English, Technical data – engine – KTM 450 SX User Manual
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TECHNICAL DATA – ENGINE
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BASIC CARBURATOR SETTING
250 EXC RACING
EU
400 EXC RACING
EU
400 EXC-G RACING
USA
450 EXC RACING
EU
Type
Keihin FCR-MX 3700B Keihin FCR-MX 3900D Keihin FCR-MX 3900D Keihin FCR-MX 3900E
Main jet
160
178
178
178
Jet needle
OBEKT
OBDVR
OBDVR
OBDVR
Idling jet
42
42
42
42
Main air jet
200
200
200
200
Idling air jet
100
100
100
100
Needle position
3
rd
from top
1
st
from top
1
st
from top
3
rd
from top
Starting jet
85
85
85
85
Mixture control screw open
0,75
1,25
1,25
1,25
Slide
15
15
15
15
Performance restrictor
Slide stop
Slide stop
–
Slide stop
Stop pump membrane
858 / 2,15 mm
858 / 2,15 mm
858 / 2,15 mm
858 / 2,15 mm
Hot start device
–
–
–
–
BASIC CARBURATOR SETTING
450 EXC-G / XC-G
RACING
USA
450 EXC RACING
SIXDAYS
EU
450 SX RACING
525 EXC /
XC RACING DESERT
EU
Type
Keihin FCR-MX 3900E Keihin FCR-MX 3900E Keihin FCR-MX 4122B Keihin FCR-MX 3900F
Main jet
178
182
185
178
Jet needle
OBDVR
OBDTR
OBDTP
OBDVT
Idling jet
42
42
40
42
Main air jet
200
200
200
200
Idling air jet
100
100
100
100
Needle position
3
rd
from top
4
th
from top
4
th
from top
3
rd
from top
Starting jet
85
85
85
85
Mixture control screw open
1,25
2,0
1,5
1,25
Slide
15
15
15
15
Performance restrictor
–
–
–
Slide stop
Stop pump membrane
858 / 2,15 mm
858 / 2,15 mm
858 / 2,15 mm
858 / 2,15 mm
Hot start device
–
–
2,2 mm
–
BASIC CARBURATOR SETTING
525 XC-G / EXC-G
RACING
USA
525 EXC RACING
SIXDAYS
EU
525 SX RACING
Type
Keihin FCR-MX 3900F Keihin FCR-MX 3900F Keihin FCR-MX 4125C
Main jet
178
182
185
Jet needle
OBDVT
OBDTR
OBDTP
Idling jet
42
42
42
Main air jet
200
200
200
Idling air jet
100
100
100
Needle position
3
rd
from top
5
th
from top
4
th
from top
Starting jet
85
85
85
Mixture control screw open
1,25
2,0
1,5
Slide
15
15
15
Performance restrictor
–
–
–
Stop pump membrane
858 / 2,15 mm
858 / 2,15 mm
858 / 2,15 mm
Hot start device
–
–
2,5 mm