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15 hp johnson outboard misfiring compression is 110 both cylinders clean the carb both coils seem to have spark

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Possibly c/shaft seal
ie induction collapse

Posted on Sep 07, 2009


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I have a 50 hp Johnson outboard or do I disconnect the shift linkage to get the lower unit off

have a look at the videos

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Jul 07, 2017 | Johnson Boating

1 Answer

My boat motor Johnson 90 hp will not rev up throttle is wide open have checked coils fuel pump new spark plugs. all good boat sank a few years back. before that ran is a 1986 unit

it sank..ooopppsss...sounds like trouble.. First thing I would do is check the compression with a gauge... This will require a GREAT friend.. remove all the spark plugs - makes PULLING the engine over easier.. get a compression gauge (or take it to a competent professional to get the compression checked!). Install the compression gauge... Put the throttle wide open... have your buddy yank with ALL his heart about 6-8 should show about 115psi+ minimum..all 3 cylinders should be with 10+-psi.
If they are not at these specs have found the issue..then try putting a little outboard oil into all three cylinders and repeat the test.. if the PSI goes way up.. you have found the issue.

Jun 11, 2017 | Johnson Boating

1 Answer

What should the Cylinder Compression be for a 1988 225 Johnson Outboard Model J225 PLCCE. Thank you, MERRILL

100-110 PSI with no cylinder lower than 5% of the highest reading cylinder pressure.

Oct 31, 2016 | Boating

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What could I damage on my boat fuel line? Primer bulb, any filter ... ?

There could be several reasons. I'd first look at stuck floats in the carbs. I believe there's 3 carbs and if all spark plugs are wet all floats are sticking.

But assuming it didn't overheat, and the spark plugs are wet with fuel (as opposed to water) - sometimes a defective coil will short out only when it gets warm (most time they short all the time). They can be tested.

A very good mechanic once told me there are only four things to concentrate on: Suck, Squish, Bang, and Blow. In other words, Fuel delivery, Compression, ignition system/spark, and proper exhaust. My experience has been that I've never had to worry about Blow (knock on wood) with an outboard. Others have however.

Additional advice: The number 1 cause of outboard problems is gas. Todays fuels are great for fuel injected cars but break down sooner than old gas mixtures. Always put a fuel stabilizer in you tank. It's cheap and only takes a few ounces to protect from hundreds of dollars worth of carb work - and avoid sticky floats.

Jul 06, 2014 | Clymer Evinrude/Johnson 2-70 HP Two-Stroke...

1 Answer

Has compression and fire but dont start

Remove sparkplugs and squirt some fuel in cylinders. Replace sparkplugs and start motor. If it fires up you have a fuel problem and a good carb cleaning should clear the problem.

Mar 16, 2014 | Light Outboard Motor Boat Bass Fishing...

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I have a 50hp johnson outboard the motor is turning over but I dont seem to get a spark to the plugs

would this help

Primary cause of hard cold start: operator error.

Open gas tank vent, pump primer bulb until it is firm, raise hi-idle lever full up, push the key in and hold it in while turning it to "start".

If you can flood your engine with the primer bulb, then your carbs need rebuilding. Pump the bulb until it is firm - that fills the carb bowls - they have a float valve that closes when full. This is true of every carbureted 2-stroke outboard ever made.

"Pumping the throttle" is useless - these are not automotive carburetors - all it does is open and close the butterfly valves.

Your motor does not have conventional choke plates; instead it has a primer solenoid, which opens a valve and allows fuel to drain into the cylinders to richen up the mixture for cold starts. You should hear the solenoid "click" when you push the key in.

Bad compression leads to hard cold starts - you should have at least 100 PSI in all cylinders, and the lowest needs to be within 5% of the highest.

If you have good compression and spark on all cylinders, the primer solenoid actuates, and the fuel line holds pressure, then you need to remove your carburetors, dissasemble, soak overnight in carb cleaner, blow out passages with compressed air (or aerosol carb cleaner), reassemble with new kits (including new o-rings, gaskets, and float valves & seats), reinstall, link & sync, and adjust slow-speed mixture

Mar 15, 2013 | Boating

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.

Feb 09, 2011 | Boating

1 Answer


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

Jan 26, 2010 | Light Outboard Motor Boat Bass Fishing...

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 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.

Oct 09, 2009 | Boating

1 Answer

Engine not running

Let it dry out a day or so, perhaps in the sun or a warm place. Try again. If it still won't start, try to find a fuel line or fuel jet and inject some compressed air in to blow it out a bit. Good Luck!

Dec 16, 2008 | Boating

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