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• Johnson 50 Hp Outboard Diagram
• Johnson 50 Hp Outboard Motors

We have a Wellcraft with a 50hp Johnson fuel injected engine. It has less than 50 hours on it.

I had an accident (not in the boat) and we had to store the boat (in our garage). We were unable to use it for approx. 1 year, but fogged the fuel and started it about 5 months ago with no problems. Friday, we were all hooked up and ready to go, but I (being around boats since I was a baby) thought it best to back boat out of garage, put the fresh water hose and muffs on and run it for a while just to be sure it would be ok when we got it out on the ramp. It starts and idles fine, however, when I went to accelerate just slightly, the engine blasted to full rpms, I pulled the lanyard clip, it would not turn off, I turned the key off it would not turn off. I, after about 15 seconds kept hitting the lanyard button on the console and it shut down.

Johnson 50 Hp Outboard Diagram

I thought this might be just an isolated problem because it was not out on water for a while. So I tried once again. The same thing happened. I am interested in finding out if anyone knows what the problem could be and how to fix it. Is something 'sticking' in the engine? We have a 5 year extended warranty. However, the dealer who sold us the boat, sold the dealership to a new company who does not handle OMC products.

I was referred to other dealerships owned by the co. Who sold us the boat and motor, one is one hour away, the other is two hours away. They do not seem very anxious to help us, telling me how much money 'they' lost when OMC filed bankruptcy. My question is this.

Has anyone had this problem? It seems like something could be 'sticking' the idle in high acceleration. However, I am stumped by the lack of the ability to turn engine off with either lanyard or key. I am a woman who is very mechanically inclined, however, they do not give much information in the manual that came with the motor. Does anyone have any suggestions on what it could be? Or, perhaps, where I can purchase a repair manual for a 2001 Johnson 50hp engine.

Sorry for such a long question. Any help would be appreciated. Thanks Gonzo I appreciate the reply. I kind of thought it was an electrical thing. I know about the OMC bankruptcy and fortunately we purchased an extended 5 year warranty on boat, engine and trailer with Marine Innovations of Florida.

Fortunately, they were not connected with OMC. It is a nationally recognized program. We live in Florida. This morning I got on the phone and was able to find a Marina that not only services OMC products, but honors the extended warranty (lucky!). I do not know why my original post listed me as 'guest' as I am a registered user here at the forum. I will be trailering the boat to the Marina this week.

I pray it is an 'in warranty' issue and not some type of Maintenance issue as the boat has so few hours on it. Thanks again Gonzo for your reply. Hey guys, about the 2001 50hp Johnson. I found a local marina who accepts the extended warranty. We trailered the boat there Weds. They told us they would call after they did diagnostic tests on it.

Isn't this something that happens to everyone one time or another. THEY COULD NOT GET IT TO DO THE SAME THING.

Johnson 50 Hp Outboard Motors

They called me Fri. And asked if I would come down there on Mon (Labor Day) and they will hook the hose and muffs up to it and they want ME to make it do what it was doing here at home!!! I'll let you know what happens.

I think they did not try to accelerate higher than idle. If they did SURELY it would have surged to full rpms and they would not be able to turn it off. I'll keep you all informed. Perhaps this might be able to help someone else in the future. Same problem here -48hp evinrude carbs cleaned, new carb kits, ran fine @ the shop where i brought it. Starts, 40 seconds idle (sometimes longer, sometimes nothing) back home on the hose it runs like a charm, turn the key it starts and idles fine. But after giving it a little throttle it speeds up quickly and if i throttle back to idle, it keeps running @ high rpms.

Had to turn the key a few times, until it finally stopped.' Anyone an idea, or previous posters maybe some ideas?