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I have a 1996 johnson outboard that will not start,ive put new pistons abd rings in it,new power pack,coil,rectafr,stator,rebuilt carb,fiel pump and cylanoid and still wont start.

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Some other things that you need to do are check the fuel to be sure that it is ok.
Check the timing
Check the compression and to do this I prefer a cylinder leak down test.

Posted on Apr 01, 2011

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Posted on Jan 02, 2017

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My outboard motor locks up, then I turn it backward by hand and it runs until it locks up again. can't find what is wrong with it


OUCH... ok.. do not try to start it again.. you can and will cause more damage! Is it in gear when you are turning it backwards or trying to make it run? (need to eliminate drive line issues)
How long with it run after you turn it backwards? ..will it actually run or just turn over? (turning an outboard backwards will damage the water pump impeller!!)..its something you need in perfect working order!
Remove the spark plugs.. see if there is anything on them except a little carbon....We are checking for damage to the piston/rings area. If there is anything on them but a little carbon, you have found the problem area...
If they plugs are clean, (and NOT new).. then you need to check further..You will need a GOOD mechanic to help you.. I would pull the flywheel to make sure you don't have any broken magnets/stator damage.
If the issue is NOT in the lower unit...then its in the power head. Take it to a professional mechanic.
Repost/reply with more info on what you have done.

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1 Answer

How do I replace the thermostat on a 1999 Johnson 50 hp outboard.


Thermostat on a 1999 50 HP Johnson is easily replaced. It is located at the top of the cylinder head at the top rear of the motor, just above the spark plugs. The thermostat also functions as a pressure relief valve so when you remove the old thermostat make sure there is no debris, (shell, weeds, etc.), where the thermostat seats. If there is anything preventing the thermostat from sealing the engine will run cold at low speed. This is a problem because it will cause a lot of carbon deposits in the combustion chamber. Eventually the carbon deposits will cause the piston rings to stick in the piston hindering their ability to seal to the cylinder wall. This will damage the cylinder and the piston and the engine will need to be rebuilt. Replacing the thermostat is easy to do. Make sure all components are clean and use new O-rings and/or gaskets.

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I have no spark on 1989 7.5 evinrude outboard motor


Hi have you tried it with the stop switchl/button disconnected, if so you have only got the stator under the flywheel left to replace, regards Phil.

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1 Answer

My 1988 ( i think) 6hp Johnson outboard motor is always hard to start if it is cold. It can take 10 - 15 minutes of pulling on the cord to start it when cold but will start first go every time once it has...


I would suggest you replace the 2 coils. Also, is choke closing properly? The carb if never rebuilt, could cause this problem. A carb kit and 2 coils should not cost much, maybe 20 each for coils and 17 for carb kit. Make sure carb is adjusted properly with outboard in water and warmed up. Mixture screw should be turned in slowly clockwise until engine just pops(lean). Then slowly open it apprx. 1/8 turn. This will aid engine in starting next time. Also, make sure primer bulb firms up when squeezed.

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1 Answer

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1 Answer

25 hp outboard 1996 Johnson. Rebuilt fuel pump and motor will start and not keep running ? Did this last year too . Thought the fuel pump diaphram would be bad ? Looked good but I changed out everything...


you need two tools, a compression gauge and a spark gap tester. min 100 psi compression but cylinders have to equal each other within 6%. the spark has to jump the spark gap tester a half inch. If the engine passes those two test then fuel is most likely the issue. ethanol gas is reported to only stay stable in carburetors for 30 days in 90 + degree weather. So cleaning the carburetors will be the next step.if you havent cleaned carbs before. Take pictures of the hoses and linkage before you start disasemble carbs from engine. when dissembling the carbs be very careful. There is a parts breakdown at www.crowleymarine.com. click on parts catalog and click on the product line tab then year tab and horsepower tab. after cleaning and reasembling the carbs to the engine sync the carbs to where the throttles open and close together. look at the pictures you took make sure you put everything back.

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1 Answer

Merc outboard 115HP 1996 fuel primer/Choke


Hello there
here is a good place to start ok Outboard (wiring A Tachometer To An Outboard, Mercury Outboard Float) safe.gif
merc outboard motors mercury outboard ... diagram of mariner outboard motors johnson outboard fuel problems ... johnson outboard motors ebay 1996 115 hp mariner outboard
  • tipsterdatabase.com/mods.php?id=outboard
  • · Cached page

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