I have a 91 Johnson 50 with a jet on a 14’ boat. It used to run about 4900 RPM at WOT and was smooth the whole way from idle.
A few days ago we were running and on one launch it capped out at 4600 RPM. It would run smooth to 4500 RPM and as soon as pushed the throttle just a tad further to WOT it started hesitating real bad and would only get to 4600 RPM.
I pulled the plugs and they looked fine. I replaced with new plugs and the same thing happened.
I noticed oil dripping from the backside of the cowling now. I’ve only run this engine a handful of times and I don’t remember the dripping but maybe I don’t remember?
How would I go about troubleshooting this? Does it sound like a fuel, carb, electrical, or compression issue?
A few days ago we were running and on one launch it capped out at 4600 RPM. It would run smooth to 4500 RPM and as soon as pushed the throttle just a tad further to WOT it started hesitating real bad and would only get to 4600 RPM.
I pulled the plugs and they looked fine. I replaced with new plugs and the same thing happened.
I noticed oil dripping from the backside of the cowling now. I’ve only run this engine a handful of times and I don’t remember the dripping but maybe I don’t remember?
How would I go about troubleshooting this? Does it sound like a fuel, carb, electrical, or compression issue?
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