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Engine runs on choke but dies without?Special tool to adjust hi /lo carb settings?

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Your main jet in carburetor is fouled and needs to be cleaned out. The choke circuit bypasses it but when you remove the choke the gas is supposed to go into engine via the main. If clogged, the engine will quit for lack of fuel.

Either clean the carb and jet or replace carb. And yes, newer carbs have basically non a adjustable jets which is ridiculous since each engine is unique and has to be properly matched to new carb. Way around this is by either buying the special tool (he-- with them) or using a dremel tool to cut into head of adjuster a slot so that you can use a regular flat blade screw driver to adjust.

Posted on Oct 27, 2015


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Weedeater will idol but won't run - it will cut off when you try to give it gas

To begin with, let's start with the basics.
  1. Are you using fresh gas? If not, you need to get some. If there is any old gas/oil mixture in the machine, remove it by pouring it into some sort of container.
  2. If want to purchase a gas/oil mixture already mixed, a store like Home Depot or Lowes has quart cans at the correct mixures. 50:1 / 40:1 etc. and it's Leaded gasoline usually 91 octane.
Weedeaters will lose their carburetor adjustment over time because of vibration or the fuel mixtures may change. The carburetor settings are crucial for the machine to run properly.
Not all carburetors are the same, but which ever one you have, you will need a special adjusting tool to do this. You can find adjusting sets locally or here.

Not To do this process, you will need to identify the 2 special

adjusting screws on the top or side of the carburetor.
The screws are highlighted as HI and LO. The HI allows fuel adjustment for the weedeater at full throttle. The LO is for the adjusting the idle.

Try these steps:
1. Adjust both screws clockwise until just seated (tight) using the correct tool (from a set similar to the one above)
2. Rotate the HI screw 1 1/2 turns counter-clockwise
3. Rotate the LO screw 1 turn counter-clockwise
4. Start the machine.
5. When it's running (spitting, coughing...) adjust the LO screw a 1/4 turn either way until you get a smooth idle.
6. Pull handle to run at full throttle. If the engine is sputtering then it's getting too much fuel....adjust the HI 1/4 turn clockwise checking to see if the engine runs smoother.
7. When you get the weedeater running smoothly, there are no further adjustments to be made. Just make sure you are using FRESH gas/oil that hasn't been sitting longer than 30 days.
Good Luck!

Once j

Jul 06, 2016 | Garden

1 Answer

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

Dirt Rider Magazine

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

Btw, I’m available to help over the phone in case u need at

Mar 10, 2016 | GAS Motorcycles

1 Answer

Back pack leaf blower wont run past half chick

Either your carb is still dirty as in has clogged jets or passages, bad diaphragm in the carb or you have the air/fuel needles way out of adjustment. Google what type of motor you have and how to set carb. Or even get a manual, that would be my advice. Also make sure you don't have to much 2 stoke oil in your fuel mix.

Nov 03, 2014 | Hand Tools

1 Answer

How do you adjust the carburetor?

Most of the newer equipment have EPA carbs that wont allow serious carb adjustment without special tools. The tools are only supposed to be sold to service shops who will make adjustments and then put limiting caps on the adjustment screws. Anyone found defeating these systems can be fined by the EPA. If you think your carb is running a bit lean just use a little bit of choke and see if the engine picks up a bit. Then you can try mixing in some fuel system cleaner into your next tank of fuel and see if that gets you back on track. It is the cheapest way to go before spending any money on shop service or new equipment.

Be safe and good luck!

Oct 03, 2014 | Homelite Garden

1 Answer

My 2007 honda shadow starts with choke on but when push choke in dies out

Your fuel mixture may just need adjusting or your carbs may need some cleaning the adjustment is a bit painful as it requires a special tool for the carbs if you take it in for a oil change ask em about adjusting the carbs for you - a good shop will have it done in a jiffy

Jun 14, 2014 | 2005 Honda VT 750 Shadow Aero

1 Answer

My husqvarna 122c starts fine with the choke on. When the choke is turned off, the motor revs very high then eventually dies. If I feather the press the throttle, it dies right away? carb issues?

This is classic fuel starvation, replace the fuel filter in the tank, check the fuel hoses from the tank to the carb for signs of leaking or slits and cracks, failing that you may need to adjust the fuel mixture, there is a special tool to adjust the mixture screws, part no. 530035560 ( try the web for sellers ) once you have the tool unscrew the H screw 1/4 turn to adjust the upper fuel supply.

Oct 24, 2011 | Garden

2 Answers

I have an old stihl 020 av chainsaw, the problem I'm having is when you start it and it's running the as soon as you go to give it gas it want to bog out and die even if you just try to give it alittle gas...

Look for your choke lever and make sure that it is operating properly. When the engine is choked, the butterfly valve in the engine is across the opening, causing the engine to take less air, and more fuel. As the engine begins to warm up, there is less need for the choke to be closed. If your choke valve is remaining closed, the engine will die when you pull the trigger.
Best regards, --W/D--

Jan 31, 2011 | Garden

1 Answer

Wont run up to speed without choke partially on. Where are the carb. adjustments? Does it requir a special tool/

Probably uses a Zama Or Walbo carb. The mixture screws are factory preset and may or may not have plastic limiters on them. There are tools for adjusting these type carbs or you can fashion one yourself. Most of the screws are of the "splined" variety.Running partially choked is a result of the carb needing adjustment and/or repair (rebuild kit). Like anything else, they require maintenace and installing diaghram or rebuild kit accomplishes can remove and clean the carb and its internals with non-flammable brake cleaner aerosol spray. Don't use high PSI compressed air on it and never soak the carb.

Aug 20, 2010 | Poulan 25CC Gas BlowerVac

1 Answer

Craftman 32 ccweedwhacker womnt run without choke being on

This is probably a fuel-related issue, not a mechanical one. With the choke on you are enriching the gas/oil fuel mixture to the engine. This indicates that the carb is probably set too "lean" which can cause poor idling, acceleration and even mechanical damage to the engine due to lack of lubrication esp. at full throttle. Running it with the choke on will have ill effects also. You may need a diaghram or carb rebuild kit. Check condition of fuel filter in the gas tank and the fuel lines themselves. Take the covers off the carb (paying attention to location of gaskets and diaghrams) and spray liberally with non-flammable brake parts cleaner. Don't blow out the passages with high PSI strength air and don't soak the carburetor in carb or parts cleaner....then let dry, re-install and try to start and run. The Low and High speed mixture screws can be adjusted on these. You can buy the special tool or make one out of steel brake line tubing or 22 gauge female disconnect wired spade terminals stuck on thje end of a screwdriver...or you can remove them completely (notijg how many turns it took to remove them) and cut notches in them for use with a regular screwdriver...I just think the carb needs some cleaning and minor adjusting and it may work....if not rebuild it or get a new carb.

Jul 10, 2010 | Craftsman Garden

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