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 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. The recommended bar and chain must be installed, and properly tensioned.
NOTE :
In order to achieve proper carburettor adjustment, a 50 cm bar and chain should be installed on
the unit. Otherwise serious engine damage will occur due to overspeeding.
B. Adjustment with limiter caps on carburettor.
Set L and H mixture needles fully anticlockwise. Start and run engine for two minutes alternating engine
speed between WOT for 5 seconds and idle for 5 seconds. Adjust idle speed screw to 2,800 +/- 150
r/min. Adjust H mixture needle with limiter cap to 12,500 +/- 300 r/min. If engine does not run correctly af-
ter 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
and 4 mm blade, electronic tachometer P/N G310-
000050, 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 screwdriver.
NOTE :
If cap tabs (A) misalign with locating slots
(B), the cap cannot be removed and the centre
hole threads will strip. If centre hole threads strip,
use 3 mm diameter thread wood screw to remove
the limiter cap.
(continued)
SERVICE INFORMATION CS-610
8
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