Yamaha MM700F, Service Manual

Page: 122 / 589

2-44
INSP
ADJ
CARBURETOR TUNING
Low-speed tuning
The carburetors are built so that low speed tuning can
be done by adjusting the pilot mixture screw
2
and
throttle stop screw
1
.
CAUTION:
Never run the engine without the air intake si-
lencer installed. Severe engine damage may re-
sult.
1. Tighten the pilot mixture screw until it is lightly
seated and then back it out the specified number
of turns.
Pilot mixture screw
2
:
1-1/2 turns out
Pilot mixture screw effects:
Turn in
←
STD setting
→
Turn out
Leaner Richer
Mixture Mixture
2. Set the engine idle speed by turning the throttle
stop screw in (to increase engine speed) or out (to
decrease engine speed).
Engine idle speed:
1,600
±
100 r/min
3. If low-speed performance is still poor at higher
elevations under extreme conditions, the stan-
dard pilot jets may need to be replaced. In this
way, the proper air/fuel mixture is obtained.
NOTE:
In this case, use a larger numbered pilot jet to enrich
the air/fuel mixture.
Standard pilot jet:
#45
SCH2300
SCH2840