SERVICE INFORMATION
7
CS-3700ES
CS-4200ES
B
A
A
B
2 EMISSION ADJUSTMENT GUIDE
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 filter element must be clean and properly installed.
3. The muffler exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel filter 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” 2-
stroke oil.
6. The recommended bar and chain must be installed, and properly tensioned.
NOTE : In order to achieve proper carburettor adjustment, 38 cm bar and chain should be installed on the
unit. Otherwise serious engine damage will occur due to overspeeding.
B. Set L and H mixture needles full anticlockwise. Start and run engine for two minutes alternating engine
speed between WOT and idle every 5 seconds. Adjust idle speed screw to 2,700 +/- 200 r/min. Adjust H
mixture needle to 12,000 +/- 500 r/min. 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
1. Turn the L and H mixture needles anticlockwise
to rich side stop to align limiter cap tab (A) with
locating slot (B), using 2.5 mm blade screwdriver.
NOTE : If cap tabs (A) misalign with locating slots
(B), there is a chance to strip thread.
(continued)
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