FUEL SYSTEM
PB-8010, EB810
34
4-13 Adjusting carburetor
4-13-1 General adjusting rules
A. Before adjustment, check the following items.
1. The correct spark plug must be clean and properly gapped.
2. The air fi lters must be clean and properly installed.
3. The muffl er exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel strainer 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. All blower pipes are installed for proper engine loading.
B. Preliminary adjustment : Adjustment by Throttle adjust screw of carburetor.
Start and run engine for 30 seconds at idling and then run for 180 seconds at WOT (wide open throttle).
Verify idle engine speed ranges from 2,300 to 2,700 r/min, and WOT engine speed is over 7,500 r/min. If
idle engine speed is out of range, adjust throttle adjust screw to 2,300 - 2,700 r/min. Make sure WOT en-
gine speed is over 7,500 r/min again. If engine does not run correctly after this adjustment, proceed to the
next step 6-6-2.
4-13-2 Initial setting Throttle adjust screw, L mixture needle and H mixture needle
Tools required:
- Tachometer PET-1000R P/N 897802-33330
- Short type D-shaped tool(S) P/N 91159S
1. Remove carburetor cover.
2. Turn L and H mixture needles clockwise until
lightly seated, and then turn out both mixture nee-
dles following turns.
L mixture needle (A):
2 1 /2
H mixture needle (B):
1 3/4
NOTE:
If needles are overtightened during seat-
ing, damage to carburetor may occur.
3. Turn Throttle adjust screw (C) clockwise until its
head touches boss (D). Then turn Throttle adjust
screw (C) counterclockwise 9 1/4 turns.
NOTE:
The initial carburetor settings for Throttle
adjust screw, L and H mixture needles are intended
to start and run the engine before fi nal carburetor
adjustments are made through this procedure. The
actual number of turns needed for engine opera-
tion may vary.
A
B
C
D
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