Sudco Vol 38

atercraft

ools

hemical

lectrical

ontrol

uspension

ngine

ntake

intage

202

ORDER: 800-998-3529

TECH: 310-637-8330

Jet Needle #4 Series

Competition Racing

Overall

Leaner

#4D8

#4P3

#4DH7

#4D8

#4DG6

#4D3

#4P3

#4F10

#4DG6

#4D3

#4DG6

#4DH7

#4F6

#4F10

#4DH7

#4F6

#4F15

#4E14

#4E1

#4J13

#4L13

#4L6

#4J11

#4J13

#4L13

#4J13

#4J11

Richer

#4L11

#4L6

Jet Needle #5 Series (A)

Competition Racing

Overall

Leaner

#5D6

#5C4

#5D120

#5D6

#5C4

#5D5

#5EJ13

#5D120

#5J9

#5D1

#5F18

#5D1

#5DP7

#5F16

#5EJ13

#5FL14

#5FJ9

#5F3

#5EH7

#5EJ13

#5FJ9

#5FL

#5EH7

#5DP

#5D5

#5DH21

#5FL14

#5E13

#5FL14

#5FL7

#5L1

#5FL7

#5E13

#5J6

#5E13

#5F16

#5D1

#5DP7

#5DH21

#5F9

#5J9

#5F16

#5J6

#5DH21

#5L1

Richer

#5F12

Jet Needle #5 Series (B)

Competition Racing

Overall

Leaner

#5EP8

#5DP2

#5EJ11

#5DL13

#5EL9

#5EJ11

#5EL9

#5EJ11

#514

#5EP8

#5DL13

#5FL11

Richer

#5DP2

#514

Note:

The following listing of needles are simply the average

performance of a needle between 1/4 and 3/4 throttle opening.

Needles are constructed such that a given point on a needle,

(for example, at 3/4 throttle opening), the needle may be found

to perform richer at this given point when compared to the same

given point on another needle, but according the the average

performance chart, the needle should perform leaner.

For example:

Average Performance Chart

Richer

D-5 (A)

, the taper diameter is

1.915

, at

D-5 (b)

, the taper is

2.040

; the taper diameter at

D-5 (A)

is smaller than

D-5 (B)

At this given point of throttle opening

(3/4)

, needle

#6DH4

will

run slightly richer than

#6FJ6

, but the average performance will

still be that

#6DH4

will be a leaner needle because it will perform

leaner at more given points than a

#6FJ6.

Consequently, if you

are concentrating on a specific throttle opening for competition

use, be certain to check the taper diameter at that point of

throttle opening.

For a more detailed and comprehensive explanation of the

various needles as to their taper diameters at given points,

see

NEEDLE TAPER DIAMETER DIMENSION CHARTS.

THE QUICK REFERENCE CHART FOR NEEDLE SELECTION

was prepared by measuring the needles as to their diameter at

given points. Given points are 10mm apart from each other.

By computing the different measurements and arranging them

in order of taper thickness or thinness, three categories for

application of needles were determined.

Category l - Competition.

For example, motocross racing and desert racing where mid-

range throttle operation is vital.

Category ll - Racing.

For example, Road racing, where 3/4 to full throttle

operation is vital.

Category lll - Overall.

For example, Street riding,

where the full range of throttle operation is required.

Quick Reference Chart for Needle Selection

(average Performance Chart)

Jet Needles

Leaner