Quck answer
If your grass trimmer only runs in choke, it may indicate a problem with the fuel system or carburetor. Here are some steps to repair it:
1. Check the fuel filter and replace it if clogged.
2. Clean the carburetor by removing and disassembling it.
3. Inspect the carburetor for any clogs or debris and clean it with carburetor cleaner.
4. Adjust the idle speed and mixture screws on the carburetor.
5. Replace any damaged or worn-out parts, such as the carburetor diaphragm or gaskets.
6. Reassemble the carburetor and reinstall it in the trimmer.
7. Test the trimmer to see if it runs properly without needing the choke.
A grass trimmer is an essential tool for maintaining a neat and well-groomed lawn. However, if your grass trimmer only runs in choke, it can be frustrating and may require troubleshooting. This article outlines some solutions to fix the problem and get your grass trimmer working efficiently again.
Understanding the Choke Mechanism
The choke mechanism in a grass trimmer allows you to regulate the fuel and air mixture in the carburetor with manual choke settings. The carburetor runs on a combination of fuel and air, which burns in the engine cylinder and produces power. The choke lever controls a vent to the mixing chamber, which regulates air from the filter when the engine starts. When the choke is on, the vent is closed, blocking air from reaching the chamber. When the choke is off, air flows in from the air filter.
Check the Gas Cap
If your grass trimmer runs only in choke, the gas cap may be the problem. The check valve in the gas cap can become clogged and restrict the fuel flow. To check this, unscrew the gas cap halfway while the engine is running on choke. Turn off the choke and assess whether the engine is still running. If it is, remove the gas cap and clean it thoroughly with warm, soapy water. If it is too dirty, replace it.
Replace Fuel Lines and Filter
The fuel lines and filter can also cause problems with the grass trimmer. Over time, the fuel lines may become brittle and crack, while the filter can become clogged. To fix this, empty the machine of any fuel and remove the fuel lines and filter. You can find replacement fuel lines and filters online or at a home improvement store. Attach the new fuel line to the carburetor and insert the new fuel filter to the fuel line.
Clean the Carburetor
If the above solutions don’t work, the carburetor may need cleaning. Check the seals to ensure they are not clogged or damaged, and remove the carburetor from the machine for inspection. Use a carburetor cleaning solution to clean it thoroughly. If the carburetor is damaged, purchase a carburetor rebuild kit and follow the instructions for disassembling and reassembling the carburetor.
Expert Assistance
In case your machine continues to run on choke, it could be a problem that only an expert mechanic can resolve. It’s possible that the issue lies with the crankshaft or piston, and a professional will be able to determine the exact problem for precise repairs. If your trimmer is old and the mechanic’s estimate, along with the cost of previous replacement parts, exceeds the value of your trimmer, you may want to consider purchasing a new one or exploring other options.