Question about Yamaha YZ 250 Motorcycles

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2001 yz250 idles really high even though idle screw is all the way out!!

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CHeck your throttle cable for brakes your cable may be pinched or your slide in the carb may be stuck up. Take the cable assy off the top of the carb and make sure your slide is seated all the way down, and clean...

Posted on Sep 10, 2009

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Motor only runs on high idle how do I fix it


Check your govenor linkage and action. Your engine has a plastic gear running the govenor inside the crankcase.

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How to adjust the carbuetor on a 2001 yamaha 250?


The idle air screw is on the side of carb. the high speed requires a special 90 degree screwdriver. This allows access to the high speed jet which is on the bottom of carb...Adjust idle screw till smooth idle is obtained. Adjust high speed while running to obtain the highest RPM.

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Revs up and down at idle , overheats and bogs down at low revs


Hi, Anonymous and the usual suspects are:
1. Extremely lean fuel mixture.
2. Dirt, rust, water, or ethanol sludge in the fuel system.
3. Sticky throttle cables.
4. Multiple carburetors not in synchronization.
5. TPS sensor out of adjustment or faulty.
6. Wrong spark plugs for the type of service.
7. Throttle bodies not in synchronization (FI)
8. Faulty O2 sensor.
9. Clogged, stuck, or faulty IAC valve.
10. Aftermarket components not compatible with ECM.
For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have a nice day.
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Aug 09, 2012 | Yamaha YZ 250 Motorcycles

1 Answer

Yamaha yzf 250 high idle and over heating


Hi, Anonymous and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
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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Mar 12, 2012 | Yamaha YZ 250 F Motorcycles

1 Answer

My 1989 yz250 has poor power when reved up even though i cleaned the carb. Also black oil ozzing from exhaust port at the cylinder. what the problem. It can idle


Could be a number of things...
Black ooze is due to being too rich. You need smaller jetting. (Pilot and main) You can read the spark plug for jetting, as you want it to burn chocolate brown.
Also, a carbon plugged exhaust power valve can cause poor high rpm performance.
A compression test will tell the condition of your rings.

Dec 09, 2010 | 2003 Yamaha YZ 250

1 Answer

2000 Yamaha YZ 80 poor idling


Hi, Shaundavies6 and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
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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Saturn 2001 SL code showing high idle misfire cyl,1 egr valve


i had that problem, you need to get your head gasket replace.

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Mitsubishi libero idling funny!!??


Do you have a check engine light on?

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