OMC Johnson questions

[AlabamaRan]

" Joe,
All us out here very m

" Joe,
All us out here very much appreciate you freely sharing your vast knowledge of these OMC creatures (which they seem to be at times). Now to my questions. I have a 70' model 9.5 Johnson(we have discussed some things obout it before on here). Well, the carb has developed some problem(s). It was running pretty good, sometimes bogging and dying on the low end but sometimes not. Now it won't stay cranked. I prime her, choke her, crank her, then she dies and won't hit again. The primer bulb is still pretty firm though. I can wait a good long while and it will do the same thing again. I expect it is time for a rebuild, but I have never done one.So let me just lay out my questions:

1. Is there anything I can put into the carb right now to maybe clean the thing without pulling it off the motor? (I am about as bad a mechanic as they come)Also, I heard it might help if I put a little pure gasoline down the carb, pull the plugs, and slowly push it through the cylinders.

2. How is the best way to prevent the thing from varnishing/ gumming if it is not going to be cranked in a month or more? Particularly, when the motor is put away for the Winter.

3. Can carb adjustments be made with the engine in a barrel of water, or using muffs? (I am a bit handicapped and am not sure if I can work on this thing in the open water, especially if it requires adjusting at WOT)

Accept my apologies for asking too many questions at once, but I want this little motor to perform its best and not leave me stranded in the lake. Thanks again for all you do for us who come looking for professional advice.

AlabamaRan "

 

[joereeves]

"Alabam..... Answers to your q

"Alabam..... Answers to your questions by number as follows:

1 - No, there's nothing you can run through the carb to clean it. It is necessary to remove the carb and clean it properly.

2 - If the engines going to be sitting for a month or two, run it for approximately 15 minutes every two weeks, either on a flushette or in a barrel. This will keep the fuel mixture flowing through the carb and should keep it from gumming up.

2a- Winterizing is best done by purchasing a spray can of fogging solution from your marine dealer (or whoever). With the engine running at as fast an idle as possible, spray that solution into the carburetor throat until the engine dies out. That will coat everything internally to prevent rust, keep the piston rings from sticking, etc. Remove that 7/16" hex head bolt from the bottom front of the carb and drain all the fuel out. Stick the flexible nozzle of that fogging oil spray can in that hole and give it s blast, then put that bolt/screw back. That should keep the carb from fouling over the Winter. Remember to drain that fogging oil out of the carb before you attempt to start the engine. Note that this "Fogging Oil" that I speak of may be called something else.... ask your dealer about the winterizing solution.

3 - The high speed jet is a fixed brass jet and there is no adjustment there. You can adjust the idle slow speed needle valve with the engine on a flushette or in a barrel.

Joe

"

 

[AlabamaRan]

" Very Much appreciated Joe. T

" Very Much appreciated Joe. Thank You, but I know I'll be asking more stuff when it comes to mind. Have a Great Day! "