- 1). Inspect the engine for gas. Most lawn mowers and weed eaters will have gas fill lines that the fuel level is compared against.
- 2). Inspect the oil level. Pull out the dipstick of the lawn mower's crankcase and check the level of the oil against the lines. Oil and fuel are mixed together in many weed eaters. Make sure the level is correct and that the mixture is in the correct balance. Remove old fuel and oil from the lawn mower if it will not start.
- 3). Inspect the air filter if the engine doesn't sound powerful or cuts out. Remove the cover of the air filter wearing safety glasses and rubber gloves. Remove the air filter case from the back of the weed eater by turning the wing nut or removing the plastic clip. Remove the case from the lawn mower by removing the clip or unscrewing it. Replace the air filter if it is dirty.
- 4). Check that the spark plug wire is plugged in and that the spark plug is free of corrosion by removing it on both weed eaters and lawn mowers. Remove the plug using a spark plug wrench. Inspect the end for corrosion.
- 5). Check that the triggers of both the weed eater and mower are secure and do not wiggle loosely.
- 6). Adjust the idle of the carburetor on a weed eater by turning the idle screws of the machine. Turn both screws under the idle screw so that they close. Start the machine and start it up. Turn the idle screw so that it idles slowly but without shutting down. Adjust the L and H screws until all run at their lowest setting without stalling.
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