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CARBURETOR TUNING
2-35
TUNING
CARBURETOR TUNING
The carburetors are set at the factory to run at
temperatures of 0°C ~ –20°C (32°F ~ –4°F) at sea
level. If the machine is to be operated under
conditions other than those specified above, the
carburetors must be properly adjusted. Special
care should be taken in carburetor setting so that
the pistons will not be damaged or will not seize.
CAUTION:
Engine oil is mixed with fuel just before the fuel
enters the carburetors. During initial fuel flow to
the carburetors, it is not always possible to sup-
ply the optimum fuel/oil mixture depending on
the throttle opening. Therefore, after the carbu-
retors have been tuned or maintained, or after
the float chambers are removed for cleaning or
jet replacement, be sure to idle the engine for
about three minutes in order to avoid engine
trouble.
CAUTION:
Before performing the carburetor tuning, make
sure that the following items are set to
specification.
•
Engine idle speed
•
Throttle cable freeplay
•
Carburetor synchronization
•
Starter cable freeplay
•
Oil pump cable freeplay
Carburetor tuning data
1. Standard specifications
Å Type
ı Manufacturer
Ç I.D. Mark
Î Main jet (M.J.)
‰ Pilot jet (P.J.)
Ï Pilot screw (P.S.)
Ì Float height
Ó Idle speed
INSP
ADJ
TM33
MIKUNI
8DN10
#1: 147.5, #2, 3: 146.3
#42.5
1-1/8 turns out
11.3 ~ 15.3 mm
(0.44 ~ 0.60 in)
1,800 ± 100 r/min
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