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 - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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