FUEL SYSTEM
32
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
4-5 Adjusting carburetor
4-5-1 General adjusting rules
A. Before adjustment, check the following items
1. Correct spark plug must be clean and properly gapped.
2. Air fi lter element must be clean and properly installed.
3. Muffl er exhaust port must be clear of carbon.
4. Fuel lines, tank vent and fuel strainer are in good condition and clear of debris.
5. Fuel is fresh ( > 89 octane :
RON+MON
) and properly mixed at 50:1 with “ISO L-EGD” or “JASO FC/
FD” 2-stroke oil.
6. Cut nylon trimmer line to proper length for proper engine loading to adjust carburetor.
SRM-2620ES, T262XS, C262S: 190 mm (7.5 inches)
SRM-2620TES, T262TXS, C262TS: 285 mm (11.2 inches)
B. Start and run engine for 180 seconds alternating RPM between idle for 10 seconds and WOT for 50
seconds. Adjust Idle speed screw to 3,000 +/- 200 RPM. If engine does not run correctly after this adjust-
ment, proceed to the next step 4-5-2.
4-5-2 Initial setting Throttle adjust screw, L mixture needle and H mixture needle
Tools Required : Small screwdriver with 2.5 mm
blade, P/N G310-000050 electronic tachometer,
P/N Y089-000094(A) small D-shaped tool.
1. Turn L mixture needle (B) clockwise(CW) until
lightly seated. Then turn it counterclockwise(CCW)
3 turns. Turn H mixture needle (C) CW until lightly
seated. Then turn it CCW 3 1/8 turns.
2. Turn Throttle adjust screw (D) CW until its head
touches boss(E). Then turn Throttle adjust screw
(D) CCW 7 3/4 turns.
NOTE:
The initial carburetor settings for Throttle
adjust screw, L and H speed mixture needles are
intended to start and run the engine before final
carburetor adjustments are made to conform the
unit to meet Emission Regulations. Actual number
of turns needed for engine operation may vary.
B
E
D
2
B
C
C
A