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Posts: 179
Location: Wisconsin | Any good suggestions on where to take a 1989 Evenrude 120HP out boards to.
Just want someone to go over it and make it run at its best. I'm just out side of Milwaukee.
It does not have to be a shop or dealer. It can be someone that does it on the side.
Thanks | |
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Posts: 32914
Location: Rhinelander, Wisconsin | I'd take it to Marine Diversified. They have a guy who specializes in parts and service for the old Johnson/Evinrudes. 262.206.3045, ask for Mike. | |
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Posts: 3504
Location: Elk River, Minnesota | Wanna pull it to the twin cities? I'd help if you were in town...
Steve | |
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Posts: 3504
Location: Elk River, Minnesota | Donnie,
Come to think of it, if you can do basic mechanical things, you can do the maintenance yourself and save lots of $$.
Here is all you would need for a quick tune up and prep for the year:
One can of OMC/Bombardier decarbonizer
One can of Seafoam
4 spark plugs
Fuel filter
Lower unit oil
Replace the lower unit fluid
Fill the tank with fresh gas and dump in the can of seafoam.
Second, go to the can of decarbonizer. If you have a spot on your motor behind the carbs (front middle) that looks like a tire valve stem thread, you are even better off. You can get a small hose that attaches to the can which will directly thread on that stem for decarbonizing. Hook up the can of decarbonizer to that threaded end. Put the motor on muffs in the driveway, start it up and let it get up to temperature (about 5 minutes or so). Set the throttle to a high idle 1500 rps or so, and start shooting squirts of decarbonizer into the system. The motor will start to run rough and blow white smoke. Continue doing this for a couple of minutes without killing the engine, then spray continuously until the engine kills/floods. Keep spraying a bit longer to really douse the combustion chamber with decarbonizer. Then, go relax for about 20 minutes to an hour.
After the motor sits, take it out to the lake or river and run it till it is clean of white smoke. To begin with, you will have a huge white cloud. What you are doing at this point is blowing out all of the carbon build-up along with the decarbonizer. After this step alone, you should find your motor running much smoother throughout the RPM range.
Next, replace the spark plugs. I have found Champion plugs to run best with OMC engines, and I believe for your motor you are either using QL77JC4 or QL78YC. They are somewhat interchangeable, but if you know exactly which one it takes, I would stay with those. I always replace the plugs after decarbonizing as I would rather foul up an old plug rather than a fresh one.
After you have run your tank down that had the seafoam added to it, replace the fuel filter. Fresh gas from there.
Also, I would assume you have VRO system with that or has it been plugged off and you mix? Either way, I would suggest (if you have not already switched) going to a good synthetic blend of oil. I use Amsoil HP Injector oil in my engines since it burns cleanly without excess smoke which is what I always seemed to find burning Johnson oil.
The synthetic will burn cleaner, thus you will be less apt to foul a plug or two if you troll a bit. It doesn't rule out fouling, but it does help tremendously.
These 3 things alone should get your engine running really well. Carb adjustments on that engine are a little more tricky as there are 4 carbs that need to be synchronized for air/fuel mixture for optimum performance and not to be running rich or lean on one cylinder as it compares to the others. That can be a bad thing...a very bad thing...
Great motor!! Strong!!
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Posts: 179
Location: Wisconsin | Thanks a lot VMS. I will do that. | |
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Engine Work