SOURCE: Yamaha 115hp 2 stroke Outboard Boat Motor. Went
is it carbureted or fuel injected? are your warning horns working? if it iscarbureted then a few easy test can be done to find out. if its fuel injected then its a little harder but not impossible.(1) check compression. without the year model I'm giving you a average 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. clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under the engine coul. take it to the lake if no improvement. clean carbs. same test to be and fuel system service used of fuel injected engines. if no improvement in engine preformance then you will have to take it to a dealer to test with computer.
SOURCE: just bought a used boat, 1966 sportscraft with an
Hi. If you just want to run the motor then you can do it in you driveway. Go to a sports store with boating equipment and ask for "Muffs" to run your boat motor out of water. You can see a pictures of outboard motor muffs on google images:
http://www.google.com/images?hl=en&source=imghp&q=muffs+for+outboard&gbv=2&aq=f&aqi=&aql=&oq=&gs_rfai=
Take the muffs and place them over the water intakes located above the propeller (look like vents on each side). Hook a garden hose up the muffs and start water flow. Make sure nothing is near the propeller. Make sure to pump the bulb in the fuel line to the motor until it stiffens. Crank the motor. When the motor starts, you should see water start to flow out of the back of the motor near the cover and out of the center of the propeller with the exhaust. You must keep water flow to the motor using the muffs while it is running or it will burn up.
SOURCE: i have just bought a boat with an old Mercury 500
if you have no spark at your spark plugs then you have to check if your coil is getting power and if it is sending out power. find your distributor and the centre plug wire and follow itto a 6-7 inch cylinder, that will be your coil. take a test light and ground it on the engine and touch the positive side of your coil with the need tip of your test light, if it lights then you have power getting to it, in that case the coil isnt sending any power to your distributor, take your coil and get a new one and try that. Make sure you hook up the wires the same way on the new one or you might have to y another one.....goodluck....cal in nova scotia
this sounds like the high idle circuit of carberetor has debri in the needle. I would consider cleaning carb and try again. If still continues then this would make me look at fuel pump. These 2 things are where you need to start.
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