Echo SRM-225 Operator's Manual page 22

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1. Remove engine cover screws (2) and engine cover (B).
2. Place piston at Top Dead Center (TDC) to prevent carbon/dirt from
entering cylinder.
3. Remove spark arrestor screen cover (C), gaskets (D), (E), and
screen (F), from muffler body.
4. Clean carbon deposits from muffler components.
NOTE
When cleaning carbon deposit, be careful not to damage the cata-
lytic element inside muffler.
5. Replace screen if it is cracked, plugged, or has holes burned
through.
6. Assemble components in reverse order.
Exhaust Port Cleaning
Level 2.
Tools required:
Torx T27 L-Wrench, Wood or plastic scraper
Parts Required: As needed: Heat Shield
1. Remove spark plug lead from spark plug, and remove muffler
cover (2 screws).
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.
IMPORTANT
Never use a metal tool to scrape carbon from the exhaust port.
Do not scratch the cylinder or piston when cleaning the exhaust
port. Do not allow carbon particles to enter the cylinder.
4. Inspect heat shield, and replace if damaged.
5. Install heat shield and muffler.
6. Tighten muffler mounting bolts (or nuts) to 80-95 in•lbf
(90-110 kgf•cm).
7. Install muffler cover and attach spark plug lead.
8. Start engine, and warm to operating temperature.
9. Stop engine, and re-tighten mounting bolts (or nuts) to specifica-
tions.
F
E
D
C
B A