SERVICE INFORMATION
CS-310ES
7
B
A
B
A
2 CARBURETTOR ADJUSTMENT PROCEDURE
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 muf
fl
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. The recommended bar and chain must be installed, and properly tensioned.
NOTE :
In order to achieve proper carburettor adjustment, a 30 or 35 cm bar and chain combination
should be installed on the unit, otherwise serious engine damage will occur due to overspeeding.
B. Set L and H mixture needle anticlockwise to rich side stop. Start and run engine for two minutes al-
ternating r/min between WOT and idle every 5 seconds. Adjust idle adjust screw to 3,200 +/- 200 r/min.
Adjust H mixture needle to 12,500 +/- 300 r/min with limiter cap. If engine does not run correctly after this
adjustment, proceed to the next step 2-2.
IMPORTANT : After adjusting carburettor according to the steps 2-2 and 2-3, the limiter cap(s)
must be installed on L and H mixture needle(s) to comply with Emission Directive.
2-2 Presetting Idle adjust screw, L mixture needle and H mixture needle
Tools Required : Small screwdriver with 2.5 mm
blade, electronic tachometer P/N 897801-33330,
limiter cap removal tool with 2.5 mm left-hand
thread P/N 91019. Parts Required : (2) limiter caps
P/N P003-000010.
1. Turn the L and H mixture needles anticlockwise
to rich side stop to align limiter cap tab (A) with lo-
cating slot (B), using 2.5 mm blade screw driver.
NOTE :
If cap tabs (A) misalign with locating slots
(B), the cap cannot be removed and the centre
hole threads will strip.
(continued)