Echo HC-235 - Manual (Page 19)

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Exhaust Port Cleaning
Level 2.
Tools required: 4 mm Hex wrench, Wood or plastic scraper
Parts Required: As needed: Heat Shield
1. Remove spark plug lead from spark plug, and remove engine 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 engine 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.
A B
carburetor adjustment
WARNING
The blades must not move at idle, otherwise serious personal injury
may result. Periodic carburetor adjustment may be necessary to as-
sure blades do not move at idle.
If blades move, readjust carburetor according to these instructions,
or see your ECHO Dealer
Engine Break-In
New engines must be operated a minimum duration of two tanks of fuel
break-in before carburetor adjustments can be made. During the break-
in period your engine performance will increase and exhaust emissions
will stabilize. Idle speed can be adjusted as required.