Yamaha 2004 WR250FS Owner's Service Manual page 330

SETTING
EC71Q000
Carburetor setting parts
Part name
Main jet Rich
(STD)
* (STD)
Lean
Pilot jet Rich
(STD)
Lean
Jet needle Rich
(STD)
Lean
* Jet needle Rich
(STD)
Lean
Leak jet Rich
(STD)
* (STD)
Lean
* Except for USA
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
#165 4MX-14943-40
#162 4MX-14943-90
#160 4MX-14943-39
#158 4MX-14943-89
#50 4MX-14948-07
#48 4MX-14948-06
#45 4MX-14948-05
#42 4MX-14948-04
#40 4MX-14948-03
#38 4MX-14948-02
#35 4MX-14948-01
OBDUP 5TJ-14916-DP
OBDUQ 5TJ-14916-D1
OBDUR 5TJ-14916-DR
OBDUS 5TJ-14916-DS
OBDUT 5TJ-14916-DT
OBDUU 5TJ-14916-DU
OBDUV 5TJ-14916-DV
OBEKM 5JG-14916-EM
OBEKN 5JG-14916-EN
OBEKP 5JG-14916-EP
OBEKQ 5JG-14916-E1
OBEKR 5JG-14916-ER
OBEKS 5JG-14916-ES
OBEKT 5JG-14916-ET
#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
#110 4JT-1494F-29
#120 4JT-1494F-31