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Spark plug gap 150 hp Yamaha outboard

Need spark plug gap for 2003 Yamaha outboard 150 hp motor.

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  • Anonymous Mar 29, 2014

    Yamaha 150 HP outboard

  • Mike Mitchell
    Mike Mitchell Sep 12, 2014

    I have 1994 yamaha 200 H.P Jet, I run NGK BR9HS and it calls for gap at .058 - .063...

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  • 86 Answers

The correct gap is .035

Posted on Oct 16, 2009

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Posted on Jan 02, 2017

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  1. Fuel
    • A common problem with an easy solution, Yamaha boat engine trouble could arise due to inadequate levels of fuel or engine oil. All Yamaha outboards take unleaded gasoline as a main fuel source with a pump octane rating of 86 or higher. The type of engine oil varies according to motor size and can be found in the "Specifications" section of a particular outboard's owner's manual (See Resources).
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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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need year and make? Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer). I know all these are expensive but if your going to be a outboard owner you will always need them. Troubleshooting (1) check compression. without the year and make I'm giving you a average numbers. Look at your Clymer manual for specific specs. 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 only 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 cowl 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 make so I guessing what fuel injected system. 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. without the test information I would guess the electric fuel pump. but test everything first because a mercury efi fuel pump will set you back 600.00

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