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20
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 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.
Level 2.
Parts required:
None.
warning
Always operate unit in a clear work area. Keep hands clear of mov-
ing parts during adjustment otherwise serious bodily injury may
occur.
Idle Adjustment
Before adjustment make sure that:
• Air filter is clean and properly installed.
• Spark arrestor screen is free of carbon.
• Blower pipes are installed.
Start and run engine for 3 minutes at Wide Open Throttle (WOT).
Adjust idle speed screw to 3,000 +/- 300 RPM. If engine does not run
correctly after this adjustment, adjust carburetor.
1.
Turn Hi mixture needle (B) clockwise (CW) until lightly seated.
And then turn Hi mixture needle (CCW) 1 turn. Turn idle mixture
needle (A) (CW) until lightly seated. And then turn idle mixture
needle (A) (CCW) 3 3/4 turns.
2.
Turn idle adjust screw (D) (CW) until its head just touches boss
(G). Then turn it (CCW) 6 3/8 turns.
3. The muf er exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel lter are in good condit
5. The fuel is fresh ( > 89 octane :
M345-FC/FD" 2 stroke oil.
6. All blower pipes are installed for proper engine loading.
B. Adjustment with limiter plugs on carburetor.
Start and run engine for 3 minutes at WOT. Adjust idle spee
not run correctly after this adjustment, proceed to the next s
IMPORTANT : After adjusting carburettor according to the
be installed in Idle and Hi speed mixture needle(s) hole(s)
2-2 Presetting Idle adjust screw, Idle mixture needle and H
(D)
(B)
1)
(C)
(A)
8
(G)
(D)
Fig1
2-3 Adjusting carburetor
NOTE : The initial carburetor settings for Idle adjust sc
(E)
intended to start and run the engine before nal carbureto
meet Emission Regulations. The actual number of turns nee
(D)
(D)
RON+MON
2
(A)
2)
3)
(A)
(G)
SERVICE INFORMA
(D)
(A)
) and proper
Tools
blad
plug
limite
1. Re
and
tool (
(1)Pu
need
(2)Sc
2 tur
plug
(3)P
from
(4)R
mixtu
NOT
use
form
2. Tu
until
need
clock
mixtu
3. Tu
touch
adjus
1. Sta
ute.
2. Ad
mum
3. Se
adjus
3,400
ment
4. Tu
spee
The i
NOTE
a min
of L m
readi
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