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 - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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