Identify that jet
Using this page means you are a VERY intelligent person who measures before ordering. We only sell brand new, never used jets and cannot take returns on jets to prevent people from getting used or drilled out jets. Confirm dimensions before ordering, if the dimensions don't match don't order.
Dellorto
Dynojet
Keihin
Mikuni
Hitachi
Teikei
S&S
First identify the carb manufacturer, mikuni, keihin, hitachi, holley.
Second the jets need to be located. The jets are under the float bowl cover. The float bowl cover is held in place by 4 screws - on most carburetors. Below are 2 different carbs, one has parts circled in yellow and another carb has parts circled in orange.
PHOTO 1 Remove the float bowl cover screws. |
PHOTO 2 Jets circled above, they are normally a brass color. In this carb the slow jet is recessed and not visible. |
PHOTO 3 A different carb is shown in photo 2A. It has 3 jets and a mixture screw which are circled in orange. |
Sometimes jets are located elsewhere in the carb, but the ones above are most common.
| PHOTO 4 The long piece below is not the main jet  |
PHOTO 5 Unscrew and the main jet is on the left. Note jets may be round or hex shape.  |
Look on the jets for a number (which is the size of the jet) and the manufacturer ID stamp.
| GENUINE MIKUNI jets will have a stamping
on them which is a "square within a square" on them:  |
GENUINE KEIHIN jets will have a "K star" stamping on them: |
Below are different types of jets, look for one that is similar and check measurements to verify it is your jet. Many of the jets are similar so be sure to check entire list.
OVERALL LENGTH = 8.0 mm
HEAD DIAMETER = 7.0 mm
THREAD DIAMETER = 4.8 mm
Dellorto M5
OVERALL LENGTH = 8.0 mm
HEAD DIAMETER = 8.0 mm
THREAD DIAMETER = 5.8 mm
Dellorto M6
OVERALL LENGTH = 9mm
HEAD DIAMETER = 8mm
THREAD DIAMETER = 9.9mm
KEIHIN 1001-806
OVERALL LENGTH = 8.0 mm
SHAFT DIAMETER = 6.8 mm
THREAD DIAMETER = 7.9 mm
KEIHIN main 3D
OVERALL LENGTH = 8.5 mm
SHAFT DIAMETER = 5.5 mm
DIAMETER OF THREAD = 6.9 mm
KEIHIN 99101-124 and 99101-ZF5
OVERALL LENGTH = 8.5 mm
SHAFT DIAMETER = 4.8 mm
DIAMETER OF THREAD = 5.9 mm
KEIHIN 99101-187 3C
OVERALL LENGTH = 8.5mm
DIAMETER OF THREAD = 3.9mm
KEIHIN Leak jet N424-52
OVERALL LENGTH = 7.6 mm
SHAFT DIAMETER = 3.2 mm
THREAD DIAMETER = 4.4 mm
99164-601 or_3A
OVERALL LENGTH = 16.5mm
THREAD DIAMETER = 4.9mm
KEIHIN 99101-357 or KH25
OVERALL LENGTH = 22mm
THREAD DIAMETER = 4.9mm
N424-14
OVERALL LENGTH = 8mm
HEAD DIAMETER = 7mm
THREAD DIAMETER = 5.9mm
KEIHIN N424-27 or KR39
OVERALL LENGTH = 8mm
HEAD DIAMETER = 6mm
THREAD DIAMETER = 4.9
KEIHIN 99101-393 or KR28
OVERALL LENGTH = 8mm
HEAD DIAMETER = 6mm
THREAD DIAMETER = 4.9mm
KEIHIN N424-36 NICKEL PLATED
OVERALL LENGTH = 7mm
HEAD DIAMETER = 5mm
THREAD MAJOR DIAMETER = 3.9mm
THREAD SPEC = m4 x 0.7
KEIHIN 99101-116 or KR38
OVERALL LENGTH = 7mm
HEAD DIAMETER = 5mm
THREAD DIAMETER = 3.9mm
KEIHIN N424-35 NICKEL PLATED
OVERALL LENGTH = 6.5 mm
HEAD DIAMETER = 4.3 mm
THREAD DIAMETER = 3.4 mm
KEIHIN 1001-108
OVERALL LENGTH = 8.0mm
HEAD DIAMETER = 7.0 mm
THREAD DIAMETER = 5.8 mm
KEIHIN Harley Davidson CV
OVERALL LENGTH = 7 mm
HEAD DIAMETER= 9 mm
THREAD DIAMETER = 7.9mm
99114-292
OVERALL LENGTH = 9.4mm
DIAMETER = 4.95mm
KEIHIN 99201-601
OVERALL LENGTH = 9.6mm
DIAMETER = 6.0mm
KEIHIN 99202-601
OVERALL LENGTH = 28mm
DIAMETER OF THICKEST PART = 5mm
TIP DIAMETER =3mm
KEIHIN 99127-076 or 3L
OVERALL LENGTH = 28mm
THREAD DIAMETER = 5.9mm
HEAD DIAMETER = 4.9mm
KEIHIN N424-21 or K26
OVERALL LENGTH = 23.5mm
THREAD DIAMETER = 5.9mm
HEAD DIAMETER = 4.9mm
KEIHIN N424-26 or K36
OVERALL LENGTH = 28mm
HEAD DIAMETER = 5mm
THREAD DIAMETER = 4.9mm
KEIHIN N424-74C or K27
OVERALL LENGTH = 28mm
DIAMETER OF THICKEST PART = 5mm
THREAD DIAMETER = 4.9mm
KEIHIN 3J
OVERALL LENGTH = 28mm
DIAMETER OF HEAD = 5.5mm
THREAD DIAMETER = 4.4mm
TIP DIAMETER = 3.0mm
KEIHIN N424-22 or 99103-441 or 3R
OVERALL LENGTH = 21mm
DIAMETER = 5mm
N424-32
OVERALL LENGTH = 32mm
THREAD DIAMETER = 3.4mm
HEAD DIAMETER = 5.5mm
TIP DIAMETER = 2.0mm
KEIHIN N424-24 or K29
OVERALL LENGTH = 26.0 mm
HEAD DIAMETER = 4.5 mm
DIAMETER OF THREAD = 3.4 mm
TIP DIAMETER = 2.0 mm
KEIHIN 99103-3G
OVERALL LENGTH = 28mm
HEAD DIAMETER= 5.5mm
THREAD DIAMETER = 3.4mm
TIP DIAMETER = 2.0mm
KEIHIN 99124-076 or 3K
OVERALL LENGTH = 21.5mm
HEAD DIAMETER= 4.2mm
THREAD DIAMETER = 3.4mm
TIP DIAMETER = 2.0mm
KEIHIN 99124-286 or 3E
OVERALL LENGTH = 19mm
HEAD DIAMETER= 4.5mm
THREAD DIAMETER = 3.4mm
TIP DIAMETER = 2.0mm
KEIHIN VINTAGE SLOW 3S
OVERALL LENGTH = 15mm
THREAD DIAMETER = 4.5mm
KEIHIN N424-25B or K35
OVERALL LENGTH = 23mm
THREAD DIAMETER = 4.0mm
TIP DIAMETER = 2.5mm
KEIHIN N424-03 3M
OVERALL LENGTH = 13mm
HEAD DIAMETER = 4.5mm
THREAD DIAMETER = 4.4mm
KEIHIN N424-330 and N424-33 and 3F
OVERALL LENGTH = 21mm
HEAD DIAMETER= 5.5mm
THREAD DIAMETER = 3.4mm
KEIHIN VINTAGE SLOW 2
MIKUNI
OVERALL LENGTH = 11.5mm
THREAD DIAMETER = 5.2mm
THREAD PITCH = 5.25 x 0.9
MIKUNI 4/042 or M20
OVERALL LENGTH = 8mm
DISTANCE ACROSS FLATS = 6mm
THREAD DIAMETER = 5.2mm
MIKUNI M10-14
OVERALL LENGTH = 10.6mm
HEAD DIAMETER = 8mm
THREAD DIAMETER = 5.9mm
THREAD PITCH = 6.0 x 0.8mm
MIKUNI VM11-22
OVERALL LENGTH = 9mm
HEAD DIAMETER = 8mm
THREAD DIAMETER = 4.9mm
THREAD PITCH = 5.0 x 0.7
MIKUNI N100.604 or M21
OVERALL LENGTH = 9mm
HEAD DIAMETER = 6mm
THREAD DIAMETER = 4.9mm
THREAD PITCH = 5.0 x 0.7
MIKUNI N102.221 or M23
OVERALL LENGTH = 6.5 mm
THREAD DIAMETER = 3.9 mm
LARGEST DIAMETER = 4 mm
MIKUNI N100.606
OVERALL LENGTH = 6.5mm
HEAD DIAMETER = 6mm
THREAD DIAMETER = 5.9mm
THEAD SPEC = M6.0 X 1.0
B42/55
OVERALL LENGTH = 9 mm
LARGEST DIAMETER = 6 mm
REQUIRES O-RING 616-12001
MIKUNI N208.099
OVERALL LENGTH = 6.0 mm
THREAD DIAMETER = 4.0 mm
MIKUNI VM17/1002
OVERALL LENGTH = 9.5 mm
THREAD DIAMETER = 3.9 mm
MIKUNI M28/1001 and 3V
OVERALL LENGTH = 7.5mm
THREAD DIAMETER = 3.9mm
MIKUNI BS30-97
OVERALL LENGTH = 16.0 mm
THREAD DIAMETER = 5.9 mm
LARGEST DIAMETER = 6.5 mm
MIKUNI N101.043
OVERALL LENGTH = 14 mm
THREAD DIAMETER = 4.9 mm
6 holes in shaft
MIKUNI BS30/96 or 3N
OVERALL LENGTH = 14 mm
THREAD DIAMETER = 4.9 mm
MIKUNI N151.067 or 3Y
OVERALL LENGTH = 14 mm
THREAD DIAMETER = 4.9 mm
8 holes in shaft
MIKUNI VM22/210 or M22
OVERALL LENGTH = 28mm
HEAD DIAMETER = 5.0mm
THREAD DIAMETER = 3.9mm
THREAD PITCH = 4.0 x 0.7
TIP DIAMETER = 2.5mm
MIKUNI N224.103 or M32
OVERALL LENGTH = 28.0 mm
HEAD DIAMETER = 5.0 mm
THREAD DIAMETER = 3.9mm
THREAD PITCH = 4.0 x 0.7
TIP DIAMETER = 2.0 mm
MIKUNI VM28/486 or M24
OVERALL LENGTH = 28mm
HEAD DIAMETER = 5.0 mm
THREAD DIAMETER = 3.9mm
THREAD PITCH = 4.0 x 0.7
TIP DIAMETER = 2.0mm
MIKUNI VM28-213
OVERALL LENGTH = 8.0 mm
HEAD DIAMETER = 7.5 mm
Hitachi main 3H
Hitachi pilot 3H
OVERALL LENGTH = 8.0 mm
DISTANCE ACROSS FLATS= 7.0 mm
DIAMETER OF THREAD = 4.9 mm
TEIKEI MAIN JET 3T
OVERALL LENGTH = 18.1 mm
DIAMETER OF HEAD= 5.0 mm
DIAMETER OF THREAD = 3.9 mm
TEIKEI SLOW JET 3U
OVERALL LENGTH = 23.6 mm
DIAMETER OF HEAD= 5.0 mm
DIAMETER OF THREAD = 3.9 mm
TEIKEI SLOW JET 3W
S&S
OVERALL LENGTH = 9.0 mm
HEAD DIAMETER = 9.5 mm
DIAMETER OF THREAD = 7.8 mm
S&S main
OVERALL LENGTH = 33.8 mm
HEAD DIAMETER = 6.3 mm
DIAMETER OF THREAD = 7.8 mm
S&S slow / intermediate
Dynojet DJ (tall head)
OVERALL LENGTH = 9.4 mm
HEAD DIAMETER = 6.1 mm
HEAD LENGTH = 4.4 mm
THREAD DIAMETER = 4.7 mm
Dynojet BJ (short head)
OVERALL LENGTH = 8.1 mm
HEAD DIAMETER = 6.1 mm
HEAD LENGTH = 3.1 mm
THREAD DIAMETER = 4.7 mm
Dynojet SJ
OVERALL LENGTH = XXmm
DIAMETER OF THICKEST PART = Xmm
THREAD DIAMETER = XXmm
Dynojet YJ
OVERALL LENGTH = XXmm
DIAMETER OF THICKEST PART = Xmm
THREAD DIAMETER = XXmm