SERVICE INFORMATION
GT-222ES, SRM-222ES
F226S, T226S, C226S
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. Install nylon line cutter with 2 nylon lines with 145 mm cut by shield knife, even if 3-tooth blade is in-
stalled, for proper engine loading to make sure engine speed on GT-222ES, SRM-222ES, F226S, T226S
and C226S.
B. Adjustment with limiter plugs on carburettor.
Start and run engine for 3 minute alternating engine speed between WOT for 50 seconds and idle for 10 sec-
onds. Adjust idle engine speed to 3,000 +/- 100 r/min by turning Idle adjust screw. Con
fi
rm WOT engine speed
approx. 9,500 r/min on SRM-222ES, T226S and C226S, and approx. 7,200 r/min on GT-222ES and F226S. 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 in Idle and Hi speed mixture needle(s) hole(s) to comply with Emission Directive.
2-2 Presetting Idle adjust screw, Idle mixture needle and Hi speed mixture needle
Tools Required : Small screwdriver with 2.5 mm
blade, P/N G310-000050 electronic tachometer,
P/N 91020 limiter cap tool with 2.5 mm left-hand
thread. 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)Screw limiter plug tool anticlockwise 2 turns into
limiter plug pushing the tool against the plug to en-
gage tool threads.
(3)Pull out limiter plug tool, with the limiter plug,
from mixture needle hole.
4) Repeat plug removal procedure for the other
mixture needle.
NOTE :
If the plug is damaged and left in the
hole, use a needle or pin-shaped tool to remove
deformed plug pieces.
2. Turn Idle mixture needle (A) clockwise completely until lightly seated. Then turn it anticlockwise 3
7/8
turns. Turn Hi speed mixture needle (B) clockwise until lightly seated. Then turn it anticlockwise 1 1/8
turns.
3. Turn Idle adjust screw (D) clockwise until its head touches boss. Then turn Idle adjust screw (D)
anticlockwise 8 7/8 turns.
NOTE :
The initial carburetor settings for Idle adjust screw, Idle and Hi speed mixture needles are intend-
ed to start and run the engine before
fi
nal carburetor adjustments are made to conform the unit to meet
Emission Directive. Actual turns required for engine operation may vary.
(C)
1)
2)
3)
(D)
(B)
(A)
