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Won't idle

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Marcy69

New member
Hi I have a 1994 15hp evinrude short shaft outboard. I can't seem to get this thing to idle, it does run when I give it throttle but as soon as I let off the gas it Boggs down and dies. I have rebuilt the carb, new fuel pump and a new coil pack. For some reason I can't seem to get it to idle even when trying to adjust the carb it still will die on me. I am at a stand still any advice will help greatly. Thanks
 
How long have you owned it ?----Post the compression numbers.----Then check for spark on each lead.----Spark must jump a gap of 3/8" or more.---Why did you install a new " coil pack " on this motor.----Perhaps check the flywheel key too.
 
Hi. I had same problem with 1986 johnson 15hp,they almost same engines,just yours has larger cylinder bores. My problem with it was similiar to yours,it just wouldnt idle normally,it would stay running at arround 1500 rpm,a little less and it died.
I rebuilt car 2 times,new fuel pump,spark plugs etc,but still no luck. Compression was 100 psi on both cylinders. Problem is that on the 2 stroke engine,good compression reading does not mean it is 100 % healthy,because there is one more type of compression,that cannot be measured,it is when piston travels down after cumbustion and by traveling down it pushes fresh portion of fuel mix into cumbustion chamber. I my case piston rings were quite worn and end gap on them was .027" on top and .024" on the bottom,way to big,should be .005 to .015.
New rings and honed cylinders sorted that problem for me.
 
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