Sudco Vol 38

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Jet Needles
The Jet Needle controls the fuel mixture in the mid-range (1/4-3/4)
throttle position. The taper of the needle determines the amount
of fuel. For example, the thinner the diameter of the needle, the more
fuel will be drawn. The thicker the diameter of the needle, the less fuel
will be drawn.
Needle Taper Diameter Dimension Chart
D-1 through D-5 indicates diameter (mm) at each point.
A B D-1 D-2 D-3 D-4 D-5
#4E1 50.3 28.0 2.515 2.515 2.345 2.127 1.924
#4DH7 50.3 23.0 2.518 2.518 2.386 2.098 1.790
#4J13 50.2 24.0 2.513 2.513 2.230 1.800 1.40
#4L6 50.3 24.5 2.515 2.515 2.178 1.660 1.190
#4J11 41.5 21.3 2.512 2.506 2.188 1.776
D-1 through D-6 indicates diameter (mm) at each point.
A B D-1 D-2 D-3 D-4 D-5 D-6
#5F3 58.0 27.4 2.519 2.519 2.419 2.135 1.863
#5EJ11 60.3 28.5 2.515 2.515 2.515 2.241 1.839 1.420
#5FL11 60.3 28.2 2.518 2.518 2.438 2.175 1.740 1.256
#5FL14 58.0 28.0 2.520 1.520 2.440 2.170 1.735
#5FL7 58.0 28.0 2.518 2.518 2.440 2.170 2.170 1.735
#5DP7 57.6 26.4 2.512 2.512 2.440 2.259 1.580
#5J6 58.0 27.5 2.518 2.518 2.340 1.890 1.450
#5L1 58.0 27.0 2.518 2.518 2.330 1.811 1.297
#5J9 58.0 27.0 2.522 2.520 1.432 1.996 1.505
D-1 through D-6 indicates diameter (mm) at each point.
A B C D-1 D-2 D-3 D-4 D-5 D-6
#6F5 62.3 38.1 19.0 2.515 2.456 2.454 2.364 2.098 1.840
#6F4 62.3 32.0 19.4 2.515 2.442 2.436 2.206 1.939 1.678
#6F8 62.3 34.0 21.5 2.512 2.512 2.386 2.214 1.945 1.688
#6F16 64.6 31.2 18.4 2.520 2.404 2.400 2.201 1.941 1.679
Needle Taper Diameter Dimension Chart
(a)=Needle Length (mm)
(b)=Length between points (x) and the taper point (Y) 1=10mm
2=20mm
3=30mm
4=40mm
5=50mm
D-1, -2, -3, -4, -6 are the actual taper diameters at those given
points in millimeters
D-1 through D-6 indicates diameter (mm) at each point.
A B D-1 D-2 D-3 D-4 D-5 D-6
#6DH2 62.3 28.0 2.511 2.511 2.466 2.295 2.000 1.660
#6F9 62.3 28.9 2.516 2.516 2.475 2.210 1.949 1.678
#6CF1 61.5 29.5 2.512 2.512 2.429 2.240 1.974 1.710
#6FJ6 62.3 35.2 2.505 2.505 2.505 2.376 2.040 1.606
#6DH3 62.3 22.0 2.512 2.512 2.458 2.286 1.948 1.607
#6L1 62.3 37.0 2.512 2.512 2.512 2.335 1.826 1.313
#6DP17 62.3 32.1 2.518 2.518 2.518 2.372 1.834 1.141
#6N1 62.3 37.0 2.514 2.514 2.514 2.278 1.672 1.058
#6DP1 62.3 28.9 2.511 2.511 2.476 2.312 1.748 1.075
#6DH4 62.3 25.5 2.520 2.520 2.440 2.258 1.915 1.575
#6DH7 62.2 28.5 2.516 2.516 2.505 2.316 2.009 1.688
#6DH8 62.2 20.3 2.538 2.538 2.436 2.208 1.827 1.497
#6FL14 62.1 26.7 2.538 2.538 2.538 2.233 1.649 1.218
#6F15 62.2 19.8 2.535 2.538 2.461 2.208 1.979 1.649
#6DP10 62.4 26.5 2.51 2.51 2.44 2.26 1.56 0.89
#6F13 64.2 32.8 2.50 2.46 2.46 2.24 1.97 1.70
#6DL30 64.7 26.3 2.51 2.51 2.45 2.09 1.66 1.24
D-1 through D-7 indicates diameter (mm) at each point.
A B D-1 D-2 D-3 D-4 D-5 D-6 D-7
#7DH5 72.2 27.4 2.98 2.98 2.94 2.78 2.4 2.08 1.72
#7F7 72.3 33.1 2.99 2.99 2.99 2.80 2.54 2.28 2.02
#7F6 72.3 29.0 3.00 3.00 2.95 2.68 2.41 2.14 1.87
#7DH3 72.5 28.1 2.98 2.98 2.96 2.80 2.47 2.11 1.76
#7DH2 75.3 31.6 2.99 2.99 2.99 2.84 2.66 2.27 1.92
#4 All VM18 Carburetors,VM20
VM22, VM24
#5 VM26 - VM32 Spigot
VM28 - VM34 Flange
TM24, TM32, TM34
#6 VM30 - VM38 Spigot
#7 VM40 - VM44 Spigot
#8 HSR42, HSR45, HSR48
#9 RS34 - RS40 Smoothbore,
TM36, TM40 (HS40) Pumper Carb
#Series Type Application
10
20
30
40
50
60
70
A B
x b y
a
D-1 D-2 D-3 D-4 D-5 D-6 D-7
4
3
5
2
1
a
b x y
A B
D-1 D-2 D-3 D-4 D-5
Jet Needles
V
intage
i
ntake
e
ngine
s
uspension
c
ontrol
e
lectrical
c
hemical
t
ools
W
atercraft
203
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