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ORDER: 800-998-3529
TECH: 310-637-8330
Carburetor
Main Main
Slow
Slow
Jet
Throttle Vlv. Needle Float
Order
Jet
Air Jet
Jet
Air Jet
Needle
Cutaway Valve Seat Height
No.
FCR-MX37
#160
#200
#45
#100
OC-EMR
1.5
3.8
9mm
016-915
FCR-MX37 w/Air Cut Valve/Hot Start
#160
#200
#45
#100
OC-EMR
1.5
3.8
9mm
016-916
FCR-MX37 w/Air Cut Valve/Hot Start/TPS
#160
#200
#45
#100
OC-EMR
1.5
3.8
9mm
016-917
FCR-MX39
#160
#200
#45
#100
OC-EMR
1.5
3.8
9mm
016-925
FCR-MX39 w/Air Cut Valve/Hot Start
#160
#200
#45
#100
OC-EMR
1.5
3.8
9mm
016-926
FCR-MX39 w/Air Cut Valve/Hot Start/TPS
#160
#200
#45
#100
OC-EMR
1.5
3.8
9mm
016-927
FCR-MX41
#160
#200
#48
#100
OC-EMR
1.5
3.8
9mm
016-935
FCR-MX41 w/Air Cut Valve/Hot Start
#160
#200
#48
#100
OC-EMR
1.5
3.8
9mm
016-936
FCR-MX41 w/Air Cut Valve/Hot Start/TPS
#160
#200
#48
#100
OC-EMR
1.5
3.8
9mm
016-937
FCR-MX with Air Cut Valve, Hot Start & TPS
FCR-MX with Air Cut Valve & Hot Start
FCR-MX
FCR-MX Standard Jetting Specifications
Keihin FCR-MX Series Off-Road Racing Carburetor
The ultimate for off-road performance. Keihin has developed an FCR carburetor designed for the
specialized needs of the off-road racer. The FCR-MX carburetor has many new features to take
motocross and ATV performance to the next level. These are some of the unique features of the
Keihin FCR-MX for off-road applications:
• Over-flow drain joint and Tube
• Air Cut-Off Valve (ACV) for de-acceleration enrichment
• Hot re-start knob
(only on FCR-MX carburetors listed)
• Throttle Cable enclosure
• Float chamber baffle for rough terrain
• High capacity float chamber
• Quad Vents
FCR-MX Sizing Guide
Venturi Size
Engine Size
37mm
250cc - 375cc
39mm
350cc - 500cc
41mm
450cc and larger
Keihin FCR-MX Pilot Screw
Stock replacement pilot screw for Keihin FCR-MX carburetors.
Sold each
.
Size
Order No.
50mm
021-729
40mm
021-800
Individual Parts (each)
Order No.
Spring
021-041
Washer
021-045
O-Ring
021-043
Sudco FCR-MX Carburetor Rebuild Kits
Genuine KEIHIN replacement parts. Sold in kits.
Application
Order No.
FCR-MX
020-318
FCR-MX37, 39, 41 FCR-MX
020-319
FCR-MX37, 39, 41 with Air Cut-Off Valve/Hot Start
020-320
FCR-MX37, 39, 41 with Air Cut-Off Valve/Hot Start/TPS
020-321
FCR-MX Carburetors