Echo PB-620ST Operator's Manual page 19

Exhaust Port Cleaning
Level 2.
Tools required: 4 & 5 mm Hexagon wrench, Cross head screwdriver,
Wood or plastic scraper
Parts Required: As needed: Heat Shield
1. Remove spark plug lead from spark plug, and remove engine or
muffler cover (5 screws).
2. Place piston at top dead center. Remove muffler (A) gasket (B),
and heat shield (C).
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 (C) and gasket (B) and replace if damaged.
5. Install heat shield (C), gasket (B), and muffler (A).
6. Tighten muffler mounting bolts (or nuts) to 110-130 in•lbf
(130-150 kgf•cm).
7. Install engine cover.
8. Attach spark plug lead.
9. Start engine, and warm to operating temperature.
10. Stop engine, and re-tighten mounting bolts (or nuts) to specifica-
tions.
P B
ower lower
o ' M
Perator s
A
B
C
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anual