Yamaha YZ250F(W) Owner's Service Manual page 642

SETTING
EC71Q000
Carburetor setting parts
Part name
Main jet Rich
(STD)
Lean
Pilot jet Rich
(STD)
Lean
Jet needle Rich
(STD)
Lean
Leak jet Rich
(STD)
Lean
* Leak jet Rich
(STD)
Lean
* Except for USA and CDN
7 - 9
T U N
Size Part number
#188 4MX-14943-95
#185 4MX-14943-44
#182 4MX-14943-94
#180 4MX-14943-43
#178 4MX-14943-93
#175 4MX-14943-42
#172 4MX-14943-92
#170 4MX-14943-41
#168 4MX-14943-91
#48 4MX-14948-06
#45 4MX-14948-05
#42 4MX-14948-04
#40 4MX-14948-03
#38 4MX-14948-02
OBEPM 5NL-14916-PM
OBEPN 5NL-14916-PN
OBEPP 5NL-14916-PP
OBEPQ 5NL-14916-P1
OBEPR 5NL-14916-PR
OBEPS 5NL-14916-PS
OBEPT 5NL-14916-PT
#50 4JT-1494F-07
#60 4JT-1494F-11
#70 4JT-1494F-15
#80 4JT-1494F-19
#90 4JT-1494F-23
#100 4JT-1494F-27
#110 4JT-1494F-29
#40 4JT-1494F-03
#50 4JT-1494F-07
#60 4JT-1494F-11
#70 4JT-1494F-15
#80 4JT-1494F-19
#90 4JT-1494F-23
#100 4JT-1494F-27