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Multiple models matched. Select your model to confirm fit.

Duck bill valve

Small engine primer bulb. The primer bulb draws additional fuel into the carburetor to help start the engine.

Primer bulb. The primer bulb draws fuel into the carburetor to make the engine easier to start.

Walbro primer bulb. The primer bulb draws additional fuel into the carburetor to make the engine easier to start. If the primer bulb is leaking, replace it.

Champion spark plug (RCJ6Y). The spark plug ignites the fuel and air mixture in the engine's cylinder to power the engine. If the spark plug is has fouled (if the tip of the spark plug is burnt or damaged), the engine may not start or may run rough.

String trimmer spool cover.

Homelite rewind spring (recoil spring) and container. If the rewind spring is broken, the starter rope won't retract.

String trimmer bump knob (or spool retainer) with left-hand threads. Color: red.

Shaft housing assembly

Homelite compression spring. Pushes bump knob back out after string is released.

Self Tapping Screw

Rope for pull starter

Stop switch

Homelite fuel line clip.

Compression spring
Homelite string trimmers are budget-friendly, entry-level equipment — and when they stop running or won't cut, the fix is usually straightforward. Most Homelite trimmer problems trace back to the same handful of parts: a clogged carburetor from stale fuel, a cracked fuel line, a jammed trimmer head, or a fouled spark plug. These are all inexpensive fixes that keep your trimmer in the yard instead of the landfill.
Enter your Homelite model number above to find the exact parts your trimmer needs. Repair Clinic stocks OEM Homelite parts — carburetors, fuel lines, trimmer heads, spark plugs, and primer bulbs — so you get the right fit, not a guessed-at aftermarket substitute.
A clogged carburetor from old or ethanol-blended fuel is the #1 reason Homelite trimmers won't start. If your trimmer sat over winter or a season without use, the fuel inside the carburetor evaporates and leaves sticky varnish that clogs the jets and needle seat. A carburetor rebuild kit or fresh carburetor often solves it. If the trimmer ran fine when you stored it, fuel gumming is almost certainly the culprit.
The model number is stamped or molded into the plastic housing, usually on the shaft or near the engine. It looks like UT-08050, UT-20002, or similar. You need it because Homelite made many trimmer variants over the years, and some parts (especially the carburetor, fuel tank, and trimmer head) are model-specific. Entering your model number into Repair Clinic's lookup will show you exactly which parts fit — no guessing, no wrong orders.
Not reliably. Homelite trimmer heads are sized and threaded for specific shafts. A universal head might fit the shaft but won't feed line correctly or may fall off during use. OEM Homelite trimmer heads are inexpensive ($15 to $30) and come pre-assembled — use the right one for your model. Check your model number against the Homelite parts diagram to confirm the exact head you need.
No — the primer bulb draws fuel from the tank into the carburetor before start. Without it, you won't get fuel to the cylinder and the trimmer won't start. A cracked or missing primer bulb is a $3 to $8 fix that takes 30 seconds to swap. Replace it while you're in there.


Keep your Homelite string trimmer in top condition by ordering genuine replacement parts online. Our huge inventory makes it easy to find the right parts for your weed eater, whether it's a spark plug, carburetor, or trimmer head. Take advantage of our same-day shipping to get your parts quickly and enjoy the convenience of model number lookup to easily find compatible parts. Our No-Hassle 365-Day Returns policy and Price Match Guarantee provide added peace of mind. Common issues like a trimmer that won't start or runs rough can often be resolved with new spark plugs or air filters. For guidance on troubleshooting and repairs, visit our String Trimmer Repair Help section. Looking for more specific parts? Check out our extensive range of Homelite String Trimmer Parts for all your repair needs.
Homelite usually places the model number on the main housing near the engine or on a label along the shaft. Check the plastic housing, handle area, and around the engine for a printed or molded number that may look like UT-08050, UT-20002, or a similar combination of letters and numbers. Your owner's manual may also list it. Once you have the number, type it into our model number lookup and the catalog narrows to parts made for your unit. This filters the full Homelite String Trimmer parts selection, not just one category, so you can match parts to the complete trimmer. It is the quickest way to be sure the part fits before you order.

Whether you own a Homelite String Trimmer or work on one professionally, Repair Clinic's online repair help covers what you need. Start with a symptom guide to narrow the likely cause, then use the model number lookup to confirm the correct replacement part. Written repair instructions and matching videos walk you through each step of the installation for a clean, first-time repair.

Learn the correct way to replace your string trimmer line for proper function. Follow these simple steps to ensure smooth trimming and prevent frustrating tangles or breakage.

Is your string trimmer head not spinning? Common causes include a worn drive shaft, faulty clutch, broken trimmer head, or tangled line. Diagnose and fix the issue with these expert tips.

A faulty spark plug can cause engine misfires, hard starts, rough idling, or power loss. Learn how to recognize bad spark plug symptoms and when to replace them for smooth operation.