How to Adjust the Poulan 25CC Weed Eater

Unscrew the air filter's box cover with the screwdriver. Take the cover off and slide the foam element out. Brush the area around the box, cover and carburetor. Wash the foam part in warm, soapy water. Rinse under cool water and air dry completely.

Unscrew the fuel tank cap. Tilt the engine on its side and drain all remaining fuel from the tank into a fuel container. Mix a fresh batch of trimmer fuel using a 40-to-1 gas-to-oil ratio in another fuel container. Fill the tank with the new mixture.

Set the power head of the Weed Eater on a flat, outdoor area. Position the head so it won't contact anything during adjustment. Locate the carburetor adjusting screws, which on most Weed Eaters sits on the left and right sides of the carburetor, in between the power head and the filter box.

Start the Poulan Weed Eater and let it warm up for 10 minutes. Tighten the idle speed screw clockwise until the engine speeds up and the head starts moving. Back the screw out counterclockwise until the head stops. Move the screw in slowly again, searching for the highest rpm before the head starts spinning.

Tighten the low speed screw in clockwise until the engine speeds up again. Move the screw back out until the engine slows down again. Fine-tune the low speed to set it at the cleanest, smoothest operating conditions. Fire the trigger and check the acceleration.