Use and Care Manual

EB770RT MAINTENANCE

X7531127000 33

1. Remove spark plug lead from

spark plug, and remove engine

cover.

2. Place piston at top dead center.

Remove muffler (A) and muffler

gasket (B).

3. Use a wood or plastic scraping

tool to clean deposits from

cylinder exhaust port.

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 muffler gasket, and

replace if damaged.

5. Install muffler gasket and muffler.

6. Tighten muffler mounting bolts

(or nuts) to 110-150 kgf•cm (95-

130 in•lbf).

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 specifications.

Carburetor Adjustment

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.

High Altitude Operation

This engine has been factory adjusted to maintain satisfactory starting,

emission, and durability performance up to 1,100 feet above sea level (ASL)

(96.0 kPa). To maintain proper engine operation and emission compliance

above 1,100 feet ASL the carburetor may

need to be adjusted by an

authorized ECHO service dealer.