KTM 450 EXC-R EU - Manual (Page 94)

TECHNICAL DATA - CARBURETOR
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450 bEXC-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 1.75 bturns
Pump membrane stop 2.15 bmm (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

450 bEXC-RbSIXbDAYS, 450bEXC-RbUSA, 450bXCR-W (3900L)
Carburetor type KEIHIN FCR-MX 39
Carburetor identfication number 3900L
Needle position (450 bXCR-WbUSA) 1st position from top
Needle position (450 bEXC-RbSIXbDAYS) 3rd position from top
Needle position (450 bEXC-RbUSA, 450bXCR-WbZA) 4th position from top
Idle mixture adjusting screw (450 bXCR-WbUSA)
Open 0.5 bturn
Idle mixture adjusting screw (450 bEXC-RbSIXbDAYS)
Open 1.0 bturn
Idle mixture adjusting screw (450 bXCR-WbZA)
Open 1.5 bturns
Idle mixture adjusting screw (450 bEXC-RbUSA)
Open 1.75 bturns
Pump membrane stop 2.15 bmm (0.0846bin)
Main jet (450 bEXC-RbSIXbDAYS, 450bEXC-RbUSA, 450bXCR-
W bUSA)
180
Main jet (450 bXCR-WbZA) 185
Jet needle (450 bXCR-W, 450bEXC-RbSIXbDAYS) OBDTQ
Jet needle (450 bEXC-RbUSA) OBDYU
Idling jet (450 bXCR-W, 450bEXC-RbSIXbDAYS) 40
Idling jet (450 bEXC-RbUSA) 48
Main air jet 200
Idle air jet 100
Cold start jet 85
Leakage nozzle 40
Throttle slide 15