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Jet ski will not run at full throttle

Jet ski runs at about half speeds for a few min. theN shuts off. I have changed plugs, checked fuel filters and gas lines. It acts likle it is not getting fuel. any Idea what the problem is?

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Jet skis have a problem with the fuel pickup tube in the tank getting plugged up,also check to see if your exhaust is getting to hot,you should be able to keep your hand on it without getting burned if your water jackets are not plugged

Posted on Nov 14, 2009

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Check for holes in the diaphram the pulses the needle and seat in the carb.

Posted on Jul 23, 2009

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1 Answer

Jet ski is "hard stopping"


Any motor that runs and then develops sudden stopping symptoms gives me suspicions of fuel delivery problems.
I'm not familiar with your machine, but I would be looking at the fuel filter as probably plugged up.
Wild guess, but sometimes I luck out.
Cheerfuls.

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it sounds like your fuel filter is ready fr a change and that your main jet might be blocked or needle and seat might need checking cheers

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Half speed at full throttle


what kind of jet ski we talking about year make model

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Xr400r's been stood a while, had trouble starting it, changed the plug, now starts easier but bogs on use of the throttle and only runs with the choke on half, changed the fuel cleaned the main jet but...


Make sure the carb is thoroughly cleaned, all jets not just main. The half choke is compensating for the slow circuit jet. Check your air/fuel mixture. Also, check the air and fuel filter. If all checks out fine and you still encounter the problem, could be : bad gas, wrong spark plug heat range, or most likely the diaphragm for the top of the carb.

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I have a Briggs and STatton 24 OHV intek motor on a craftsman lawn tractor. I got it on sale and when I got home it ran rough. The fuel line had collapsed or was plugged with some white powder. I took off...


It sounds like the fuel mixture is running very Lean..There are usually two adjusting screw screws on the carburettor that control the mixture. A Larger one is for the Main Jet and a smaller one for the Idle Jet. There is also an adjusting screw on the throttle butterfly to control the idle speed.
To adjust setup, start with at least a half tank of fuel, and have engine at operating tempurature (That is warm but not overly Hot). As a starting point, loosen (anticlockwise) Main Jet screw about half a turn, to richen mixture,so that engine will run without choke. Run engine at full speed and adjust main jet for highest smooth speed without engine missing due to mixture being too lean or rich.
Allow engine to idle and the adjust Idle Jet Screw for smoothest idle. Idle Speed screw may have to be adjusted if idle speed is too high/low.
Sequence above may have to be repeated to get best running. If engine hesitates sometime when sudden load is applied but then picks up, try adjusting Main Jet by 1/8 to 1/4 turn richer until it handles the load without faltering.

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Carburetor settings for mac 10-10


Check the fuel filter, air filter and muffler for plugging. Check the condition of the fuel lines. Make sure the carburetor fasteners are tight. Turn both jet screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting which should allow the engine to start and run. Do so, and allow the engine to warm up. Pull the throttle full on and adjust H jet CW until the engine speeds up somewhat, but still 4-stroking. Correct adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and allow to idle--adjust L jet CW so that the engine runs fairly well, yet allows the engine to 'follow the throttle'. Set idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

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2 Answers

Dies at full throttle.


Hi,
Has it been standing for a while?
Few things to check.
1: Fuel filter in tank. Use a piece of bent wire to hook the filter through the filler hole and pull it out and swap it.They get gummed up with oil if they have been standing.
2: Fuel hose. Even the tiniest pinhole in the fuel line will cause exactly the problem you have.
3: Many chainsaws have another hose that goes from the crankcase to the carby, this is the "pulse line" and is just as critical as the fuel line.
4: Although one tuning jet is marked "H" for high speed, & one is marked "L" for low, at full revs they both deliver fuel, see if you can richen ( turn anti-clockwise ) the "L" jet a bit more and try that.

Please let me know and give me some more info, I have all confidence we can nail it.

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My Polaris freedom(jet ski) starts and runs good


Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer. I know all these are expensive but if your going to be a polaris tech you will always need them. Troubleshooting (1) check compression. Look at your Clymer manual for specific psi.all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine
times out of ten.Ethanol gas is proven to stay stable in fuel systems for only 30 days in 90 + degree heat. Drain gas tank,clean fuel lines replace and replace all fuel filters. Polaris has a gravity filter under seat, clean it. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a C.D.ignition. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive polaris, if the problem is still there then there is further steps to take. If your polaris is fuel injected. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your polaris. Troubleshooting tips and teaches you how your polaris works. If its carburetor then you should clean carburetors. Inside the carbs is another filter that needs to be cleaned. Its not difficult you just make sure you put everything back in proper order. take pictures if you need to.

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