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

May be plugged carb but often this is high speed and low speed carb adjustment. Requires special tool to fit adjustment screw...i always take the carb off and use dremel to cut these two air mixture screws....cut a slot on the top turning them into a slotted screw, then open each one counterclockwise 1/4 turn when carb is reinstalled. Run it and make adjustments two low and high speed screws till it idles nice and throttles up smooth and quick.

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. https://www.amazon.com/HIPA-Carburetor-Adjustment-Including-21-Teeth/dp/B01FAAKN7E/ref=sr_1_3?ie=UTF8&qid=1467833656&sr=8-3&keywords=carburetor+adjusting+tool

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

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.

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!

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

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.

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--

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 this...you 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.

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.

Sounds like the carb needs cleaning, it is staying on choke to long. I would not bother the screws, or either a hose for the gas flow is bad.