Yamaha 2003 YZ450F Owner's Service Manual page 610

SETTING
Carburetor setting parts
Part name
Main jet Rich
(STD)
Lean
Pilot jet Rich
(STD)
Lean
Jet needle Rich
(STD)
Lean
7 - 8
T U N
Size Part number
#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
4MX-14943-89
#158
#155 4MX-14943-38
#152 4MX-14943-88
#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
#CVM 5TA-14916-VM
#CVN 5TA-14916-VN
#CVP 5TA-14916-VP
#CVQ 5TA-14916-V1
#CVR 5TA-14916-VR
#CVS 5TA-14916-VS
#CVT 5TA-14916-VT