Yamaha YZ450F(S) Owner's Service Manual page 606

SETTING
Carburetor setting parts
(For USA)
Part name
Main jet Rich
(STD)
Lean
Pilot jet Rich
(STD)
Lean
Jet needle Rich
(STD)
Lean
Rich
Lean
Rich
Lean
7 - 9
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
#158 4MX-14943-89
#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
NCVM 5TA-14916-VM
NCVN 5TA-14916-VN
NCVP 5TA-14916-VP
NCVQ 5TA-14916-V1
NCVR 5TA-14916-VR
NCVS 5TA-14916-VS
NCVT 5TA-14916-VT
NDJN 5TA-14916-JN
NDJP 5TA-14916-JP
NDJQ 5TA-14916-J1
NDJR 5TA-14916-JR
NDJS 5TA-14916-JS
NCYN 5TA-14916-YN
NCYP 5TA-14916-YP
NCYQ 5TA-14916-Y1
NCYR 5TA-14916-YR
NCYS 5TA-14916-YS