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It starts first try but I can't idle it down. It runs wide open!

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From your information we have no idea what it is.
If it is an engine, the throttle return spring is probably not connected. This may be on a governor. A little info and we'll have you idle in no time.

Posted on Apr 22, 2015

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Posted on Jan 02, 2017

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1 Answer

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.
26256623-1ts0so3wcqkptntjrthxjlss-1-0.jpg

26256623-1ts0so3wcqkptntjrthxjlss-1-2.jpg

Aug 10, 2016 | Echo Garden

1 Answer

Motor starts good idiols high and stays there


rebuild carb with factory kit..,it sounds like its flooding. Or throttle is stuck wide open..,maybe a bad return spring is broke.

Dec 13, 2014 | Garden

1 Answer

I have a Tomos a35 Sprint and I put a 70cc cylinder jug on it, a techno circuit pipe and I have a new carb. I up jetted it to a #58 and it starts only when the choke is down, once I take the choke off it...


You need to adjust the idle 1st.Main jet #58 is just for wide open throttle. Start by turning air screw all the way in "gently" till it stops, and back it out 1 and a half turns. Back out idle screw until slide is closed " not touching slide" . Turn until just contacts slide plus 1 full turn in opening slide. Start it up with the choke on and turn the air screw slowly in or out and slowly move the choke off till you can get it to run with the choke off. Than adjust idle screw " the one that moves the slide up and down to set the RPM. If you cant get her to idle with the choke off and the carb is air tight on the intake manifold. Carb might be to big. If you can get her to idle but it runs ruff I will try to help you tune the carb further. Good luck.

Apr 24, 2014 | 2005 Tomos Sprint

1 Answer

Diagram distributor


Wide open as in wide open throttle?? You mean the engine is racing? Something is wrong with the throttle controls, or the throttle valve in the carburetor may be sticking open. Look down the carb throat. At its base will be the throttle valves-"butterfly" valves just like the choke valve on top of carb. The throttle valve should be closed at rest, or at idle, or when gas pedal is not moved. Rotate the throttle lever on the carburetor by hand (when gas pedal is pressed down, the throttle is rotated). The throttle valve at the bottom of the carb should open and close with the throttle lever.
If the valve is sticking, spray some carburetor cleaner down it, and spray the outside clean, too. Work the throttle back and forth to make sure it is free to move.
For a high idle, have the carburetor adjusted. Timing should be checked, too-that can cause a high idle, but wouldn't cause it to go wide open.
Let us know what you find. Good luck.

Dec 07, 2013 | Ford Ranger Cars & Trucks

1 Answer

Honda gx160


Kescorpio56:
Check your throttle and choke settings. Something is causing the throttle plate in the carburetor to remain open or the governor is improperly set. I would reset the air/fuel mixture screws to one and a quarter turns out and back the idle screw all the way out. Make sure that the throttle cable operates the throttle properly and check the governor setting and reset the governor setting if needed. Start the engine and adjust from there. When the engine starts, adjust the idle screw until the engine idles. Adjust the fuel/air mixture screws for the best idle. Then run the RPM up and adjust the fuel/air mixture screws for the best run/idle combination. Don't forget to adjust the governor if the engine runs too fast or too slowly.

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1 Answer

I have a poulan 4218 it starts but has to be wide open to run there is no mid range or idle just wide open.


The carb might need adjusting the adjustment screws my be turned in to far witch is causing it to run wide open and not having slow idle or mid idle

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1 Answer

20 hp intec runs wide open


24 hp briggs. replaced cam, exhaust lobe was unhardened. now it doesnt fire on that cylinder. plug is wet. spark tester shows spark,please help.

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2 Answers

Idle runs too high when I come to a stop, for about 5 seconds.


The throttle body may need to be cleaned. Take off the induction hose to the throttle and open the plate. Make sure the vehicle is not running. With the throttle plate wide open, soak a cloth rag with carb and choke cleaner and work the rag around the inside of the body especially where the plate's closed position is. remove the rag and spray a small amount of carb cleaner down the throat of the throttle body. replace hose and run vehicle at 1500 rpm's for a few seconds. This should fix the idle. It should be idling at about 800 rpms.

Apr 24, 2009 | 1999 Saturn SL

2 Answers

Idles to fast


When I crank my truck it runs wide open for a minute of so and then it starts to idle down. What causes this? It is a 1992 Chevy S10 v6 pickup. How can I fix this problem? I have no manuel on this vehicle for a diagram of the engine at all.

Thank you. Dave

Oct 16, 2008 | 1992 Chevrolet S-10

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