Carburetor Adjustment, Exhaust Port Cleaning

MAINTENANCE	PAS-280

Exhaust Port Cleaning

Level 2.

Parts Required: As needed: Heat Shield

1.Remove spark plug lead from spark plug, and remove muffler cover.

2.Place piston at top dead center. Remove muffler (A), heat shield (B), and eye plate (C).

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 heat shield, and replace if damaged.

5.Install heat shield, muffler, and eye plate.

6.Tighten muffler mounting bolts (or nuts) to 53-70 in•lbf (60-80 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 specifications.

Carburetor Adjustment

Level 2.

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.

If the engine is adjusted for operation above 1,100 feet ASL, the carburetor must be re-adjusted when operating the engine below 1,100 feet ASL, otherwise severe engine damage may result.

Parts None

Required:

22	X7502312904