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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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