Poor trimmer performance is not the only consequence of operating your Weed Eater with the choke on. Partial ignition of the fuel creates thick smoke inside the combustion chamber, and the smoke leaves carbon deposits on the spark plug, which can cause it to misfire.
It also blackens the air filter, which further restricts air intake, and it clogs the spark arrestor, which is a screen placed between the exhaust port and the muffler. These deposits quickly make it impossible to start the trimmer's engine until they are removed, and the affected parts may have to be replaced.
The proper way to start your Weed Eater trimmer's engine, according to the Weed Eater website, is to set the choke to the on position and pull the starter rope no more than six times.
If the engine doesn't start, set the choke to the halfway position, between on and off, and pull the starter rope three more times. When the engine started, let it run for 10 seconds, and then turn the choke to the off, or "Run," position. If you can't start the engine after pulling the starter rope three times with the choke in the halfway position, then wait 10 minutes, and repeat the starting sequence. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities.
An easy way to check if your air hole is clogged is to simply loosen the cap while the trimmer is running — If performance improves, a replacement gas cap is your fix.
Fuel filters are typically located inside the gas tank of a hedge trimmer — These are small, cylindrical filters attached to one or more hoses leading from the gas tank to the main body of the trimmer. Over time these will fill up with gunk and residue — More so if you have left your weed trimmer sitting up with fuel left inside.
If using a two-stroke engine that requires you to mix your own fuel double-check the recommended ratio and make sure your mix is right. The choke supplies fuel to the engine to help it crank up from a cold start; if your choke is on the wrong setting this can lead to stalls.
While starting to crank move the choke down to the half-choke point and then make sure it is completely disengaged once the engine is fully started. Sputtering and stalls can also be caused by an ill-adjusted carburetor. Note this position as well. Side note: If you have a hard time keeping the engine running while working on the carburetor settings it might be a good idea to recruit a friend to help you out — One of you can keep the trimmer active while the other checks the carburetor adjustments.
To remove your carburetor first find and remove your drain float — This should be attached with a series of either two or four screws. Then remove the carburetor from your trimmer and spray thoroughly with carburetor cleaner, making sure to get in every divot, crack and crevice.
Let this dry thoroughly before reattaching to your trimmer and then reattaching your float note: be careful with your float, as an improper installation can lead to gas leaks. If the gas grime has got you down, why not go electric? While some of this pressure is needed to allow fuel to flow to the carburetor, with too much pressure the gas will not be able to flow. A small check valve on the gas cap regulates this pressure, and the extra heat needs to escape out this small hole.
You should clean or replace your gas cap if this hole is blocked. The fuel in the tank must first pass through the fuel filter, which sits inside the tank and is connected to the fuel line.
This filter may be clogged on one side, and the fuel may have more difficulty passing through when the engine is tilted in that direction.
Replace your fuel filter. Stalling can be caused by debris inside the tank that is clogging the fuel filter when the engine is tipped. Wood chips, grass clippings and dirt can float around in the tank, so you should clean out your gas tank with a little soapy water and a brush if it's dirty. There may also be a deeper issue in the carburetor.
A dirty inlet valve, plugged filters or screens can block a portion of the gas from getting to the carburetor. While a new carburetor can be expensive, installing a carburetor kit may help extend the life of the carburetor.
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