Re: Johnson Ocean Runner peaks at 5000 RPM
Assuming these engines are propped the smae and driving the same boat as a pair I would perform a spark test on the engine and insure you're getting fire to all of the cylinders.If that checks out ,a compression test would be next.All good there?May be fouled carburetors or a fuel delivery issue.Throttle linkage allowing for full opening of carb flaps?Did all of the sparkplugs look consistent in color and condition on the engine in question?