MXA’S SECRET JETTING SPECS, 2003 And Back

We can’t tell you how to jet your bike. It’s a big world out there (and we don’t know you all that well). However, we can tell you what jetting we run in the MXA test fleet. Take into account that we race in a Mediterranean climate, near sea level, within sight of palm trees and never far from a Double Latte. We also run fresh 92-octane gas, work on our bikes every week, clean the filters, change pistons and rings regularly, are alert to pinging and haven’t changed oil brands in over a decade.

This is the brass we run in ’03-
’02- ’01 (and ran in ’00-’99-’98-’98-’97)

2003 JETTING SPECS

2003 HONDA CR85

Main…122
Pilot…52
Needle…stock
Clip…stock
Air screw..1 1/2 turns

2003 HONDA CR125

Main…stock
Pilot…40
Needle…6DGY22-71
Clip…1st
Air screw..1 1/4 turns

2003 HONDA CR250

Main…400
Pilot…40
Needle…6BHY38-70
Clip…1st
Air screw…stock

2003 HONDA CRF450

Main…stock
Pilot…stock
Needle…stock
Clip…stock
Fuel screw…stock

2003 KAWASAKI KX65

Main…stock
Pilot…48
Needle…stock
Clip…stock
Air screw…stock

2003 KAWASAKI KX85

Main…stock
Pilot…48
Needle…stock
Clip…stock
Air screw…stock

2003 KAWASAKI KX125

Main…410
Pilot…37.5
Needle…stock
Clip…2nd
Air screw…stock

2003 KAWASAKI KX250

Main…stock
Pilot…stock
Needle…stock
Clip…stock
Air screw…1 1/2 turns

2003 KTM 65SX

Main…210
Pilot…stock
Needle…stock
Clip…4th
Air screw…1 1/2 turns

2003 KTM 125SX

Main…190
Pilot…45
Needle…1469G
Clip…2nd
Air screw…1 1/2 turns

2003 KTM 200SX

Main…stock
Pilot…stock
Needle…stock
Clip…2nd
Air screw…1 1/2 turns

2003 KTM 250SX

Main…175
Pilot…48
Needle…stock
Clip…stock
Air screw…1 1/2 turns

2003 KTM 450SX

Main…stock
Pilot…42
Needle…stock
Clip…stock
Fuel screw…1 1/2 turns

2003 KTM 525SX

Main…stock
Pilot…45
Needle…stock
Clip…stock
Fuel screw…1 1/2 turns

2003 SUZUKI RM85

Main…122
Pilot…48
Needle…stock
Clip…2nd
Air screw…2 turns

2003 SUZUKI RM125

Main…440
Pilot…37.5
Needle…stock
Clip…2nd
Air screw…1 1/2 turns

2003 SUZUKI RM250

Main…165
Pilot…45
Needle…stock
Clip…2nd
Air screw…1 1/2 turns
Slide…7.0

2003 YAMAHA YZ85

Main…stock
Pilot…stock
Needle…stock
Clip…stock
Air screw…2 3/8 turns

2003 YAMAHA YZ125

Main…stock
Pilot…stock
Needle…stock
Clip…stock
Air screw…2 turns

2003 YAMAHA YZ250

Main…stock
Pilot…stock
Needle….stock
Clip…stock
Air screw…1 turn

2002 JETTING SPECS

2002 HONDA CR125

Mainjet…stock
Pilot jet…30
Needle…stock
Clip…3rd
Air screw…1 1/2 turns

2002 HONDA CR250

Mainjet…400
Pilot jet…35
Needle…H1-72
Clip…stock
Air screw…1 turn

2002 KAWASAKI KX125

Mainjet…stock
Pilot jet…stock
Needle…stock
Clip…2nd
Air screw…1 1/2 turns

2002 KAWASAKI KX250

Mainjet…172
Pilot jet…stock
Needle…N3WE
Clip…2nd
Air screw…1 turn

2002 YAMAHA YZ125

Mainjet…400
Pilot jet…30
Needle…6BHY24-77
Clip…1st
Air screw…2 turns

2002 YAMAHA YZ250

Mainjet…stock
Pilot jet…stock
Needle…stock
Clip…5th
Air screw…1 turn

2002 KTM 125SX

Mainjet…stock
Pilot jet…stock
Needle…stock
Clip…1st
Air screw…1 1/2

2002 KTM 250SX

Mainjet…175
Pilot jet…stock
Needle…stock
Clip…2nd
Air screw…1 1/2

2002 SUZUKI RM125

Mainjet…stock
Pilot jet…27.5
Needle…stock
Clip…5th
Air screw…2 turns

2002 SUZUKI RM250

Mainjet…stock
Pilot jet…45
Needle…stock
Clip…4th
Air screw…1 1/2 turns

MXA’S 2001 JETTING SPECS

2001 YZ125 JETTING
Jet…Stock….Reccomended
Mainjet…. 460…stock
Pilot jet… 25 …stock
Needle… 6B6KU9-75…stock
Clip… 3rd…2nd
Air screw… 3/4 turn…1
Slide… 5.0…6.0

2001 YZ250 JETTING
Jet….Stock….Reccomended
Mainjet… 178…stock
Pilot jet… 50…stock
Needle… N3EJ…stock
Clip… 2nd…stock
Air screw… 1 turn…1.125
Slide… 7.0 …stock

2001 KX125 JETTING
Jet….Stock….Reccomended
Mainjet… 360…370
Pilot jet… 50…45
Needle… 6BEF16-69
Clip… 4th….3rd
Air screw… 2 turns….1.5
Slide… 5.5…stock

2001 KX250 JETTING
Jet….Stock….Reccomended
Mainjet… 160…stock
Pilot jet… 52….55
Power Jet… 48 …stock
Needle… NAFF…NALG
Clip… 2nd…stock
Air screw… 2 turns…stock
Slide… 8.0…stock

2001 125SX JETTING
Jet….Stock….Reccomended
Mainjet… 185….182
Pilot jet… 48 …stock
Needle… 1469D…stock
Clip… 3rd….2nd
Air screw… 1.50 turns…1.75
Slide… 5.5…6.0

2001 KTM 250SX.
Jet….Stock….Reccomended
Mainjet… 172…stock
Pilot jet… 48…stock
Needle… NOZE…stock
Clip… 3rd…stock
Air screw…1.5 turns…stock
Slide… 7.0…stock

2001 CR125 JETTING
Jet….Stock….Reccomended
Mainjet… 380…stock
Pilot jet… 45…stock
Needle… 6BEG20-68…6BEG21-69
Clip… 3rd…1st
Air screw… 2.25 turns…1.5
Slide… 5.0…4.5

2001 CR250 JETTING
Jet….Stock….Reccomended
Mainjet… 420…430
Pilot jet… 35…30
Needle… 6BEH1-73…6BEH2-75
Clip… 3rd…2nd
Air screw… 1.5 turns…1.75
Slide… 4.0….5.0

2001 RM125 JETTING
Jet….Stock….Reccomended
Mainjet… 460…stock
Pilot jet… 27.5…25
Needle… 6BGY23-75…stock
Clip… 3rd…stock
Air screw… 1.5 turns…stock
Slide… 5.75….stock

2001 RM250 JETTING
Jet….Stock….Reccomended
Mainjet… 162…stock
Pilot jet… 48…stock
Power jet…45…50
Needle… N3WK…stock
Clip… 3rd…2nd
Air screw… 1.5 turns…stock
Slide… 7.0….stock

MXA’S 2000 JETTING SPECS

2000 HONDA CR125
Jet…Stock…Recommended
MAIN…360…stock
PILOT…50…stock
NEEDLE…6BEG20-69…6BEG21-70
CLIP…2nd…stock
AIR SCREW…1.125 turns…stock

2000 HONDA CR250
Jet…Stock…Recommended
MAIN…180…175
PILOT…48…52
NEEDLE…715-289…stock
CLIP…3rd…2nd
AIR SCREW…1.5 turns…stock

2000 KAWASAKI KX125
Jet…Stock…Recommended
MAIN…160…stock
PILOT…45…stock
POWERJET…55…42
NEEDLE…N7NW…stock
CLIP…3rd…2nd
AIR SCREW…2 turns…stock

2000 KAWASAKI KX250
Jet…Stock…Recommended
MAIN…160…stock
PILOT…52…stock
POWERJET…48…stock
NEEDLE…N3WE…stock
CLIP…3rd…stock
AIR SCREW…2 turns…stock

2000 KTM 125SX
Jet…Stock…Recommended
MAIN…190…stock
PILOT…48…stock
NEEDLE…1467D…stock
CLIP…2nd…stock
AIR SCREW…1.5 turns…stock

2000 KTM 250SX
Jet…Stock…Recommended
MAIN…172…stock
PILOT…48…stock
NEEDLE…NOZE…NOZF
CLIP…4th…3rd
AIR SCREW…1.5 turns…stock

2000 SUZUKI RM125
Jet…Stock…Recommended
MAIN…175…172
PILOT…50…stock
NEEDLE…1469M…stock
CLIP…4th…stock
AIR SCREW…1.5 turns…2

2000 SUZUKI RM250
Jet…Stock…Recommended
MAIN…158…stock
PILOT…42…stock
POWERJET…55…stock
NEEDLE…N3WK…stock
CLIP…3rd…2nd
AIR SCREW…1.5 turns…stock

2000 YAMAHA YZ125
Jet…Stock…Recommended
MAIN…350…stock
PILOT…35…stock
NEEDLE…6DHY53-75…stock
CLIP…3rd…2nd
AIR SCREW…1.5 turns…2

2000 YAMAHA YZ250
Jet…Stock…Recommended
MAIN…175…stock
PILOT…50…stock
POWERJET…55…stock
NEEDLE…N3CW…stock
CLIP…3rd…stock
AIR SCREW…1 turns…1.5

MXA’S 1999 JETTING SPECS

1999 HONDA CR125
Jet…Stock…Recommended
MAIN…175…stock
PILOT…55…stock
NEEDLE…1368M…1369L
CLIP…3rd…1st
AIR SCREW…2.5 turns…2

1999 HONDA CR250
Jet…Stock…Recommended
MAIN…190…188
PILOT…42…45
NEEDLE…1370D…1369D
CLIP…3rd…1st
AIR SCREW…2 turns…2.5

1999 KAWASAKI KX125
Jet…Stock…Recommended
MAIN…158…stock
PILOT…45…stock
NEEDLE…N7PW…N7NW
CLIP…3rd…stock
AIR SCREW…1.5 turns…stock

1999 KAWASAKI KX250
Jet…Stock…Recommended
MAIN…158…stock
PILOT…45…stock
NEEDLE…N3YK…N3WK
CLIP…3rd…stock
AIR SCREW…1.5 turns…1.25

1999 KTM 125SX
Jet…Stock…Recommended
MAIN…190…185
PILOT…48…45
NEEDLE…NOZH…stock
CLIP…3rd…2nd
AIR SCREW…1.5 turns…stock

1999 KTM 250SX
Jet…Stock…Recommended
MAIN…175…168
PILOT…45…stock
NEEDLE…NOZG…NOZH
CLIP…3rd…2nd
AIR SCREW…1.5 turns…stock

1999 SUZUKI RM125
Jet…Stock…Recommended
MAIN…175…168
PILOT…55…stock
NEEDLE…1470M…stock
CLIP…4th…3rd
AIR SCREW…1.5 turns…2

1999 SUZUKI RM250
Jet…Stock…Recommended
MAIN…158…152
PILOT…45…42
NEEDLE…N1EG…stock
CLIP…3rd…2nd
AIR SCREW…1.5 turns…stock

1999 YAMAHA YZ125
Jet…Stock…Recommended
MAIN…350…stock
PILOT…45…stock
NEEDLE…6DHY53…stock
CLIP…2th…3rd
AIR SCREW…1.5 turns…2

1999 YAMAHA YZ250
Jet…Stock…Recommended
MAIN…172…stock
PILOT…48…stock
NEEDLE…N3VF…stock
CLIP…2nd…stock
AIR SCREW…1 turns…1.25

MXA’S 1998 JETTING SPECS

1998 HONDA CR125
Jet…Stock…Recommended
MAIN…172…165
PILOT…52…stock
NEEDLE…1368…1470
CLIP…3rd…2nd
AIR SCREW…1.75 turns…1.5

1998 HONDA CR250
Jet…Stock…Recommended
MAIN…175…stock
PILOT…55…52
NEEDLE…1368M…1368L
CLIP…3rd…2nd
AIR SCREW…1.5 turns…2

1998 KAWASAKI KX125
Jet…Stock…Recommended
MAIN…160…158
PILOT…45…42
NEEDLE…1469…stock
CLIP…4th…2nd
AIR SCREW…1.5 turns…stock

1998 KAWASAKI KX250
Jet…Stock…Recommended
MAIN…158…160
PILOT…45…stock
NEEDLE…NOZG…stock
CLIP…3rd…2nd
AIR SCREW…1.5 turns…stock

1998 KTM 125SX
Jet…Stock…Recommended
MAIN…190…182
PILOT…48…45
NEEDLE…NOZH…stock
CLIP…4th…2nd
AIR SCREW…1.5 turns…stock

1998 KTM 250SX
Jet…Stock…Recommended
MAIN…175…178
PILOT…45…stock
NEEDLE…N85C…NOZG
CLIP…3rd…2nd
AIR SCREW…1.5 turns…stock

1998 SUZUKI RM125
Jet…Stock…Recommended
MAIN…175…168
PILOT…55…58
NEEDLE…1470…1468
CLIP…4th…3rd
AIR SCREW…1 turn…stock

1998 SUZUKI RM250
Jet…Stock…Recommended
MAIN…162…160
PILOT…45…stock
NEEDLE…N1EI…stock
CLIP…3rd…stock
AIR SCREW…1.5 turns…stock

1998 YAMAHA YZ125
Jet…Stock…Recommended
MAIN…350…stock
PILOT…45…stock
NEEDLE…6BEF16-69…stock
CLIP…4th…2nd
AIR SCREW…2 turns…1.5

1998 YAMAHA YZ250
Jet…Stock…Recommended
MAIN…172…170
PILOT…48…stock
NEEDLE…N3VF…stock
CLIP…2nd…stock
AIR SCREW…2 turns…1.5

MXA’S 1997 JETTING SPECS

1997 HONDA CR125
Jet…Stock…Recommended
MAIN…172…170
PILOT…50…55k
NEEDLE…1368M…1369M
CLIP…3rd…stock
AIR SCREW…1.75 turns…stock

1997 HONDA CR250
Jet…Stock…Recommended
MAIN…175…stock
PILOT…55…52
NEEDLE…1369M…1367L
CLIP….3rd…stock
AIR SCREW…1.75 turns…stock

1997 YAMAHA YZ125
Jet…Stock…Recommended
MAIN…350…stock
PILOT…50…45
NEEDLE…6BEG9-69…6BEG9-70
CLIP…2nd
AIR SCREW…1-1/2 turns

1997 Yamaha YZ250
Jet…Stock…Recommended
MAIN…170…stock
PILOT…48…stock
NEEDLE…N4DG…stock
CLIP…3rd
AIR SCREW…1-3/4 turns

1997 SUZUKI RM125
Jet…Stock…Recommended
MAIN…175…170
PILOT…50…stock
NEEDLE…1469…stock
CLIP…4th
AIR SCREW…1-1/2 turns

1997 SUZUKI RM250
Jet…Stock…Recommended
MAIN…175…165
PILOT…48…45
NEEDLE…NIED…NOZG
CLIP…3rd
AIR SCREW…1-1/4 turns

1997 KAWASAKI KX125
Jet…Stock…Recommended
MAIN…160…158
PILOT…40…38
NEEDLE…N2EJ…N1AJ or N1AK
CLIP…3rd
AIR SCREW…1-1/2 turns

1997 KAWASAKI KX250
Jet…Stock…Recommended
MAIN…165…stock
PILOT…45…stock
NEEDLE…N3WF…stock
CLIP…3rd
AIR SCREW…1-1/2 turns

1997 KTM 250SX
Jet…Stock…Recommended
MAIN…175…stock
PILOT…45…stock
NEEDLE…N85C…stock
CLIP…3rd…2nd
AIR SCREW…1-1/2 turns