SECTION 05 - ENGINE PREPARATION
MMC2005-001_05A.FM
05-21
1. E-ring
2. Needle jet
3. Fuel
4. Air
5. Metered here
6. Jet needle
7. Throttle valve
The jet needle raises and lowers with the throttle
valve which changes jet needle position in the
needle jet. Because the jet needle is tapered from
top to bottom, an increasing amount of fuel is de-
livered through the needle jet whenever the throt-
tle valve is raised. Increased or decreased air flow,
by the throttle valve position, regulates the amount
of fuel through the needle jet and around the jet
needle.
The jet needle works on combination of length,
taper, and E-ring position. Each jet needle has a
number and letter series stamped on the body.
Example: 6DH7
6 - Basic length of needle.
DH - A single letter would indicate a single taper
of the needle, double letter a double taper,
and three letters mean there is a triple taper.
D -
Amount of taper at top of needle.
H -
Amount of taper at bottom of needle.
7 -
Material, type of coating and start of second
taper on needle.
NOTE:
Letter designation of the jet needle indi-
cates the angle of taper. Each letter (starting with
A is 0.25° greater than preceding letter. Example:
D = 1°, E = 1-1/4°, F = 1-1/2°, G = 1-3/4°, and
H = 2°. This applies to both single and double taper
needles.
At the top of the jet needle are five grooves num-
bered 1 through 5 from top to bottom. The number
3 or middle groove being the starting point for the
E-ring. The E-ring position on any jet needle deter-
mines the rich or lean part throttle or mid-range
carburetor operation.
Moving E-ring to position 1 or 2 lowers jet needle
into needle jet and leans out the fuel/air mixture.
Similarly, moving E-ring to position 4 or 5 raises jet
needle in needle jet and enriches the fuel/air mix-
ture.
A01C2XA
7
6
5
4
3
2
1
LEAN
A01C2ZA
RICH
6
D
H
4
5
Number
stamped
here
7
1
3
2
Содержание ski-doo MACH Z 1000 SDI
Страница 1: ...Mmc 2005 001 Racing FH8 Wed Sep 15 15 27 01 2004 Page 1 C M Y CM MY CY CMY K...
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Страница 196: ...05 72 MMC2005 001_05A FM SECTION 05 ENGINE PREPARATION FUEL TANK AND FUEL PUMP All Models except SDI 2 4 3 1 A33C2VS...
Страница 289: ...SECTION 06 DRIVE SYSTEM MMC2005 001_06A FM 06 27 422 A01D3JA 417 222 562 427 A01D3KA 417 222 677...
Страница 473: ...SECTION 12 SERVICE TOOLS MMC2005 001_12A FM 12 29 N Scratch remover P N 861 774 800 APPLICATION All models...
Страница 476: ...MMC2005 001_13A FM 13 1 SECTION 13 ACCESSORIES TABLE OF CONTENTS 0 ACCESSORIES 13 02...
Страница 493: ...Mmc 2005 001 Racing FH8 Wed Sep 15 15 27 01 2004 Page 1 C M Y CM MY CY CMY K...