How to adjust weedwacker carburater h/l screw

idle adjustment can be done with a screwdriver.to adjust the mixture screws you need a special tool.you can buy them on ebay

Your problem could be a simple carburater adjustment. Air fuel mixture may be off. There may be adjustment screws on the side of carburater, adjust they slightly to see if this fixes it. If not the carburater itself may be dirty and need to be taken apart and cleaned. Hope this helps.

Your carburater is running very lean. If there is no screw on the bottom of the float bowl or on the side of the carburater to to adjust it, you will need to rebuild it and open up the hi idle jet / orifice.

the carburettor will have a bronze colored screw to increase the fuel flow .adjust it keeping the engine in idle .

While Holding the Engine at Full Throttle, Adjust the High Air Mixture Screw In Until the Engine Revs Properly.

When you cover the air bos, you are in essence, enriching the air/fuel mixture that is entering the engine. The carburetor does this when it is needed and when it is functioning properly. For the bogging problem, it is evident you need a small carburetor adjustment. I suggest turning the L mixture screw (the one on the carb closest to the engine) out (counterclockwise) 1/8 to 1/4 of a turn. The heads of the L and H mixture screws are unconventional type and some improvising will have to be done to enable you to get ahold of them to adjust them. I use a small plastic (22 gauge) automotive-type wire connector with a ring terminal end on it. I tap it down onto the screw head with a small ball peen hammer until it stretches around it. I then am able to turn it. Try the suggested adjustment for your high-speed bogging problem. And to further tune and adjust the carburetor on your machine, I highly suggest you look at the following tutorial.

http://www.zamacarb.com/tipspage.html

The high speed needle valve needs adjusting and it takes a special splined tool to adjust it. I currently am trying to find where I can purchase the tool to adjust the high and low carburator screws.

In the late 70's they mandated that the adjustment screws be capped over. If they haven't been exposed, there will be two plugs covering them on the baseplate. Air adjustment screws are always somewhere on the base of all carbs with the only exception being on Holley 4bbl carbs used on performance engines (definitely not yours)

It sounds like you need to adjust the fuel mixture screw in the carb. To do this, while it is running adjust the screw in either direction until it runs properly without the choke.

it sounds like your carb is out of adjustment and you need to adjust it. Look at the carb on your weedwacker, there is an idle adjustment screw somewhere on it and using either phillips or strait screw head and then carefully turning it clockwise go 1/8 of a turn at a time until the engine idles smoothly.