Echo QV-670 Instruction Manual - Troubleshooting
1
4
CAUSE
Air cleaner clogged.
Carburetor out of adjustment.
Muffler clogged.
Clogged exhaust ports.
Poor compression.
Insufficient oil in fuel mixture.
Airflow obstructed.
Spark plug incorrect heat range.
Worn bearings, piston rings or
cylinder walls.
Carburetor main adjustment too
“lean”.
Engine overheats.
Empty oil tank.
Oil filter clogged.
Automatic oiler output set too low.
Chain brake adjustment.
Chain tension too tight.
Chain tension is too loose.
TROUBLE
4. Engine lacks power.
5. Engine overheats.
6.Engine noisy or knocking.
7.Engine “stalls” under load.
8.No oil on chain.
9. Chain brake fails to work.
10. Chain binds.
11. Chain is loose on bar.
WHAT TO DO
Clean air cleaner.
See “Carburetor Adjustment”.
Clean carbon from muffler.
Remove muffler, rotate engine until
the piston is at bottom of cylinder.
With a wooden scraper or blunt tool,
remove all carbon from exhaust ports.
Be careful not to scratch or damage
piston or cylinder walls. Blow out loose
carbon with compressed air. Start
engine and run briefly to remove all
carbon, then install muffler and gasket.
Contact your nearest authorized
dealer.
Mix fuel as shown in starting
instructions.
Clean flywheel and cylinder fins.
Replace with plug specified for engine.
Contact your nearest authorized
dealer.
See “Carburetor Adjustment”.
See “Cleaning Cylinder Fins” in
maintenance section.
Fill tank.
Replace filter.
Adjust oiler output.
Adjust chain brake.
Adjust chain tension.
Adjust chain tension.