Symptoms
- Pull cord doesn't start the engine
- Engine turns over but doesn't fire
- Engine dies immediately after starting
- Chute or hopper cover not fully seated
Likely causes
- CommonSafety interlock switch not engagedMost chippers won't start unless the hopper or chute is fully closed and latched.
- CommonStale fuelOld gas prevents proper combustion.
- CommonFouled spark plugCarbon buildup weakens the spark.
- PossibleClogged air filterDust from wood chipping can quickly clog filters.
- PossibleJammed feed rollers or blades from a previous jamDebris left in the chute can prevent the engine from turning freely.
What to do
- Check that all hopper covers and chutes are fully closed and latched, since safety switches block starting otherwise.
- Drain stale fuel and refill with fresh gasoline.
- Pull the spark plug and check for fouling; clean or replace it.
- Check and clean the air filter, which clogs quickly from wood dust.
- With the spark plug disconnected, check the feed rollers and blade area for jammed debris.
- Verify the on/off switch is in the run position.
- If it still won't start, a small-engine shop can test the ignition and carburetor.
Tools and parts
- Spark plug socket
- Fresh gasoline
- Replacement air filter
Wood chipper air filterSearch: “wood chipper air filter replacement”
Spark plugSearch: “wood chipper spark plug”
When to call a pro
If the ignition system tests fine but it still won't start, a small-engine repair shop can inspect the carburetor and internal components.
Safety
Use caution
Never reach into the hopper or chute while the engine is running or could start; always disconnect the spark plug before clearing jams.