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Wa t e r Pu m P
OP e r a t O r 's ma n u a l
21
c a r b u r e t o r a d j u s t m e n t
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 ad-
justed 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.
(Emission models with limiter caps)
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 com-
pliance with emission regulations. In addition, the carburetor is
equipped with HI (A) and LO (B) needle adjustment limiters that
prevent settings outside acceptable limits.
1. Before adjusting the carburetor, clean or replace the air lter and
spark arrester screen.
2. Fill pump housing with clean water.
3. Start engine and run for several minutes to reach operating tempera-
ture.
4. Stop engine. Turn HI (A) speed needle CCW (counter clockwise)
to stop. Turn LO (B) speed needle midway between full CCW and
CW (clockwise) stops.
5. Idle Speed Adjustment.
-Start engine and turn idle (C) speed adjustment screw CW until the
engine speed reaches 3000 RPM. Turn screw CCW an additional
1/4 turn.
6. Accelerate to full throttle for 2-3 seconds to clear excess fuel from
engine then return to idle. Accelerate to full throttle to check for
smooth transition from idle to full throttle. If engine hesitates, turn
LO (B) needle CCW an additional 1/8 turn and repeat acceleration.
Continue adjusting until smooth acceleration results.
7. Check HI (A) speed RPM at W.O.T. (Wide Open Throttle). HI
speed RPM should be set to specications found on page 27 "Speci-
cations" of this manual.
8. Check idle speed and reset if necessary. If a tachometer is avail-
able, idle speed should be set to the specication found on page 27
"Specications" of this manual.