere 345 18 hp kawasaki liquid cooled
Water pump gear or the water pump impeller could have failed. If its the pump and due to it being at the bottom front side of the engine it would take some time for it to boil due to the fan is always pulling air down thru the radiator and its at the very top of engine. Cool water on top and really hot coolant around the cylinder with sensor. I'm sure it's the pump.
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