JOHNSON 90 HP OUTBOARD

[MOMO]

WHEN I TRY TO CRANK MOTOR ELECTRIC START, MOTOR WILL JUST TURN OVER, BUT WILL NOT FIRE. POSSIBLE ANSWER TO THIS PROBLEM. THANKS !!!

 

[SpinnerBait_Nut]

Re: JOHNSON 90 HP OUTBOARD

Johnson/Evinrude forum.

 

[ezeke]

Re: JOHNSON 90 HP OUTBOARD

Johnson 90HP Models run from 1964 on. Which year was yours built?<br /> 90 HP Johnson Models <br /><br />Please turn your cap locks off.

 

[Silvertip]

Re: JOHNSON 90 HP OUTBOARD

Did someone pull the kill switch lanyard? Have you checked for spark? Did you just acquire this motor? What's your starting procedure?

 

[MOMO]

Re: JOHNSON 90 HP OUTBOARD

Originally posted by ezeke:<br /> Johnson 90HP Models run from 1964 on. Which year was yours built?<br /> 90 HP Johnson Models <br /><br />Please turn your cap locks off.

Year 1996. Do you think it might be the plugs? The guy I bought from said they have not been changed in a while. What gap do I need to set plugs. Thanks !

 

[andy6374]

Re: JOHNSON 90 HP OUTBOARD

It could be many things!!!<br />Do you know the history of the motor, maintenance and all?<br /><br />Step back and test some basics and report back.<br />-Take a compression test<br />-Check for spark on all cylinders<br /><br />If this checks out look to the fuel system. If it has been laid up for awhile the carbs will need to be rebuild, probably the fuel pump too.

 

[ezeke]

Re: JOHNSON 90 HP OUTBOARD

Fuse ok? It's next to the starter solenoid.

 

[MOMO]

Re: JOHNSON 90 HP OUTBOARD

Originally posted by ezeke:<br /> Fuse ok? It's next to the starter solenoid.

Fuse is ok. The motor was doing the same thing toward the end of last summer, but after turning switch and trying several times it would fire up. This year it just sits and turns over, but will not fire up.

 

[Dave Abrahamson]

Re: JOHNSON 90 HP OUTBOARD

Originally posted by MOMO:<br />but after turning switch and trying several times it would fire up.

Just a wild guess here...but I'd start by making sure the ignition/kill switch isn't the culprit. There is a big red "cannon" plug on your motor. Unplug it and check spark. If you try to start the motor and it does start, you will have no way to shut it off with that plug undone other than manually flooding it with the primer.

 

[MOMO]

Re: JOHNSON 90 HP OUTBOARD

It seems if it was kill swith the engine would would not be turning over.

 

[Dave Abrahamson]

Re: JOHNSON 90 HP OUTBOARD

Things aren't always as they seem. The starter would crank the motor but there would be no spark for ignition. Check the individual spark plugs...they need to jump a 7/16" gap with a hot thick white spark.<br />Might be a good idea to get a factory manual. Tons of info with pics.

 

[ezeke]

Re: JOHNSON 90 HP OUTBOARD

Try taking ALL* of the plugs out and see if you get spark just attaching the wires and placing the plugs against the block. <br /><br />(Its really not a good idea to hold them.)<br /><br />* This eliminates the compression and speeds up the RPM.

 

[MOMO]

Re: JOHNSON 90 HP OUTBOARD

Thanks !! Boat is down at the lake. I will try above and get back.

 

[MOMO]

Re: JOHNSON 90 HP OUTBOARD

Well I changed out all plugs and motor still will not fire. Anymore suggestions. Thanks !!

 

[Dave Abrahamson]

Re: JOHNSON 90 HP OUTBOARD

Have you tried any of the above? No one said change plugs. Are you even getting a spark?

 

[emdsapmgr]

Re: JOHNSON 90 HP OUTBOARD

Check to be sure the primer solenoid is working.