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TECHNICAL DATA - CARBURETOR 92
7(&+1,&$/'$7$&$5%85(725
450bEXC-RbEU, 450bEXC-RbAUS/UK (3900I)
Carburetor type KEIHIN FCR-MX 39
Carburetor identification number 3900I
Needle position 4th position from top
Idle mixture adjusting screw
Open 1.75bturns
Pump membrane stop 2.15bmm (0.0846bin)
Main jet 180
Jet needle OBDYU (OBDTQ)
Idling jet 40
Main air jet 200
Idle air jet 100
Cold start jet 65 (85)
Leakage nozzle 40
Throttle slide 15
Slide stop present
450bEXC-RbSIXbDAYS, 450bEXC-RbUSA, 450bXCR-W (3900L)
Carburetor type KEIHIN FCR-MX 39
Carburetor identfication number 3900L
Needle position (450bXCR-WbUSA) 1st position from top
Needle position (450bEXC-RbSIXbDAYS) 3rd position from top
Needle position (450bEXC-RbUSA, 450bXCR-WbZA) 4th position from top
Idle mixture adjusting screw (450bXCR-WbUSA)
Open 0.5bturn
Idle mixture adjusting screw (450bEXC-RbSIXbDAYS)
Open 1.0bturn
Idle mixture adjusting screw (450bXCR-WbZA)
Open 1.5bturns
Idle mixture adjusting screw (450bEXC-RbUSA)
Open 1.75bturns
Pump membrane stop 2.15bmm (0.0846bin)
Main jet (450bEXC-RbSIXbDAYS, 450bEXC-RbUSA, 450bXCR-
WbUSA)
180
Main jet (450bXCR-WbZA) 185
Jet needle (450bXCR-W, 450bEXC-RbSIXbDAYS) OBDTQ
Jet needle (450bEXC-RbUSA) OBDYU
Idling jet (450bXCR-W, 450
bEXC-RbSIXbDAYS)
40
Idling jet (450bEXC-RbUSA) 48
Main air jet 200
Idle air jet 100
Cold start jet 85
Leakage nozzle 40
Throttle slide 15