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Spark plug gap setting for 90hp 2 stroke yamaha outboard

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: ignition point gap and spark plug gap inboard outboard omc

.019 for the points and .035 for the plugs

Posted on Jul 10, 2009

  • 86 Answers

SOURCE: Spark plug gap 150 hp Yamaha outboard

The correct gap is .035

Posted on Oct 16, 2009

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My 90hp Mariner 2 stroke outboard will only turn over when plugs removed


Hey Bryan,
When you turn the engine over with the plugs out, does gas or other liquids come out of the spark plug holes?
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first things first. Go to supercheap, repco, auto barn and get your self a product called fuel stabiliser ( around $20.00 for about 150mls). I put in a standby generator and it keeps the fuel good for about 6 months. Next the plugs that you want will be a multi point plug (several earth electrodes coming of the earth to the centre electrode or non fouling plugs for the 2 stroke mixture) They will be available from any outboard marine shop. They come in different prices as to quality from around $7.50 to $15.00 for platinium plugs Plugs used in a car engine will not cut it so get the right plugs for outboard 2 strokes.

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0.024
http://www.globaldenso.com/cgi-bin/global/plug/usa/pw/pw-plug.cgi?filename=pw-14.txt

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Yamaha outboard 150 4 stroke bad vibration at 700 to 1200 rpm run great in nuetral and over 1200 rpm what could it be


is you propeller bent? a dent the size of a quarter will cause a shake. If not that means your engine is misfiring. here are the troubleshooting test and tool list you need to find out. Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local outboard dealer. I know all these are expensive but if your going to be a outboard tech you will always need them. Troubleshooting (1) check compression. without the year model I'm giving you a average numbers. Look at your Clymer manual. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine times out of ten.Ethanol gas is proven to stay stable in fuel systems for 30 days in 90 + degree heat. Drain gas tank,clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under engine coul clean it. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a outboard. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive boat, if the problem is still there then there is further steps to take. Again I don't know the year model so I guessing its fuel injected. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your outboard. Troubleshooting tips and teaches you how your outboard works.

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I need the spark plug gap for a 2001 Yamaha 115hp 4 stroke outboard.


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