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Sport & Outdoor – Others
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Try disconnecting the throttle cable, loosen carb linkages, assure that both carbs are FULL closed….tighten linkage – and cable …check for FULL open and close with the throttle….this will be your starting point, advise to get a service manual for your outboard model to correctly adjust the carbs for max performance….GL hope this helps..
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Finding the Model Number
The model number for Johnson and Evinrude outboards is usually found on an identification tag that is located on the transom mounting bracket of the engine. Hopefully, the model number is still legible when you find it!
Set idle speed adjusting screw, clockwise to increase rpm, counter-clockwise to decrease rpm. Idle rpm range should be 950 to 1050 rpms. Adjust idle mixture by turning idle mixture screw slowly clockwise until the engine runs poorly.
Run the engine for five minutes at half throttle to bring it to its operating temperature. Then, turn the idle mixture screw slowly clockwise until the engine begins to slow. Turn the screw in the opposite direction until the engine again begins to slow. Finally, turn the screw back to the midpoint.
Turn the idle screw to adjust the idle—turn the screw to the left to increase the RPM or to the right to lower it. When you have adjusted the idle—aim for 650 RPM—reconnect the idle air adjustment valve`s electrical connection. Lower the hood and turn your car off.
With the idle mixture screw removed, the tapered portion is what adjusts the volume of fuel allowed into the engine. Turning this adjustment screw clockwise (in) reduces the amount of fuel. Turning the screw counter-clockwise (out), increases the amount of fuel delivered to the engine.
If the carburetor is new or has been rebuilt, you should set it to “factory” adjustment. You can do so by adjusting the idle mixture screws to 1.5-2 turns out, and the idle speed screw to 1-1.5 turns in. Warm the Engine Up. The engine`s running temperature directly correlates with proper air and fuel mixtures.
The idle speed screw (arrow 1) is located on the primary linkage. The idle metering adjustment screws (arrow 2) are located on the primary metering block on most Holley carburetors. A typical starting location for these idle mixture screws is between 1 and 1 ½ turns out from fully seated.
Turn the idle screw to adjust the idle—turn the screw to the left to increase the RPM or to the right to lower it. When you have adjusted the idle—aim for 650 RPM—reconnect the idle air adjustment valve`s electrical connection. Lower the hood and turn your car off.
Discover Relevant Questions and Answers for Your Specific Issue
the most relevant questions and answers related to your specific issue
I have a 99 yamaha f100 four stroke outboard. Problem I have is boat will acclereate fine get up on plane and after running for about a mob at wot will decell and only run around 4500 rpm. Then after coming back to idle will have a slight miss then run smooth and repeat every run. Changed the plugs and fuel filters alll oe yamaha has fresh oil timing belt is good any ideas will help or fuel psi spec. I am an ase master automotive tech so I know alot about engs. To me it feels like it’s running out of gas. Like the carb bows are full when I take off but then runs out after running wot. Any info will help
ANSWER : I have exactly the same problem with my Yamaha F100, have you got any solutions yet?
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I have a 2001 Yamaha XL700Z Waverunner. The compression on both cylinders is about 120, it starts and runs fine – dry. Won’t quite idle, but I can start it and rev it up fine (for a short period, of course). However, as soon as it gets in the water, it will barely run – it will start and sputter and you cannot get it to run more than a few seconds or rev up. Take it back out, let it dry, starts & revs fine. It is not getting any water in the casing that I can tell, its almost as if water is getting something wet through the cooling system that I cannot see?
ANSWER : Try cleaning the carbs and the fuel lines, filter
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Motor was running great, but it died slowly and never start again
ANSWER : Check to see if you have a spark -then check if you are still getting fuel-and how old is the fuel-because it is recommended ,an im assuming its a 2 stroke motor,that the fuel should be replace with a fresh 2 stroke mixture every couple of months as the mixture jellyfies and sludges up the carb etc-try those first
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I own an 1992 Yamaha Phazer II PZ 480. I have done a bunch of work trying to get this hunk o stuff going. I have good spark and compression from the motor. I rebuilt both carbs and both clutches it starts and runs fine but when I try to move it just boggs down- no power? Where should l look next to get this thing moving again? I work at a Marina that used to service sno-mobiles so I have the tools to get it done. Could you maybe send me an assembly diagram of where to look and what to do next? Thanks
ANSWER : For an assembly diagram, contact Yamaha directly.
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I have a 1996 yamaha wave venture 1100….ran greatsat for 2 yrs..started but only ran for spray into carbs….drained fuel started and ran good. Started about month later and would only run as long as primed with starter fluids…checked fuel filter(ok)…fuel flow to fuel pump ok…output of fuel pump appears ok….but engine will only run as long as starter fluid/gas is sprayed into carbs. I don’t think it’s the carbs as it ran great a month ago…now it’s starving for gas flow….so it appears to be a fuel delivery problem…what would be the sequence of tests up to tearing into the carbs? is there a fuel filter inside the carbs? remember it fires off great when primed…until the fuel spray is consumed…
ANSWER : Check the on/off/reserve valve
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1985 40 hp Johnson outboard wouldnt open up and
ANSWER : Sounds like your mix is off and it’s fowling the plugs. probably too rich. make sure the level in your carb bowls isn’t too high. Really sounds like you should clean and bench set your carbs. Especially if a plug change helps but doesn’t last, then it’s got to be your fuel mix, or maybe timing.
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My 50cc mini bike starts then dies 5 secs after starting. why?
ANSWER : It sounds like you may have 2 problems
Bad gas
dpossible loose spark plug( bad compression) Solutiondump out the gas put new inRemove the spar plug and examine the plug if it is wet and black it is fouledif it is white ad dry it is not getting gasIf you can replace the spark plug if not just clean it with a wire brush put back in and tighten Finally make sure the spark plug wire is not loseBest of luck to you
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