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An engine will stall when you give it gas if it does not have the correct mixture of fuel and air. This is controlled by the carburetor or throttle body and may need adjustment.
The fuel mixture is probably set to rich. Also, the wrong spark plug (with regard to heat range) could be in the engine. If you have an adjustable carburetor with mixture adjustment screws, try turning the screw (probably located on the bottom of the carburetor, in the middle of the bowl) inward 1/8 to 1/4 of a turn. This will lean the mixture. If you have a no-adjust carburetor, then there is not a lot you can do to change the mixture. Try using/replacing the spark plug with the correct spark plug as recommended by B&S. Good luck!
The Correct mixture would be 14:7 to 1 (one) By using an Exhaust gas Analizer is how this would be deternined.
The carb on a McCullouch chainsaw can be adjusted by turning the idle mixture screws. This controls how much fuel and air are mixed inside the carburetor.
take the tubing off of the carburetor that is attached to the gastank and let tank drain, reattach disconnected hose/s to the carburetor, fill tank with proper mixture and start!
fine screw, fine hex screw, fine adjustment, micrometer.Some screw to adjust something. Either tension, air flow, fuel flow, etc. Examples are the adjustment screws on a carburetor that adjust the fuel/air mixture and the idle speed.
The idle speed of the carburetor on a featherlite fl20 weedeater can be adjusted by turning the small screw that is located right next to the choke setting switch. For the best adjustment, the featherlite should be on and running. If the weedeater is running rough, the mixture can be adjusted with the low and high (labeled L and H) mixture tamper proof screws.
Carburater adjustment only affects idle mixture. If you need to adjust the mixture when it's under power, you'll need to use an exhaust gas analyzer and change the jets and/or metering rods.
Most common problem is a dirty/clogged fuel filter restricting a good flow of fuel to the engine. Otherwise, the carburetor needs adjustment. Or, if the engine is blowing black smoke before it dies, check the spark plug and the air filter, or a too rich mixture from the carburetor.
Most 305 engines came with all the adjustments sealed. You will need to remove the carb and find the three adjustment cover plugs and remove them. They are: left and right idle mixture and throttle close stop.
Turn all the way in then about 1/4 turn out. This should get you close may have to twik alittle.
enrich the fuel/air mixture.