Use and Care Manual

PB-760 LN H/T MAINTENANCE

X7531125902 29

Exhaust Port Cleaning

Level 2.

1. Remove spark plug lead from spark plug.

2. Remove muffler cover and engine cover.

3. Place piston at top dead center. Remove muffler (A) muffler

gasket (B), and muffler insulator (C).

4. 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.

5. Inspect muffler gasket, and replace if damaged.

6. Install muffler insulator, muffler gasket and muffler.

7. Tighten muffler mounting bolts (or nuts) to 110-150 kgf•cm

(95-130 in•lbf).

8. Install engine cover and attach spark plug lead.

9. Start engine, and warm to operating temperature.

10. Stop engine, and re-tighten mounting bolts (or nuts) to

specifications.

11. Install muffler cover.

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.

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.

Level 2.

Parts Required: As needed: Muffler Gasket

Parts Required: None