If the cord pulls out smoothly but then just dangles instead of snapping back, the fault is almost always inside the recoil starter housing, not in the engine. This is a mechanical fix, not a fuel or ignition one — and it’s usually a 20-30 minute job.
Safety first. Disconnect the spark plug lead before you do anything else. The recoil starter bolts straight onto the flywheel side of the engine, and an accidental pull with the plug connected can fire the engine while your hands are inside the housing.
What’s actually going on inside
The recoil starter is a simple mechanism: a flat coil spring sits in the centre of a pulley, wound tight. Pull the cord and the pulley spins, uncoiling the spring and turning the engine over. Let go, and the stored tension in the spring should spin the pulley back the other way, winding the cord neatly back onto it.
When the cord won’t retract, one of four things has usually happened:
- The recoil spring has broken. A snapped spring can’t pull anything back. This is the single most common cause, especially on older machines or ones that have been dropped.
- The spring has come unhooked or unwound from the pulley. The spring’s outer end hooks onto a tab inside the housing, and the inner end hooks onto the pulley hub. If either end slips off, the spring goes slack even though it’s not physically broken.
- The cord has jumped off the pulley groove. If the cord is wound unevenly or has frayed, it can ride up and over the edge of the pulley and jam against the housing wall, stopping the retract action even with a perfectly good spring.
- The unit has simply lost pre-tension. Over years of use, or after a repair where someone didn’t wind in enough turns, the spring has too little stored energy to fully retract the cord, especially if the cord is pulled out to its full length.
- Dirt, dried grass or old grease has gummed up the pulley. Grass seed and dust work their way in through the cord slot and cake around the pulley and spring, adding enough friction to stop a weak spring doing its job.
Diagnostic table
| What you see | Likely cause | What to check first |
|---|---|---|
| Cord comes out with no resistance at all, spins freely | Broken spring | Remove cover, inspect spring for a snapped coil |
| Cord retracts partway then stops | Lost pre-tension, or spring end has slipped off its hook | Re-tension per steps below |
| Cord retracts unevenly, catches, or grinds | Cord off the pulley groove | Open housing, re-seat cord in groove |
| Recently repaired, now weak | Not enough turns of pre-load put back in | Add 1-2 more turns of tension |
| Machine has sat unused for a season, cord sluggish | Dirt or dried debris in the housing | Clean and lightly grease the pulley |
| Cord frayed near the handle, retract action jerky | Worn cord catching on the housing edge | Inspect cord length; replace if frayed |
Step-by-step: opening the starter housing
- Disconnect the spark plug lead and set it well clear of the plug so it can’t arc.
- Remove the screws holding the recoil starter housing to the engine shroud — usually 3 or 4 Phillips or Torx screws around the outer edge.
- Lift the housing away. On most brush cutters it comes off as one unit without disturbing anything else.
- With the cord pulled out to its current length, turn the housing over so you can see the pulley and spring from the back or front, depending on the design.
- Look for the fault before touching anything:
- A broken spring will be obviously snapped, sometimes in two pieces rattling loose in the housing.
- A slipped spring will be sitting loose in the housing rather than coiled tight against its outer wall.
- A cord off the groove will be visibly bunched or crossed over itself instead of neatly wound.
Watch your fingers and eyes here. Even a “dead” recoil assembly can have some residual tension in the spring. Keep your face back when you lift the pulley off its spindle, and consider light gloves — a broken spring can have a sharp cut edge.
Fixing a slipped or under-tensioned spring
If the spring is intact but has come off its hook, or has simply lost tension, this is the most common repair and doesn’t need a new part.
- With the pulley out, hook the spring’s outer tail back onto its anchor point in the housing wall.
- Check the inner end of the spring is still properly hooked into the slot on the pulley hub. If it isn’t, reseat it — this alone is often the entire fault.
- Feed the cord back through the housing outlet and knot it (or refit the handle) so it can’t pull all the way through while you work.
- With the cord fully retracted into the pulley groove, wind the pulley by hand 3 to 4 full turns in the direction that tensions the spring (this loads the spring before the cord is even pulled).
- Holding that tension, feed the full length of cord out through the housing slot, letting the pulley rotate as the cord pays out.
- Refit the housing onto the engine, tighten the screws evenly, then reconnect the spark plug lead.
- Test: pull the cord to its full length and let go. It should snap back briskly and fully, not just partway.
If it retracts weakly, take the housing off again and add one more turn of pre-tension before refitting the cord. Add turns one at a time and re-test — over-tensioning strains the spring and can snap it on the next pull.
Fixing a cord that’s jumped the groove
- With the housing open, unwind the cord fully off the pulley by hand.
- Inspect the pulley groove for damage, burrs or a rough edge that might have caused the cord to jump in the first place.
- Rewind the cord neatly into the groove, turn by turn, keeping it flat and not overlapping.
- Re-tension as described above (3-4 turns of pre-load) before refitting the housing.
Replacing a broken spring
A snapped spring can’t be repaired — it needs replacing. Recoil springs are sold either as a standalone flat coil spring or, more commonly for consumer machines, as a complete recoil starter assembly (housing, pulley, spring and cord together), which is often simpler to fit than trying to work a bare spring into an old housing.
- Remove the old spring and pulley completely, noting how the spring sits against the housing wall.
- Fit the new spring, hooking its outer end onto the housing anchor first, then working it into its coiled position — some come pre-wound in a retaining strap that you slide into place and remove afterwards.
- Fit the pulley over the spring, engaging the inner spring hook into the pulley hub.
- Thread the cord, apply 3-4 turns of pre-tension, and refit as above.
A note on dirt and grease
If the mechanism looks clean and correctly hooked up but still feels sluggish, a smear of light grease on the pulley spindle and a wipe of the spring coils can restore smooth action. Don’t overdo it — too much grease attracts more dust and grass debris through the cord slot, which is exactly what caused the sluggishness in the first place on machines that live outdoors or in a dusty shed.
When to call a dealer
Take it to a dealer or repair shop if:
- You’ve reset tension and reseated the spring but it still won’t retract fully — there may be a cracked pulley or a housing that no longer holds the spring’s outer hook securely.
- The recoil assembly is a sealed, non-serviceable unit on your particular model (some budget machines use these) — in that case the whole assembly needs swapping, and it’s often easier to buy it pre-fitted.
- The spring has come apart in a way that’s hard to reason about, or you’re not confident releasing stored tension safely.
Quick checklist
- Spark plug lead off before opening anything.
- Open the housing, identify broken spring, slipped hook, or cord off the groove.
- Reseat or replace the spring as needed.
- Wind in 3-4 turns of pre-tension before feeding the cord back through.
- Refit, reconnect the plug lead, and test with a full-length pull.
- If it’s weak, add tension one turn at a time — never all at once.