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57
BASIC CARBURATOR SETTING
400 XC-W
USA
400 EXC RACING
EU
Type
Keihin FCR-MX 3900D Keihin FCR-MX 3900E
Main jet 178 178
Jet needle OBDVR OBDVR
Idling jet 42 42
Main air jet 200 200
Idling air jet 100 100
Needle position 1st from top 1st from top
Starting jet 85 85
Mixture control screw open 1.25 1.25
Slide 15 15
Performance restrictor – Slide stop
Stop pump membrane 858 / 2.15 mm 858 / 2.15 mm
BASIC CARBURATOR SETTING
450 XC, XC-W
USA
450 EXC RACING
EU / AUS
450 EXC RACING
SIXDAYS
EU
Type
Keihin FCR-MX 3900E Keihin FCR-MX 3900E Keihin FCR-MX 3900E
Main jet 178 178 182
Jet needle OBDVR OBDVR OBDTR
Idling jet 42 42 42
Main air jet 200 200 200
Idling air jet 100 100 100
Needle position 3rd from top 3rd from top 4th from top
Starting jet 85 85 85
Mixture control screw open 1.25 1.25 2.0
Slide 15 15 15
Performance restrictor – Slide stop –
Stop pump membrane 858 / 2.15 mm 858 / 2.15 mm 858 / 2.15 mm
BASIC CARBURATOR SETTING
525 XC, XC-W
USA
525 EXC RACING EU
525 EXC RACING AUS
525 XC
DESERT RACING EU
525 EXC RACING
SIXDAYS
EU
Type
Keihin FCR-MX 3900F Keihin FCR-MX 3900F Keihin FCR-MX 3900F
Main jet 178 178 182
Jet needle OBDVT OBDVT OBDTR
Idling jet 42 42 42
Main air jet 200 200 200
Idling air jet 100 100 100
Needle position 3rd from top 3rd from top 5th from top
Starting jet 85 85 85
Mixture control screw open 1.25 1.25 2.0
Slide 15 15 15
Performance restrictor – Slide stop –
Stop pump membrane 858 / 2.15 mm 858 / 2.15 mm 858 / 2.15 mm