Echo PB-265ESL - Manual (Page 7)

SERVICE INFORMATION PB-265ESL
7
2 CARBURETTOR ADJUSTMENT PROCEDUTER
2-1 General adjusting rules
A. Before starting the unit for adjustment, check the following items.
1. The correct spark plug must be clean and properly gapped.
2. The air fi lter element must be clean and properly installed.
3. The muffl er exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel fi lter are in good condition and clear of debris.
5. The fuel is fresh ( > 89 octane : RON ) and properly mixed at 50 : 1 with “ISO L-EGD” or “JASO FC/
FD” 2 stroke oil.
6. All blower pipes are installed for proper engine loading.
B. Start and run engine for 3 minutes alternating rpm between WOT for 50 seconds and idle for 10
seconds. Adjust idle speed screw to 3,000 +/- 200 r/min. If engine does not run correctly after this adjust-
ment, proceed to the next step 2-2.
IMPORTANT : After adjusting carburettor according to the steps 2-2 and 2-3, the limiter plug(s)
must be installed on Idle and hi speed mixture needle to comply with Emission Directive.
2-2 Presetting idle adjust screw, idle mixture needle and hi speed (H) mixture needle
Tools Required : Small screwdriver with 2.5 mm
blade, P/N 897801-33330 electronic tachometer,
P/N 91020 limiter plug removal tool. Parts Re-
quired : (2) P/N A259-000010 limiter plugs.
1. Remove plugs from Idle mixture needle hole (A)
and H mixture needle hole (B) using limiter plug
tool (C) as follows.
(1)Put limiter plug tool (C) on limiter plug in mixture
needle hole.
(2)Screw limiter plug tool anticlockwise 2 turns into
limiter plug pushing the tool again the plug to en-
gage the tool threads.
(3)Pull out limiter plug tool with the limiter plug
from mixture needle hole.
(4)Repeat plug removal procedure for the other
mixture needle.
NOTE : If the plug is damaged and left in the hole,
use a needle or pin-shaped tool to remove de-
formed plug pieces.
2. Turn hi mixture needle (B) clockwise until lightly
seated. And then turn hi speed mixture needle
counterclockwise 1 1/8 turns. Turn idle mixture
needle (A) clockwise until lightly seated. And then
turn L mixture needle anticlockwise 4 3/4 turns.
3. Turn idle adjust screw (D) clockwise until its
head touches boss (G) as shown Fig1. Then turn
idle adjust screw (D) anticlockwise 5 turns.
NOTE : Initial carburettor setting (Idle adjust screw, idle and hi speed mixture needles) shown here is to
start the engine after restoration or carburettor change. Idle adjust screw, idle and hi speed mixture nee-
dles turn for designated engine revolution through procedures indicated here may vary. As long as idle
and WOT engine speed is set in given range, variance would be ignorable.
(A)
(D)
(B)
(1)
(2)
(3)
(C)
(A)
(D)
(G)
Fig 1