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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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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 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

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  • 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

Delage guy
  • 167 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

bazzz7071
  • 342 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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I have a starting problem with my 2005 Yamaha XTL 1200 jetski it turns over but won’t start I took out the spark plugs and cleaned them they were black but still wouldn’t go


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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.
Reply as a comment to this post to discuss further.
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7. Carburetor bowl vent line clogged/blocked/pinched.
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For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
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I have a 50hp 2007 yamaha 2 stroke


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How to connect a 2 bank (4 batteries) to the 3 GUEST switches.


Sorry for the delay. I don't understand why they have the third "on/off" switch. Normally on a boat like yours, the set would be as follows :
Each pair of batteries would be jumped together to make a single large bank. We can then consider them "bank 1" and "bank 2" usually they will correspond to port and starboard.
Now you will take the positive lead from bank 1 and connect it to B1 on the port switch and then jumper it to B1 on the starboard switch.
You will do the same for bank 2 and the starboard switch.
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You can use the third switch to supply the "house" system. Take its power feed from the "common" terminal on either of the battery switches. In this way you can isolate which battery bank you use to draw power from for all of your accessories so there is no fear of you running a battery bank dead and being stranded. For example if your house feed is connected to the port battery switch and you have the port battery switch selected to bank 1 (port bank), should you run the battery dead listening to the radio you can simply start the starboard engine and then select "all" on the port switch. Now the starboard engine will be charging the port battery bank, bringing the house system back to life and allowing you to start the port engine.
In order for the system to work it is important that all of the battery and engine grounds be connected together in a central point (a common buss bar).
Dont forget that you cannot switch battery switches while the engines are running.
Good Luck!

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