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HCAS-2200
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 gear case assembly with blade set adjusted clearance properly must be installed for proper engine
loading.
B. Start and run engine for 2 minutes alternating engine speed between WOT and idle every 5 seconds.
Adjust idle adjust screw to 2900 +/- 200 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 plug(s) must be
installed on Idle and H mixture needle(s) hole(s) to comply with Emission Directive.
2-2 Presetting idle adjust screw, idle mixture needle and H mixture needle
(A)
(B)
(F)
(E)
SERVICE INFORMATION
(G)
(D)
1. Remove plugs from idle mixture needle hole (A)
and H mixture needle hole (B) using limiter plug tool
(C) as shown.
(1) Put limiter plug tool (C) on limiter plug in needle hole.
(
2) Screw limiter plug tool anticlockwise 2 turns into limiter
.
plug
(3) Pull out limiter plug tool with the limiter plug from
needle hole.
(1)
(C)
NOTE : When plug is damaged and left in the hole,
use needle or pin-shaped tool to scrape.
2. Turn idle mixture needle (D) and H mixture needle
(G) clockwise until lightly seated. And then turn out
both needles following turns.
Idle mixture needle : 2
3. Turn idle adjust screw (E) anticlockwise until its
tip just touches throttle plate (F). Then turn it in
clockwise 2 1/2 turns.
(3)
(2)
H mixture needle : 2
7
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