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.025"
you should be using multi discharge point plugs in out board motors -not regular car engine plugs and the gap is preset on them
the reason being , with multi point discharge they are less likely to foul from oil and carbon build up
available from any good auto parts shop or marine shop
if the plug is a standard plug as used in a car , it is the wrong plug
the plug to use is a multi point plug or anti foil plug and the gap is preset
single point plugs such as used in cars motor mowers etc , foul up from the oil / fuel mixture that deposits carbon across the gap so the use of a multi point anti foul plug is recommended in outboard engines
if you persist , for an conventional magneto /coil operation .025" and a later electronic ignition .050"
not enough info. what Manufacturers and model? is it out of warranty? here are some troubleshooting tools and procedures since labor rates at your local dealer could be up to $100.00 per hour. before you start I have two Goals for you. (1) If you learn everything you can about your engine you will become more confortable and enjoy it more. (2)confirm that your engine is ok now. is the noise your hearing piston related, or is it ignition missfire. the compression check and the ignition output test will help answer that. 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 Manufacturer I'm giving you a average numbers. Look at your Clymer manual for specifics. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark output. use a spark gap tester. all cylinders should jump a half inch gap. If all these test prove that the basic operation of the engine are within specification, then we can turn to fuel delivery. unfortunately you didn't give the Manufacturer so I can't give you the troubleshoot procedures for the fuel delivery system. you will need to refer to the manuel. please get Clymer manuel you will apreciate it
has your boat been sitting more than 60 days. ethanol gas has been proven to only stay stable for 30 days in 90 degree + weather. Labor cost can be up to $100.00 per hour. CHEAP TEST- compression, spark, and fuel. 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 model I'm giving you a average numbers. Look at your Clymer manual for specific 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. Drain gas tank,clean fuel lines replace primer bulb and replace all fuel filters. 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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