
7 - 4
T U N
SETTING
1
Jet needle
2
Main air jet
3
Pilot air jet
4
Needle jet
5
Main jet
6
Pilot jet
7
Pilot screw
Main jet adjustment
The richness of the air-fuel mixture at full throt-
tle can be set by changing the main jet
1
.
If the air-fuel mixture is too rich or too lean, the
engine power will drop, resulting in poor accel-
eration.
Effects of changing the main jet (reference)
Å
Idle
ı
Fully open
Standard main jet
#178
1/4
1/2
3/4
+10%
#178
–10%
#188
#168
Å
ı
Содержание YZ250F(P)/LC
Страница 312: ...4 28 ENG 7 Install Oil tank breather hose Cylinder head breather hose Spark plug T R 13 Nm 1 3 m kg 9 4 ft lb CAMSHAFTS...
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Страница 666: ...PRINTED IN JAPAN 2001 8 1 7 1 CR E F G H PRINTED ON RECYCLED PAPER YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN...