Yamaha WR450F(S) Owner's Service Manual page 718

SETTING
Carburetor setting parts
Part name
Main jet Rich
(STD)
*(STD)
Lean
Pilot jet Rich
*(STD)
(STD)
Lean
Jet needle Rich
(STD)
Lean
Jet needle Rich
*(STD)
Lean
* Except for USA
7 - 8
T U N
Size Part number
#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
4MX-14943-38
#155
#152 4MX-14943-88
#150 4MX-14943-37
#52 4MX-14948-08
#50 4MX-14948-07
#48 4MX-14948-06
#45 4MX-14948-05
#42 4MX-14948-04
#40 4MX-14948-03
#DWN 5TJ-14916-WN
#DWP 5TJ-14916-WP
#DWQ 5TJ-14916-W1
#DWR 5TJ-14916-WR
#DWS 5TJ-14916-WS
#DWT 5TJ-14916-WT
#DWU 5TJ-14916-WU
#DUM 5TJ-14916-DM
#DUN 5TJ-14916-DN
#DUP 5TJ-14916-DP
#DUQ 5TJ-14916-D1
#DUR 5TJ-14916-DR
#DUS 5TJ-14916-DS
#DUT 5TJ-14916-DT