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What is the fuel/oil ratio I should use with my 1980 9.9HP outboard motor? Also what should the spark plug gap be? Any other tips would be very helpful. Thanks.

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  • Dean
    Dean May 11, 2010

    What brand motor?

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  • Contributor
  • 23 Answers

What kind ? Evinrude,mercury,ect
most 50 to1

Posted on Jun 19, 2009

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If i had year make and model I could give you detailed instruction. You can do a few simple test to make the troubleshooting easier. 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 make and model I'm giving you a average numbers. Look at your Clymer manual for exact numbers. 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. It turns to a gummy residue called varnish. It clogs up carberators and fuel injection system. I don't know year make and model so i dont know what fuel system you have. clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under engine cover clean it. mercury fuel injected outboards has a canister fuel filter under engine cover. 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 on fuel delivery 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.

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1 Answer

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