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  Topic Review (Newest First)
01-18-2013 03:38 PM
Re: Outboard Issue

Should you run into this again, you can get a rebuild kit for most carbs. It's also unusual for a carb that small to have problems that can't be solved with a rebuild, or often just a thorough cleaning.

I inherited a circa 1971 Johnson 4 hp from my Grandfather. It had sat in my grandparent's basement, unused, for over 20 years. I pulled out the carb, completely disassembled it, and cleaned all the parts with carb cleaner. The bowl, as I suspected, had not been drained after the last time it was run, and the residual gasoline had become a thick, jelly-like mess. Soaking a few hours and scrubbing a bit removed it. Reassembled and installed the carb, put a new raw water impeller in the lower unit, hung it in a barrel of water and it started on the 4th pull. I still use it on the 14' aluminum boat that it was purchased with.
01-18-2013 03:32 PM
Re: Outboard Issue

Plus 1 on the Seloc manual. My Evinrude 9.9 is the same age as yours. Good book. Found a bunch of stuff online, through many searches, and filled a 5" thick notebook with material.

Do the plugs, and clean the carb. Did that myself, still had problems, only to find a small leak at fuel line connector where it attached to the motor.

Best of Luck!!!!
01-18-2013 03:14 PM
Re: Outboard Issue

I finally caved and took it in to a local small engine repair shop. Turns out the carb was completely shot, and needed to be replaced. But at least now I will have a reliable engine. Thanks for all the tips and suggestions!
01-13-2013 08:25 AM
Sea Dawg
Re: Outboard Issue

Originally Posted by Minnewaska View Post
That only leaves compression.

OMC Outboards are reliable and simple when you address the basic things, so something simple may still be wrong. I had a head gasket leak recently and behaved similarly due to introduction of water in the combustion chamber. Shine a flashlight in the spark plug hole looking for water droplets. On mine the tiny droplets showed on the spark plug and wouldn't burn with a match. You can get a pinhole leak in the plug wires. Very common under the hold down clamp. Judging by the tiny black burn mark my guess is for some time the motor still runs. One time a friend had what appeared fuel problems and after trying everything, he pull the built in tank and found a june bug had crawled in the vent. Another tough one was a friend had a rust hole in the tank suction line in his car. Ran great as long as the tank was full. Some quirky thing will be found and you'll have a great little motor.

Good luck!
01-13-2013 12:51 AM
Re: Outboard Issue

Originally Posted by JMN412 View Post
Yeah it could very well be the choke. The is the one thing I haven't checked yet. What is the best way to go about checking the choke mechanism? What should I be looking for?
With the breather cover off, activate the choke lever.. you should see the little damper plate actually move from mostly closed (choked) to off (wide open). These levers usually just hook into the choke arm, or snap on so it's possible it's come adrift.... but it is just one possibility left after what you say has been dealt with..
01-12-2013 11:58 PM
Re: Outboard Issue

Yeah it could very well be the choke. The is the one thing I haven't checked yet. What is the best way to go about checking the choke mechanism? What should I be looking for?
01-12-2013 07:01 PM
Re: Outboard Issue

Possibly, the float level is incorrect? Or, weak fuel pump? Sounds like it is running out of fuel at low speeds? You might try a seperate tank or vessel of fuel with a seperate fuel line, with no squeeze ball in it, held above and directly to the carb. If that works, it could be the pump or the tank/hose system. 2 strokes love NEW plugs.

Paul T
01-12-2013 06:32 PM
Re: Outboard Issue

Is the choke mechanism working properly??
01-12-2013 06:29 PM
Re: Outboard Issue

Originally Posted by JMN412 View Post
.... It has spark, air, and fuel. What else could I be missing?
That only leaves compression.
01-12-2013 06:05 PM
Re: Outboard Issue

The engine is just unreliable. It doesn't start every time, but when it does it will idle for between 10 seconds to about 2 minutes. When I rev it up it runs longer.

I gapped the spark plugs, so thats not the problem. I cleaned the carb, so thats not the problem. Fuel lines are clear, and the bowl drains fine, so thats not the problem. It has spark, air, and fuel. What else could I be missing?
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