Yamaha YZ450F(S) Owner's Service Manual page 608

SETTING
Carburetor setting parts
(For EUROPE, CDN, AUS, NZ, ZA)
Part name
Main jet
(STD)
Lean
Pilot jet
(STD)
Lean
Jet needle
(STD)
Lean
7 - 10
T U N
Size Part number
Rich #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
Rich #52 4MX-14948-08
#50 4MX-14948-07
#48 4MX-14948-06
#45 4MX-14948-05
#42 4MX-14948-04
#40 4MX-14948-03
#38 4MX-14948-02
Rich #EMN 5JG-14916-MN
#EMP 5JG-14916-MP
#EMQ 5JG-14916-M1
#EMR 5JG-14916-MR
#EMS 5JG-14916-MS
#EMT 5JG-14916-MT
#EMU 5JG-14916-MU