If it is running on one cylinder it would just sound like a single cylinder lawn mower idling. Putt putt putt. Running rough means irregular firing making variable speed and little power. With it running, pull off one plug wire at a time (with insulated plug wire pliers). This allows diagnosis of which cylinders are working. If no change the cylinder is not working. If it dies, or slows down radically it is working. The #2 plug seems to have oil fouling on it. the others look about right for today's fuel, and a few hours of run time. The next step is to assure the point gap is correct, the timing is good, and the mixture is rich enough. If these are good, and the issue persists, check the compression. adjust the valves, and get back to us. Jim
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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