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15 horse mercury outboard

1990 model motor falls flat and dies on acceration from idle speed without using choke. Motor runs fine at all speeds, but acceration from idle or slow speed is the problem

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Clogged jets in the carb...clean out carb or rebuild carb.

Posted on Aug 06, 2009

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Starting proceedure for 72 evinrude outboard?


  • Check all connections , fuel, battery, etc
  • Squeeze primer bulb until firm
  • Lift choke switch , listen for operation (click)
  • Raise idle speed lever, not too much, be prepared to lower quickly if engine starts to over rev . (remember, this is a 1972, it does not have much for safeties.)
  • lift and HOLD choke switch
  • Turn key to crank
  • release choke when fires
  • if running, you may have to flip choke switch again until it warms up.
  • watch idle speed as 2 cycles can "run away"
  • Hope this helps
  • All of this assumes the motor is in the down position and IN THE WATER or hooked up to a flush device.
  • NEVER start the motor without water going to the gear case(water pump)

Feb 16, 2015 | Boating

1 Answer

Why my 2006 tohatsu 5 h.p outboard will not idle down to trolling speed without spitting sputtering then dieing.


Remove the carburetor and thoroughly clean all of passages by compressed air you probably have blocked passage for fuel on the low idle side

Nov 09, 2014 | Seloc Mercury Outboard Engine Repair...

2 Answers

I have a 1990 90 HP mercury outboard. It is rough idling and surg


I have a 90 hp force ob. when i run it with the ears she runs fine lets me bring the throttle all the way up. when i but it in the water thru the wake area i can do 4 mph once i'am out of the wake area and give it the gas she dies, any ideas

Apr 20, 2010 | Raymarine Linear Feedback Unit For...

1 Answer

3.5 mercury outboard stalls when put into forward


hi take the prop off see if there is anything /string/ between the hub and the housing check oil lvel in g/box /is gear box nice and free if all is ok try it in ware with just a small amount of choke
drain /empty fuel out replace with fresh /correct oil mix
check /change fuel filter/air filter
warm engine up check idle mixture ajustment/tick over speed
increase idle speed slightly/7/800 rpm
hope this helps merlin v 12

Aug 20, 2009 | Light Outboard Motor Boat Bass Fishing...

3 Answers

My mercury 35 hp outboard motor idle's fine but won't run


While at the river try to adjust the fuel air mixture. When you are on the water it puts the engine under a load and if that dont work then dont be afraid to bump up the idle stop screw slightly.

Aug 02, 2009 | Light Outboard Motor Boat Bass Fishing...

1 Answer

15hp push idle in motor shuts off


First, always have the motor in water or with a hose and muffs when you run it. It is simple to fix if all the parts are there. Let me put it this way. If you know where the air mixture adjustment is on the carburetor you turn this screw until the engine speeds up at idle to a maximum rpm, then back in 1/4 turn. Adjust throttle stop screws to achieve a minimum base idle. If this seems complicated, take it to an outboard place or lawnmower shop(if you have a hose and muffs). Its a 15 minute job and will last until its changed.

Jun 13, 2009 | Boating

1 Answer

No acceleration


I'd be checking fuel flow. Usually if you have to choke or squeeze a primer bulb to keep it going, the motor isn't getting enough fuel. Check all fuel lines and connections are air tight, then if problem persists, investigate fuel pump.

A good carburettor cleanout and new carb overhaul kit wont hurt either.

Feb 28, 2009 | Light Outboard Motor Boat Bass Fishing...

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