twin cylinder onan engines can run on 1 cylinder, and still run as smooth as if they are running in two. Until you put a load on them, then the RPM drops due to low power. Check spark on both cylinders. Some models used a single coil with 2 plugs and one side can go bad. Most engines can be converted to run 2 coils, 1 per cylinder cheaper than trying to buy that special 2 cylinder coil.
It might be as simple as a fouled or bad plug or plug wire.
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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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