Section 04
ENGINE
Subsection 11
(CARBURETOR AND FUEL PUMP)
MMR2004-120_04_11A.FM
04-11-5
NOTE:
Install needle valve for snowmobile carbu-
retor only. It is designed to operate with a fuel
pump system.
Check throttle slide
no. 5
for wear. Replace as
necessary.
Check idle speed screw
no. 7
for straightness. Re-
place as necessary.
Check for fuel soaked into float
no. 12
;
replace as
necessary.
Check float
no. 12
for cracks or other damages
affecting free movement; replace as necessary.
Inspect throttle cable and housing for any damag-
es. Replace as necessary.
DISASSEMBLY AND ASSEMBLY
NOTE:
To ease the carburetor disassembly and
assembly procedures it is recommended to use
carburetor tool kit (P/N 404 112 000).
2,3, E-Clip and Needle
Remove screws from needle retaining plate to
withdraw the needle.
The position of the needle in the throttle slide is
adjustable by means of an E-clip inserted into 1 of
5 grooves located on the upper part of the needle.
Position 1 (at top) is the leanest, 5 (at bottom) the
richest.
NOTE:
The last digit of the needle identification
number gives the recommended position of the E-
clip
from the top
of the needle.
CLIP POSITIONS
The size of the throttle slide cut-away affects the
fuel mixture between 1/8 to 1/2 throttle opening.
1. Low cut-away low
2. Rich mixture
3. High cut-away high
4. Lean mixture
8, Main Jet
The main jet installed in the carburetor has been
selected for a temperature of - 20°C (0°F) at sea
level. Different jetting can be installed to suit tem-
perature and/or altitude changes. A service bulle-
tin will give information about calibration accord-
ing to altitude and temperature.
A00B2FA
Example
6DH4-3
Needle
identification
Recommended
position.
of the E-clip
from top
A00B2GA
1
2
3
4
5
Lean
Rich
1
3
2
4
A00C01A
Summary of Contents for ski-doo Tundra Scandic 2004 Series
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