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Yamaha XR1800 jet boat the starboard engine won't run over 3000rp

Hi! on XR1800 jet boat the starboard engine doesn't run over 3000 rpm and the spark plug in the middle cilinder remains clean (not working?) All three have compression. On each cilinder sparkplugs show fire. Starts and holds idle ok. I've changed wire but it didn't help. When attempting to add throtlle higher smoke occurs from exaust. The water seems to cool the engine ok. thank you!

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Posted on Jan 02, 2017

  • 157 Answers

SOURCE: Evinrude 25 pk 2 stroke 2cyl outbord boatmotor

Hello enjoy42. From the information you have provided I would lean to the weak cylinder coil. Unplug the good spark plug wire & test run the engine on the weak cylinder. You could go to swapping the coils on the cylinders. Check your wiring terminals on the coils. Check with a marine dealer for the correct plug. I owned a 35 Evinrude on a Bass boat & it would out run my buddys 40 Mercury. Good Fishing.

Posted on Oct 03, 2008

  • 43 Answers

SOURCE: 1993 Ford Explorer idles rough when engine is warm

try changing distributor cap & coil

Posted on Jan 06, 2009

  • 1 Answer

SOURCE: Evinrude 55 boat motor model # 55672E

it could be a little intake manifold leakage...check it!!

Posted on Sep 08, 2009

  • 156 Answers

SOURCE: 1998 camry 5sfe engine, surging at idle

Check for air leaks in the vacuum pipes in and around the inlet manifold, they have a habit if going brittle and splitting.
Another possibility is the temp sender , if the ecu thinks the engine is too cold it will compensate causing the engine to " hunt". This can be something as simple as a worn radiator cap seal letting air into the cooling system and tricking the sensor.
Hope this helps, Marshall

Posted on Apr 29, 2010

  • 338 Answers

SOURCE: 2001 yamaha ttr 250, starts, idles ok, bogs at acceleration

Has the bike been stored for any long length of time?
old fuel in the carburetor will turn to a varnish like residue blocking the jets,or possibly water in the carburetor.

Posted on May 03, 2010

Testimonial: "The bike was not stored and was ridden regularly, but it still sounds like it could be the carburetor. Thanks for your insight."

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At least once every trip the starboard engine goes into a wild rpm fluctuation and has to be shut down several times to get back to normal

Hi David:
Starboard? Sounds more like a boat than a car or truck.
What kind of engines are we playing with.
Fuel supply will probably be the problem so make sure all filters are clean and that there is no water present (in the fuel - outside under the boat is OK)
If this is a diesel engine, the fuel will be shut off with a solenoid. If something is shorting the ignition switch off position, the engine will think it is supposed to shut down, consequently, engine will die, then rev, then die, etc.
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Hi, Anonymous and the usual suspects are:
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I just got a 1997 yamaha virago 1100. It will not idle unless I leave the choke on and the engine revs at 3000 rpm. Runs perfect after 3000 rpm. Any ideas? Original factory carb settings? Thanks

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Throttles up to 3000 rpm out of gear. Stalls or bogs down at 1500rpm or above when in gear. Hard to start. Main jets on Carburetors?

That's where I would look first the Main jets on Carburetors.
However also have you changed the plugs, I have had even new ones give me this type of fault, If so clean the old ones and retry.
I could be that simple.
Have you done a compression test to make sure all cylinders are within 10lbs of each other, If they are not then your troubles are about to really start.
Not often but coil pack have been known to give up under load.
WITH PLASTIC pliers while you run the motor up with load pull one plug lead off at a time to see if a spark jumps or motor changers note, if change happens then that plug is firing. Be careful tho, as this can give you a shocking experience. Good Luck

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