In-stock parts ship the same dayString Trimmer Repair FAQs: Troubleshooting, Parts & Fixes
Start with the symptom: no start, starts then stalls, rough running, head will not spin, head will not stop spinning, or line will not feed. From there, check simple fuel, spark, air, and trimmer head issues before replacing larger parts. Use string trimmer repair and troubleshooting to choose the closest problem path.
Use the full model number from your trimmer and match the part by both category and fitment. Common replacement parts include carburetors, spark plugs, starter assemblies, fuel tanks, drive shafts, spindles, springs, motors, and trimmer head parts. Start with string trimmer parts to filter by model number.
A string trimmer that will not start usually has a fuel, spark, or air problem. Check for old fuel, a clogged carburetor, a dirty air filter, a fouled spark plug, a cracked primer bulb, or a fuel line problem before replacing larger parts. Use string trimmer won't start troubleshooting for the full diagnostic path.
If the trimmer starts but dies after a few seconds, the carburetor may be clogged from old fuel or the fuel cap vent may be blocked. Try fresh fuel first, then inspect the carburetor, fuel filter, fuel lines, and cap vent. Use string trimmer starts then stalls troubleshooting to narrow the cause.
Rough running often points to stale fuel, a dirty carburetor, a clogged fuel filter, a dirty air filter, or a worn spark plug. Clean or replace the easy maintenance parts first, then consider rebuilding or replacing the carburetor if fuel flow is still uneven. See string trimmer runs rough troubleshooting for common causes.
If the engine runs but the head does not spin, inspect the drive shaft, clutch, gear case, coupler, and trimmer head connection. A stripped shaft, damaged coupler, or worn clutch can stop power from reaching the head. Use string trimmer head won't spin troubleshooting to identify the failed drive part.
A trimmer head that keeps spinning at idle usually means the clutch is staying engaged or the idle speed is too high. Check the idle setting first, then inspect the clutch shoes and springs for wear or binding. Use string trimmer head won't stop spinning troubleshooting before replacing parts.
Line feed problems are often caused by the wrong line size, tangled line, a worn spool, a damaged cap, or a jammed trimmer head. Remove the spool, rewind the line evenly, and check that the feed mechanism moves freely. See string trimmer line won't feed troubleshooting for more help.
Yes. Old fuel can leave sticky deposits that clog the carburetor and restrict fuel flow. Drain stale fuel, add fresh fuel mixed to the proper ratio for two-cycle engines, and try starting again before replacing the carburetor.
A clogged carburetor can cause hard starting, stalling, rough running, or a trimmer that only runs with the choke on. If cleaning the carburetor does not restore normal operation, the carburetor may need a rebuild kit or replacement.
Yes. A fouled, cracked, carbon-covered, or worn spark plug can prevent ignition or cause weak spark under load. Remove the plug, inspect the tip and porcelain, check the gap, and replace it if there is visible damage or heavy buildup. Match replacements through string trimmer spark plug parts.
If the trimmer idles but dies when you press the throttle, the engine may not be getting enough fuel or air under load. Check for a clogged carburetor, restricted fuel filter, cracked fuel line, dirty air filter, or blocked muffler screen. Fix fuel and airflow problems before adjusting the carburetor.
Yes. A clogged fuel filter can let the engine start, then starve it as soon as the throttle opens. Replace the filter if it is dirty, brittle, or if fuel flow from the tank looks weak.
The primer bulb pulls fuel into the carburetor so the engine can start more easily. If the bulb is cracked, stuck, leaking, or will not fill with fuel, inspect the fuel lines and carburetor connections before replacing the bulb.
Yes. A cracked tank, loose fuel line, or hardened fuel line can let air into the fuel system and keep the carburetor from drawing fuel correctly. Replace damaged fuel system parts and confirm the fuel cap seals properly. Check string trimmer tank and container parts when the tank itself is cracked or leaking.
A hard-to-pull starter can be caused by a jammed starter assembly, tangled rope, engine compression issues, or debris around the flywheel or clutch. Remove the starter housing and inspect the rope, pulley, pawls, and spring before assuming the engine is seized. Browse string trimmer starter parts if the starter assembly is damaged.
If the starter rope will not retract, the recoil spring may be broken, disconnected, or jammed with debris. Inspect the starter pulley and spring, then replace the recoil assembly or spring if it will not rewind smoothly.
Yes. If the spark plug is good but the trimmer still has no spark, the ignition coil may be faulty. Test for spark with a spark tester after confirming the stop switch is not shorted. If the coil has failed, match it through string trimmer ignition coil parts.
Yes. A shorted or stuck stop switch can ground the ignition circuit and prevent spark. If the trimmer has no spark and the plug and coil test correctly, inspect the switch and wiring for damage or poor connections.
Depending on the model, the engine or motor drives the head through a clutch, drive shaft, gear case, spindle, and coupler. If one of those parts strips, breaks, or disconnects, the head may stop spinning even though the engine still runs. Check string trimmer spindle parts when the head connection is worn or damaged.
Yes. The drive shaft transfers power from the engine or motor to the trimmer head. If it is stripped, broken, or disconnected from the coupler, the head will not rotate properly. Compare replacements through string trimmer drive shaft parts.
If an electric trimmer motor runs but the head does not turn, the issue is usually in the drive connection, spindle, coupler, or head assembly rather than the power supply. Inspect the shaft and head connection for stripped splines or broken hardware before replacing the motor.
Replace the motor only after confirming the trimmer has proper power, the switch works, and the head or drive shaft is not jammed. A motor that smells burnt, will not run with proper voltage, or has seized bearings may need replacement. Start with string trimmer motor parts when motor failure is confirmed.
Yes. A clogged spark arrestor screen or restricted muffler can limit exhaust flow and make the engine lose power, bog down, or stall. Let the engine cool, inspect the muffler and screen, and clean or replace restricted parts as needed. Review string trimmer muffler parts if the muffler is damaged.
Line that is too thin, old, brittle, overheated, or wound too tightly can break or stick inside the spool. Use the correct line diameter from the ownerÂ’s manual, avoid overfilling the spool, and make sure the head cap and eyelets are not worn.
Yes. A loose coupler, missing locking pin, or damaged fastener can let the shaft, handle, or attachment shift during use. Inspect the attachment connection and replace worn hardware before operating the trimmer again. Use string trimmer coupler parts if the attachment connection is worn.
Common DIY replacement parts include spark plugs, fuel caps, fuel lines, primer bulbs, spools, caps, trimmer heads, starter ropes, springs, tanks, handles, couplers, and some drive shaft parts. Always shut off the engine, disconnect the spark plug wire or battery, and let hot parts cool before starting the repair.
The model number is usually on a label or rating plate on the engine housing, starter housing, shaft, handle, or underside of the trimmer body. Write down the full model number, type, and serial number if shown, because small differences can change the correct carburetor, starter, fuel tank, drive shaft, or trimmer head part. Once you have the model number, use it to narrow the parts list before ordering.
Start with the symptom: no start, starts then stalls, rough running, head will not spin, head will not stop spinning, or line will not feed. From there, check simple fuel, spark, air, and trimmer head issues before replacing larger parts. Use string trimmer repair and troubleshooting to choose the closest problem path.
Use the full model number from your trimmer and match the part by both category and fitment. Common replacement parts include carburetors, spark plugs, starter assemblies, fuel tanks, drive shafts, spindles, springs, motors, and trimmer head parts. Start with string trimmer parts to filter by model number.
A string trimmer that will not start usually has a fuel, spark, or air problem. Check for old fuel, a clogged carburetor, a dirty air filter, a fouled spark plug, a cracked primer bulb, or a fuel line problem before replacing larger parts. Use string trimmer won't start troubleshooting for the full diagnostic path.
If the trimmer starts but dies after a few seconds, the carburetor may be clogged from old fuel or the fuel cap vent may be blocked. Try fresh fuel first, then inspect the carburetor, fuel filter, fuel lines, and cap vent. Use string trimmer starts then stalls troubleshooting to narrow the cause.
Rough running often points to stale fuel, a dirty carburetor, a clogged fuel filter, a dirty air filter, or a worn spark plug. Clean or replace the easy maintenance parts first, then consider rebuilding or replacing the carburetor if fuel flow is still uneven. See string trimmer runs rough troubleshooting for common causes.
If the engine runs but the head does not spin, inspect the drive shaft, clutch, gear case, coupler, and trimmer head connection. A stripped shaft, damaged coupler, or worn clutch can stop power from reaching the head. Use string trimmer head won't spin troubleshooting to identify the failed drive part.
A trimmer head that keeps spinning at idle usually means the clutch is staying engaged or the idle speed is too high. Check the idle setting first, then inspect the clutch shoes and springs for wear or binding. Use string trimmer head won't stop spinning troubleshooting before replacing parts.
Line feed problems are often caused by the wrong line size, tangled line, a worn spool, a damaged cap, or a jammed trimmer head. Remove the spool, rewind the line evenly, and check that the feed mechanism moves freely. See string trimmer line won't feed troubleshooting for more help.
Yes. Old fuel can leave sticky deposits that clog the carburetor and restrict fuel flow. Drain stale fuel, add fresh fuel mixed to the proper ratio for two-cycle engines, and try starting again before replacing the carburetor.
A clogged carburetor can cause hard starting, stalling, rough running, or a trimmer that only runs with the choke on. If cleaning the carburetor does not restore normal operation, the carburetor may need a rebuild kit or replacement.
Yes. A fouled, cracked, carbon-covered, or worn spark plug can prevent ignition or cause weak spark under load. Remove the plug, inspect the tip and porcelain, check the gap, and replace it if there is visible damage or heavy buildup. Match replacements through string trimmer spark plug parts.
If the trimmer idles but dies when you press the throttle, the engine may not be getting enough fuel or air under load. Check for a clogged carburetor, restricted fuel filter, cracked fuel line, dirty air filter, or blocked muffler screen. Fix fuel and airflow problems before adjusting the carburetor.
Yes. A clogged fuel filter can let the engine start, then starve it as soon as the throttle opens. Replace the filter if it is dirty, brittle, or if fuel flow from the tank looks weak.
The primer bulb pulls fuel into the carburetor so the engine can start more easily. If the bulb is cracked, stuck, leaking, or will not fill with fuel, inspect the fuel lines and carburetor connections before replacing the bulb.
Yes. A cracked tank, loose fuel line, or hardened fuel line can let air into the fuel system and keep the carburetor from drawing fuel correctly. Replace damaged fuel system parts and confirm the fuel cap seals properly. Check string trimmer tank and container parts when the tank itself is cracked or leaking.
A hard-to-pull starter can be caused by a jammed starter assembly, tangled rope, engine compression issues, or debris around the flywheel or clutch. Remove the starter housing and inspect the rope, pulley, pawls, and spring before assuming the engine is seized. Browse string trimmer starter parts if the starter assembly is damaged.
If the starter rope will not retract, the recoil spring may be broken, disconnected, or jammed with debris. Inspect the starter pulley and spring, then replace the recoil assembly or spring if it will not rewind smoothly.
Yes. If the spark plug is good but the trimmer still has no spark, the ignition coil may be faulty. Test for spark with a spark tester after confirming the stop switch is not shorted. If the coil has failed, match it through string trimmer ignition coil parts.
Yes. A shorted or stuck stop switch can ground the ignition circuit and prevent spark. If the trimmer has no spark and the plug and coil test correctly, inspect the switch and wiring for damage or poor connections.
Depending on the model, the engine or motor drives the head through a clutch, drive shaft, gear case, spindle, and coupler. If one of those parts strips, breaks, or disconnects, the head may stop spinning even though the engine still runs. Check string trimmer spindle parts when the head connection is worn or damaged.
Yes. The drive shaft transfers power from the engine or motor to the trimmer head. If it is stripped, broken, or disconnected from the coupler, the head will not rotate properly. Compare replacements through string trimmer drive shaft parts.
If an electric trimmer motor runs but the head does not turn, the issue is usually in the drive connection, spindle, coupler, or head assembly rather than the power supply. Inspect the shaft and head connection for stripped splines or broken hardware before replacing the motor.
Replace the motor only after confirming the trimmer has proper power, the switch works, and the head or drive shaft is not jammed. A motor that smells burnt, will not run with proper voltage, or has seized bearings may need replacement. Start with string trimmer motor parts when motor failure is confirmed.
Yes. A clogged spark arrestor screen or restricted muffler can limit exhaust flow and make the engine lose power, bog down, or stall. Let the engine cool, inspect the muffler and screen, and clean or replace restricted parts as needed. Review string trimmer muffler parts if the muffler is damaged.
Line that is too thin, old, brittle, overheated, or wound too tightly can break or stick inside the spool. Use the correct line diameter from the ownerÂ’s manual, avoid overfilling the spool, and make sure the head cap and eyelets are not worn.
Yes. A loose coupler, missing locking pin, or damaged fastener can let the shaft, handle, or attachment shift during use. Inspect the attachment connection and replace worn hardware before operating the trimmer again. Use string trimmer coupler parts if the attachment connection is worn.
Common DIY replacement parts include spark plugs, fuel caps, fuel lines, primer bulbs, spools, caps, trimmer heads, starter ropes, springs, tanks, handles, couplers, and some drive shaft parts. Always shut off the engine, disconnect the spark plug wire or battery, and let hot parts cool before starting the repair.