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Carburetor no idle - Motorcycles

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If it idles with choke on then you have a restriction somewhere in the fuel system . Probably need to clean out the carb jets

Posted on Apr 06, 2015


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Echo only runs wide open

Your question isn't detail enough such as.

Q: It starts up wide open with the trigger depress fully but when I release the trigger it dies.

A: The carburetor idle jet (Picture A item #27) is dirty/plugged. the carburetor needs to be taken apart and cleaned or it just needs to be turned out a bit to flow fuel or the idle screw that sets the idle speed (Picture B) on the carburetor need to be screwed in to open the flap a bit more. Your carburetor may not be like either of these two carburetors but close enough. If you need to figure out which carburetor you have to locate the idle jet look search for picture of your carburetor and that tells all such as in picture A.

Another couple things. In picture B you see the spring on the throttle shaft that closes the flap to idle. If that area is really dirty the flap could be stuck wide open. Make sure the it is free to open and close. If the chainsaw has had a lot of use the engine could be wore to the point at idle the piston isn't making enough compression for the engine to stay running even if you turn the idle speed screw (Picture B) in as far as you can.


Aug 10, 2016 | Echo Garden

1 Answer

Motor will not idle down

Your carburetor is the problem. Either have it serviced or get a new carburetor. You can service it yourself, you will need carburetor cleaner, very thin gauged wire, air compressor if you have one to blow out the ports etc..

Also you can check out you tube for videos on how to clean a 4 cycle carburetor

Nov 05, 2015 | Ryobi Gas Pressure Washer: 3100 psi 2.5...

1 Answer

Carburetor diagrams deni pd24jh

Did you adjust the idle mixture screws ? Is this a two or four barrel carburetor and what make carb. Carter , Holley, Quadrajet etc.. What make vehicle is it ? Normally the idle mixture screws should be opened 1 and a half turns to two turns . counterclockwise from fully seated . Then you can set the idle screw to what the idle should be 600 rpm to 750 in drive . Most cars have a decal somewhere under the hood telling all these things !

Aug 14, 2014 | Cars & Trucks

1 Answer

1993 Hona Shadow won't idle

If you have switched from pure gasoline to ethanol try adjusting the idle screw (black plastic knob) under the carburetors. If you turn the knob clockwise it will raise the idle. If you drive for a while and the idle is now too high , turn the knob counter-clockwise a lower the idle. A shock dose (as described on the bottle) of Chevron Techron may clean up minor carburetor deposits, but if the idle adjustment and the fuel system cleaner do not work, then you will have to take the carburetors off and clean them. Remove the bowl and the jets and shoot carburetor cleaner through the jets and the passageways through the carburetor body to clear out any blockage. This should restore a proper idle.

Apr 10, 2011 | Honda VT 1100 C Motorcycles

1 Answer

When the bike gets warm it idles at stop lights at 3,000 rpms. Usually is idk 1.5k? Is this over heating what do I do?

You may be dealing with a combination of problems. I suspect you may have air leaks possibly in the intake manifolds. This would cause lean running conditions. To compensate for low idle you would have to raise the idle speed. Some fuel system cleaner in the tank and a short drive will help get you ready for the next step. One screw generally will adjust the idle of all four /three /two carburetors at once (depending on the model). If the bike will not run unless the carburetor idle is turned way up, it is probably because the carburetors are out of sync. With the proper equipment basically a set of vacuum gauges , a wrench, and a screw driver , you should be able to adjust the carburetors so they all open at the same time. With any luck stopping the air leaks and tuning up the carburetors should fix your idle/take off dilemma.

Jan 13, 2011 | Suzuki GSX 600 F (Katana Motorcycles

1 Answer

I have a McCulloch Trim Mac SL+ which will not idle. No matter how I try and adjust the idle screw it cuts out.

Which idle screw are you adjusting, the idle jet (L) or the idle speed screw which sets the throttle stop position. Adjust the idle speed screw while watching the throttle stop position so that it is pushed away somewhat. Adjust the L jet needle CW to stop (lightly), then back out 1-1/2 turns CCW. This should allow the engine to idle after warm up. Turn the needle CW while running for better idle, yet it should allow the engine to 'follow the throttle'. If this doesn't work as described, then check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. You may need to remove the carburetor and clean it inside and out with spray carburetor cleaner. For further insight, go to: for a 12 page article on Walbro brand carburetor theory and troubleshooting. This material applies in general to other brands of carburetor as well. Hope this helps!

Sep 13, 2010 | McCulloch Garden

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I have a Honda 1981 650 custom, The idle seems very slow and it tends to shut off when sitting at lights. How do I adjust the idle up on this?

There is an idle adjustment screw that hangs down underneath the carburetor rack between the second and third carburetors. It usually has a black plastic knob about 1/2 inch across on it. Turning the knob will raise or lower the idle speed on all four carburetors at once.

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2 Answers

Toro lawnmower starts then cuts off. It appears to be leaking fu

If there is a fuel leak causing this problem it could be from the line going to the carburetor or the float bowl. If no leak is present there, could be flooding or a sticking needle in the carburetor allowing fuel to enter constantly.

May 15, 2009 | Toro Lawn Mower With Toro Power Tools

2 Answers

Is the carb adjustment screw on bottom


>>The Following is an Instruction File I made for Correcting this Problem. Any Input is Appreciated.
>>****All the Carburetor Adjustments are the Same for Lawn Mower and Trimmers.
>>There are Several Location for the Air Mixture Screws.
>>The Idle Air Mixture Screws are Usually Located at the Top of the Carburetor Bowl and the Top of the Carburetor Body.
>>If the Main Air and Idle Air Mixture Screws are Side by Side on the Side of the Carburetor, then the Idle Air is the Nearest to the Engine.
>>The Main Jet Air Mixture Screw is Located in the Bottom of the Carburetor Bowl or Beside the Idle Air Screw on the Side of the Carburetor Body.
>>The Engine Idle Screw is Usually Easy to Identify because you can See where it Makes Contact with the Carburetor Throttle Shaft Plate Stop Ear. The H and L Air Mixture Screws Go Into the Body of the Carburetor and the Tips Cannot be Seen.
>>Some of the Older Model Carburetors have the Main Jet Mixture Screw Straight in from the Top of the Carburetor Body (this is Rare anymore).
>>If you have Cleaned the Carburetor (Disassembled and Soaked Overnight in Carburetor Cleaner (I Use Gunk). Then Blow Out the Passages with Compressed Air and Install a New Kit if Required.
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air and Main Air Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns.****
>>Holding the Throttle Full Open, Start the Engine.
>>Turn the Main Air Mixture Screw Clockwise Until Proper Revs are Obtained. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs. Now Allow the Engine to Idle.
>>Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required.
>>Now Set the Idle Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle.
>>Reset the Engine Idle if Required. If This Carburetor has a Single Air Adjustment.
>>Use the Section Above that Pertains to Full Throttle RPM Air Mixture Screw and then Adjust the Screw if Required to Eliminate Any Hesitation when Rapidly Throttling from Idle to Full Throttle.**
>>2- .
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck


jbridger (John)

May 11, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

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