SERVICE INFORMATION
GT-220ES
SRM-220ES
7
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. Two nylon line head with properly cut lines is recommended to be installed for proper engine loading.
B. Start and run engine for 3
minutes alternating engine speed between WOT for 10 seconds and idle for
5 seconds. Adjust idle speed screw to 3,000 +/- 100 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 in Idle and Hi speed mixture needle(s) hole(s) to comply with Emission Directive.
2-2 Initial Idle adjust screw, Idle mixture needle and Hi speed mixture needle settings
Parts Required : (2) limiter plug P/N P005-001270
1. Remove plugs from Idle mixture needle hole (A)
and Hi speed 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) Turn limiter plug tool anticlockwise 2 turns slow-
ly into limiter plug while pushing the tool.
3) Pull out limiter plug tool with the limiter plug from
mixture needle hole.
NOTE :
If plug is damaged and stays in the hole,
use hand auger or pin-shaped tool to scrape and
lift the plug pieces out of the hole.
2. Turn Idle mixture needle (D) clockwise completely until lightly seated. Then turn it anticlockwise 2 3/4
turns. Turn Hi speed mixture needle (G) clockwise until lightly seated. Then turn it anticlockwise 1 3/8 turn.
3. Turn Idle adjust screw (E) anticlockwise until screw tip just touches throttle plate (F). Then turn it in
clockwise 1 1/2 (GT-220ES), 2 1/2 (SRM-220ES) 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, the variance would be ignorable.
(A)
(B)
(G)
(A)
(E)
(F)
(D)
(C)
1)
2)
3)
(E)
