Yamaha WR426F(N) Owner's Service Manual page 724

SETTING
EC71Q000
Carburetor setting parts
WR426F
Part name
Main jet Rich
(STD)
Lean
Pilot jet Rich
(STD)
Lean
Jet needle Rich
(STD)
Lean
Jet needle Rich
*(STD)
Lean
* Except for USA
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
#158 4MX-14943-89
#155 4MX-14943-38
#48 4MX-14948-06
#45 4MX-14948-05
#42 4MX-14948-04
#40 4MX-14948-03
#38 4MX-14948-02
#DRN 5GS-14916-RN
#DRP 5GS-14916-RP
#DRQ 5GS-14916-R1
#DRR 5GS-14916-RR
#DRS 5GS-14916-RS
#DRT 5GS-14916-RT
#DRU 5GS-14916-RU
#DQN 5GS-14916-1N
#DQP 5GS-14916-1P
#DQQ 5GS-14916-11
#DQR 5GS-14916-1R
#DQS 5GS-14916-1S
#DQT 5GS-14916-1T
#DQU 5GS-14916-1U