25
P
OWER
B
LOWER
O
PERATOR
'
S
M
ANUAL
5. Inspect muffler gasket, and replace if damaged.
6. Install muffler gasket and muffler.
7. Tighten muffler mounting bolts (or nuts) to 95-130 in•lbf
(110-150 kgf•cm).
8. Install engine cover and attach spark plug lead.
9. Install air filter cover.
10. Start engine, and warm to operating temperature.
11. Stop engine, and re-tighten mounting bolts (or nuts) to specifica-
tions.
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.
IMPORTANT
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.
Tools required:
Screwdriver, tachometer (Echo P/N 99051130017)
Parts required:
None.
NOTE
Every unit is run at the factory and the carburetor is set in compli-
ance with emission regulations. Carburetor adjustments, other
than idle speed, must be performed by an authorized ECHO dealer.
Summary of Contents for PB-770H
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