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MAINTENANCE
Cleaning Cylinder Fins
1. Remove spark plug lead from spark plug, and remove
engine cover.
2. Clean cylinder fins to allow cooling air to pass freely.
3. Reassemble parts in reverse order.
Exhaust System
Spark Arrestor Screen
Level 2.
Parts Required:
Spark Arrestor Screen, Gasket
Carbon deposits in muffler will cause a drop in engine output and overheating. Spark arrestor screen must
be checked periodically.
1. Remove spark plug lead from spark plug, and remove
engine cover.
2. Remove spark arrestor cover (A), deflector (B), plate (C),
gasket (D), and spark arrestor screen (E) from muffler.
Replace screen if plugged with carbon deposits.
Note: When cleaning carbon deposits, be careful not to damage
the catalytic element inside muffler.
3. Clean carbon deposits from muffler components.
4. Install spark arrestor screen, gasket, plate, deflector, and
cover.
5. Loosely reassemble engine cover.
6. Tighten all screws securely.
7. Attach spark plug lead.
Exhaust Port Cleaning
Level 2.
Parts Required:
As needed: Heat Shield
1. Remove spark plug lead from spark plug, and remove
engine cover.
2. Place piston at top dead center. Remove muffler (A) and
heat shield (B).
3. Use a wood or plastic scraping tool to clean deposits from
cylinder exhaust port.
22
PB-250LN
E
D
C
B
A
B
A
X7501183303
© 3/2013 ECHO Inc.
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Need help?
Do you have a question about the PB-250LN and is the answer not in the manual?
Questions and answers
No spark to spark plug
Possible reasons for no spark on an Echo PB-250LN include:
1. Faulty Ignition Coil – Even if tested within specs, it may still fail under load.
2. Improper Coil Gap – Ensure correct spacing between the coil and flywheel.
3. Damaged Woodruff Key – A worn or sheared key can affect timing.
4. Defective On/Off Switch – Though tested, disconnect it to rule out failure.
5. Bad Spark Plug – Use only the recommended NGK BPM-8Y (or BPMR-8Y in Canada).
6. Grounding Issue – Ensure all grounding points are clean and secure.
7. Internal Engine Issues – A deeper mechanical failure may be preventing spark.
Checking each component systematically should help identify the issue.
This answer is automatically generated