I have an x748 with the yanmar. The fuel shut off solenoid on mine bolts on with 2 bolts, it has a pin or needle that sticks out on the end that goes into the pump. This is spring loaded to push against a plate on the inside of the pump when key switch kills power to the circuit. There is a relay that sends power to the solenoid electromagnet to pull the pin back to allow the machine to run. you can take that solenoid off and start the engine, it will leak oil out of the hole but will let you know if it runs or if you have another problem. If the engine runs with no solenoid then you have a relay problem or an issue with getting power to the solenoid. It doesnt have any fuel to it so doesnt need bled. If you think its a fuel issue then start with the filter housing connections and work your way back to the tank, low air pressure applied from the supply hose at the filter might help you find any leaks you might have. The relays on these things are a bugger to diagnose, i converted mine to a manual shut off. As for the long bolt i dont know wht it is or how its adjusted but based on what you said i would say its just a bump stop for the governer to limit rpms, if its out i would have something to put over the air intake if it starts as it might open up without that bolt in place.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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