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TECHNICAL DATA - ENGINE »
BASIC CARBURATOR SETTING
250 EXC RACING
EU / AUS
11 kW
400 EXC RACING
EU / AUS
12 kW
400 EXC-G RACING USA 450 EXC RACING
EU / AUS
12 kW
Type
Keihin FCR-MX 3700A Keihin FCR-MX 3900C Keihin FCR-MX 3900C Keihin FCR-MX 3900A
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 / MXC-G
RACING USA
450 EXC RACING
SIXDAYS
450 SX RACING 525 EXC / MXC
RACING / DESERT RACING
EU / AUS 12 kW
Type
Keihin FCR-MX 3900A Keihin FCR-MX 3900A Keihin FCR-MX 4122A Keihin FCR-MX 3900B
Main jet 178 178 185 178
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 1,0 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 MXC-G / EXC-G
RACING USA
525 EXC RACING
SIXDAYS
525 SX RACING
Type
Keihin FCR-MX 3900B Keihin FCR-MX 3900B Keihin FCR-MX 4125A
Main jet 178 178 185
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