Question about 1986 Yamaha FZ 750 FM (Japan)

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Wont idle I have a Yamaha 50 ATV and it will not idle without the choke on full. Warm or cold it does not matter as soon as I switch off the choke the engine throttles down and dies. I pulled the carb and cleaned the jets but that did nothing. Please help; my 6-year-old son thinks I can fix anything.

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Lol buddy if its not idling turn the idle screw in until it idles get back to me if no difference wont idle - 2ee8c57.jpg

Posted on Sep 30, 2009

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Posted on Jan 02, 2017

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Engine wont run after warm up and no choke


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
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4. Float needle and seat sticking.
5. Float level too low.
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8. Air/fuel mixture screw set too lean.
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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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Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
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4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw 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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Hi Joe, I had asked for a little clarification and have not received any information. I will answer this question based on the generator is in good working order and it is a recoil start. Open the petcock, (this is the fuel valve) and give it about a minute to fill the fuel bowl on the carburetor. If your generator has an engine an on/off kill switch, set to on. If the generator has an auto idle switch set it to off. If the engine has a throttle lever located under the carburetor, push it all the way down (full throttle). Pull the choke knob out completely, there is a detent on the choke for half choke, pull it past this for full choke. pull the recoil starter rapidly. As soon as the engine starts running push the choke knob to half choke, this will allow the engine to run smooth while it's warming up. Depending on the climate that you are in, warm up time will vary. After a minute or two in cold climates start pushing the choke knob in, if it starts to run poorly pull it back out too the half position and let it warm up some more. When you can posh the choke in without the engine faltering it is ready to go. In warmer climates you might be able to start the engine without the choke or in the halfway position. Robin Subaru makes some of the finest small engines available. I would choose a Robin over a Honda every time. I hope this gets your generator going, and once again this is based on the generator being in good working order. Good luck, Michael Burke.

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Motorcycle starts on full choke but will not run even given more fuel even if the choke is turned off after warm up


Hi, Edward and the usual suspects are:
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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 screw set too low.
8. Air/fuel mixture screw 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

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Hi, Kjturner and the usual suspects are:
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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.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
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I have a kawasaki lakota 300 (2001) It starts and runs with the choke on soon as i turn choke off it dies idle adjustment screww does nothing. I can here that it is working. Ive ran it up and down the...


You need to take off your carburetor , disassemble it, and clean the jets (specifically the slow jet) and the passageways in the carburetor body that feed the gas to the carburetor throat. Carefully set your air screw setting back to stock setting. and reassemble. Inspect the intake manifold and air box tubes for cracks and separations. That should get you idling again.

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The choke should only be used when starting cold. After the bike is warmed up you can turn the choke off. If it keeps shutting off after being warmed up for a few minutes, then check your gas/air ratio for the idle air mixture knob. Loosen it up 1/4 turn to allow more gas to flow.

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