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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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6ya6ya
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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

  • 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

bazzz7071
  • 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.
Reply as a comment to this post to discuss further.
Cheers

Apr 15, 2016 | Boating

1 Answer

I have a 2012 mercury 6hp four stroke that will not idle without the choke on


Hi, Lee and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
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1 Answer

Where can I find the serial number on my Evinrude 20H motor?


There is a plate or sticker on the Port transom bracket or on the steering bracket ( between both transom brackets ).
On very old engines the plate is rivetted on the steering bracket at the front of the engine.
If you can't find a plate or sticker anymore, there is a aluminum 'freezeplug' with the serial number stamped. You'll find that plug in most cases at the starboard side of the engine block near the cilinder head, or on the top of the cilinder block.

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1 Answer

1999 r1 flat spot at 3000 r p m


Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for leakage in the dark.
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
18. Check for engine trouble codes
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
1999 Yamaha R1 Flatspot Biker ie Forums
http://www.r1-forum.com/forums/101-98-99-r1-mechanical-help/474929-99-r1-3000-rpm-flat-spot.html
1998 1999 Yamaha YZF R1 Service Manual R1 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Apr 03, 2013 | 1999 Yamaha YZF-R1

1 Answer

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


Hi, Ungerconstru and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
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.
Bike won Run without Choke
Won Idle Choke
http://service.tanga-moteurs.ro/data/yamaha_virago_535_700_1100.pdf
OEM parts for Yamaha
Yamaha Virago XV1100K Owner Manual

Jul 29, 2011 | Yamaha Motorcycles

1 Answer

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

Aug 25, 2010 | RTO Oar Sockets

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