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20 hp evinrude boat motor will not start

I sunk my boat, flush motor, put new plugs in its getting fire to plugs,because i held onto plug wires and got bit i have pulled and pulled but does not even try to start

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  • bwwatson May 11, 2010

    you said you flushed the moter, did that include pulling the carb off and cleaning?



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Broke key off of ignition trying to jump over, can't find wire to keep motor running, will start, but not stay running cause wired to toggle switch. can u help, please thanks, wayne (20hp johnson/evinrude

Posted on Nov 08, 2009

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I usually don't recommend starting fluid but some brands have oil with them. You may have to dry the cylinders by getting them to fire with starting fluid.
You may have something else wet and grounding. Before using starting fluid spend some time with a hair dryer and try drying out the motor. Leave it sit in the sun with the cover off.
You should drain the carbs, drain the fuel line and gas tank.

Posted on Aug 04, 2009


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evinrude 1978 -1979 have a capacity discharge ignition unit as the control for the spark system
it runs wires to an ignition coil
so I would be suspicious of that unit
check all connections for corrosion and bad connections
I typed in electrical schematics for 1978 evinrude out board engine and found a site which in the list of schematics has 55hp 1977-1978
press on that and you get a schematics of the wiring diagram evinrude 1978-1979 55hp
now I am aware that you state that yours is 35 hp but if it has 2 cylinders then it is a fair bet that the wiring diagram will be the same
any way there are plenty of other sites that may be of benefit

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With this little information I would say you are not hitting on all cylinders. The motor not you. Pick up a plastic fuse pulling pliers at a hardware store. Start the engine on a flush and remove one plug wire at a time and listen to the drop in engine speed. If there is no drop, the cylinder is not firing. It helps if you remove and reinstall the plug boots before you start the engine as they can be hard to remove. be careful, the spark can hurt.

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Quick pull the spark plugs and fill with any kind of oil-(WD-40 works best) Then look down the carb and dump a cup down the intake and spin it over by hand till it is free(still no plugs). Finally spray wd-40 up under the flywheel. Physically shake the motor. Spin with the starter to clear the motor of water.

WITH A FIRE EXTINGUISHER handy. Put in a trash can with water and clean fuel and try to make it start. If it starts, keep it going for 1/2 hour to get it warm and dry out the insides.

If you ever can't work on a sunk motor for a day or two, keep it sunk do not try and dry it with out oils and leave it where the air can get to it for even a few hours.

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get a spark tester that has 2 leads and test spark .

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What is the correct fuel/oil mix for evinrude 4hp ?

the proper mix is 50 to 1 or 16 oz to every 6 gallons,in my little boat I put 4 quarts in the 48 gal tank and its been running for 22 years,your running way to rich and your plug is probaly fouled,take it out clean it up/dump your fuel and mix it right,thats a great motor you got,I hunted with it for years,oh yeah when you get started run it till all the smoke is gone or you will have carb problems ,if you dont have them all ready,a little carb cleaner wont hurt but get it running first,or all that trash will foul you out,have a great trip bartriley1

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