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I need ignition switch diagram for 1997 Mercury 200HP EFI Nitro series Boat.

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Posted on May 30, 2010


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I have to pat throttle to get the boat to go but not everytime it seems like its starving for gas. 2000 mercury 200hp

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I would say its the coil from the "heat sink" that it goes through after shutdown. The mechanics probably can not duplicate your "ON WATER" conditions in a shop. They probably take off the hood cover for access, run it in a tank without the load of the boat, or just use the "Muffs" with no resistance on the prop or engine at all.

You may also be fuel starved. The checkvalves in the fuellines may be allowing the fuel to siphon back to the tank. The engine takes off good until the float chambers run dry, then you are trying to pull the fuel up and there is a lag. When you are "Working with the throttle" you are regulating the throttle opening to match available fuel. Also check the fuel screens if a Tech has not done so. Would be interested to know outcome.

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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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sound like a throtle positioning sensor but you need to change your spark plugs first always if you havent already

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