Symptoms
- Choke lever won't move to the full choke or run position
- Lever moves but doesn't stay where set
- Engine hard to start because choke won't fully close or open
- Choke plate visibly stuck inside the carburetor throat
Likely causes
- CommonDirt or debris around the choke linkageGrass and dust accumulate around the external lever and internal plate.
- CommonCorroded or gummed choke shaftOld fuel varnish or rust can make the shaft bind inside the carburetor body.
- PossibleBroken detent spring or ballThe small spring that holds the lever in each position can wear out or pop loose.
- PossibleBent choke linkagePhysical damage to the external lever arm can prevent full travel.
- Less commonChoke plate stuck fully open or closedCarbon buildup inside the carburetor throat can jam the plate itself.
What to do
- Turn off the engine and inspect the choke lever and linkage for visible dirt, grass, or debris and clean it out.
- Move the lever back and forth by hand to check for smooth travel across its full range.
- If the shaft feels gritty or stuck, apply a small amount of carburetor cleaner to the shaft area and work it gently.
- Check inside the carburetor throat (with the air filter removed) for a visibly stuck choke plate and clean off carbon deposits.
- Inspect the external linkage for bends and straighten carefully or replace if damaged.
- If the detent spring is missing or broken, the choke won't hold position and needs a small-engine shop to replace it.
- Test starting behavior in both cold and warm conditions once the choke moves freely.
Tools and parts
- Carburetor cleaner spray
- Small screwdriver
Choke linkage kitSearch: “small engine choke linkage kit”
Carburetor rebuild kitSearch: “trimmer carburetor rebuild kit”
When to call a pro
If the choke plate is stuck inside the carburetor or the detent spring is broken, have a small-engine shop service the carburetor.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.