Tuning; Carburetor Tuning - Yamaha SXV70ERG Supplementary Service Manual

CARBURETOR TUNING

TUNING

CARBURETOR TUNING
The carburetors are set at the factory to run at
temperatures of 0_C X–20_C (32_F X–4_F)
at sea level. If the machine is to be operated un-
der conditions other than those specified
above, the carburetors must be properly ad-
justed. Special care should be taken in carbure-
tor setting so that the pistons will not be dam-
aged 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 supply the optimum fuel/oil mix-
ture depending on the throttle opening.
Therefore, after the carburetors have been
tuned or maintained, or after the float cham-
bers are removed for cleaning or jet replace-
ment, 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.
S Engine idle speed
S Throttle cable free play
S Carburetor synchronization
S Starter cable free play
S Oil pump cable free play
Carburetor tuning data
1. Standard specifications
Type
A
Manufacturer
B
C I.D. Mark
D Main jet (M.J.)
Pilot jet (P.J.)
E
Pilot screw (P.S.)
F
Float height
G
H Idle speed
–24–
INSP
ADJ
TM33
MIKUNI
8EK1 00
#156.3
#45
1-7/8 turns out
11.3 X 15.3 mm
(0.44 X 0.60 in)
1,800 " 100 r/min