Question about Yamaha TT-R 125 Motorcycles

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Can't get the bike to idle without the choke on

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Count the number of turns it takes to lightly seat the idle mixture screw, write down the result. now remove the idle mixture screw and spring. shoot spray carb cleaner into the hole for the mixture screw using the straw that came with the can. The idea is to clear any blockage in the idle circuit (without having to take apart the carb). Return spring and idle screw and tighten down lightly. count back the number of turns you wrote down. There could be other problems but this is a great starting point assuming the idle speed adjustment wasn't messed with.

Posted on Nov 06, 2010

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Idles with 1/2 choke. If open choke, or throttle - engine dies without any RPM spike. Carb was cleaned, jet is clean. When idles, there is gas in the primer bulb.


Hi, Andrew 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 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.

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.

Bike won Run without Choke

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Bike starts up idles on choke dies with choke off our when warm XS650 Forum

What could be wrong if bike will only run on choke

Mar 10, 2016 | GAS Motorcycles

1 Answer

2007 Honda shadow spirit 1100. Has set up for 6 months and will fire but will not idle without choke on full.


Failure to idle (or even start/ run) without the choke is indicative of dirty carb(s), partially clogged slow jet. Leaving a bike to sit with un-stabilized fuel is inviting problems, ethanol is the culprit.

Nov 23, 2014 | Honda Motorcycles

1 Answer

When choke is off wont idle


Hi, Anonymous 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 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.
YZ426 won idle without choke Intake Jetting Fuel Injection
YZ426F Won Run Choke 4Strokes com
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

Jan 15, 2013 | 2001 Yamaha YZ 426 F

1 Answer

Bike will not idle without the choke ingaged?


The idle adjustment is on a small knob under the left side of the fuel tank. Start the bike as you would normally, then turn the knob until the idle speed picks up and slowly work the choke in. Continue making these small adjustments until the choke is all the way in and the bike is idling at a speed that is to your satisfaction. Barring any mechanical problem, this should do the trick.

God bless and good luck.

May 02, 2011 | 2001 Suzuki VL 800 Volusia

1 Answer

I have a 2005 harley davidson sportster xl 1200 custom. after bike is at normal operating temp.when i stop for redlight or stop sign, bike idles to fast.i can let out on clutch little bit and it will slow...


If the carb is adjusted correctly, the engine will not idle without the choke when cold. I will usually take at least 3 to 5 miles of riding to get the engine warm enough to idle by itself without the choke. If your bike is a full operating temperature, it should idle at about 1000 RPM. If it's idling higher than this, you need to slow it down a bit.

Remove the air filter cover and look at the top right side of the carb. You'll see a screw there . This is the throttle stop screw. Turn the screw counterclockwise to lower the idle speed to 1000 RPM or so. Blip the throttle and let it settle back to idle. Reset it if necessary. Once set, put the air cleaner cover hand on.

Mar 14, 2011 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

Kawasaki Ninja 250 running problem


This could be due to timing screw being incorrectly set
Locate gold timing screw on the carbrettta turn it clockwise only slightly till bike idles without choke on, Then when choke it on it should idle a touch higher.

Jun 21, 2010 | 2008 kawasaki Ninja 250R

1 Answer

2005 tt r 125 wont idle without choke, fuel


floats out of adjustment remove the bowl check float reset if adjustable or replace

May 09, 2010 | Yamaha TT-R 125 Motorcycles

1 Answer

Won't idle without choke, turn throttle boggs out


have u checked the float hight on the carburator? also make sure ur choke curcuit i clean and free of dirt

Apr 13, 2010 | 2005 kawasaki KLX 125

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