4.6
FUEL SYSTEM / CARBURETION
CARBURETOR SPECIFICATIONS
CARBURETOR JETTING
IMPORTANT: The following guidelines must be followed
when establishing a main jet setting:
1. Select the lowest anticipated temperature and altitude
at which the machine will be operated.
2. Select the correct main jet according to the engines
fuel/performance requirements.
MIKUNI JET PART NUMBERS
Main Jets - BST 34 Pilot Jets - BST 34
Jet Number
Part Number Jet Number Part Number
130 3130561 25 n/a
132.5 3130562 27.5 n/a
135 3130563 30 n/a
137.5 3130564 32.5 n/a
140 3130527 35 n/a
142.5 3130566 37.5 n/a
145 3130567 40 3130624
147.5 3130568 42.5 3130526
152.5 3130570 45 3131397
155 3130571 47.7 3131226
157.5 3130572 50 3131132
160 3131141 55 n/a
162.5 3131142 57.5 n/a
165 3131143 60 n/a
167.5 3131144 65 n/a
170 3131145 70 n/a
CV CARBURETOR SYSTEM FUNCTION
2006 Hawkeye 2x4 / 4x4
(Domestic and International)
Ambient
Temperature
Below 40F
(Below 5C)
Above 40F
(Above 5C)
Altitude
Feet
(Meters)
0-6000
(0-1800)
152.5 147.5
6000-12000
(1800-3700)
147.5 142.5
CAUTION
A main jet that is too small will cause a lean operat-
ing condition resulting in serious engine damage.
Select the correct main jet carefully for elevation
and temperature according to the charts in the
Specifications section or in the Owner’s Safety and
Maintenance Manual for each particular model.
Carburetor Component Function
System
Main
Components
Main
Function
Main
Affect
Float
System
(Level
Control)
Inlet Pipe,
Needle and
Seat, Float,
Float Pin
Maintains
specified fuel
level in float
chamber
(carburetor float
bowl)
All systems
All throttle
ranges
Venting Passages in
Carburetor, Vent
lines
to frame
Supplies
atmospheric
pressure to float
chamber
All systems
All throttle
ranges
Starter
(Choke/
Enrichment)
Choke Lever,
Cable, Plunger,
Return Spring,
Carb Passages
(Starter Jet,
Starter Bleed
Pipe)
Supplies
additional fuel
air mixture
necessary for
cold starting
All throttle
ranges
Greatest
effect at low
throttle
settings and
idle
Pilot (Idle
System)
Pilot Jet/
Passage-ways,
Pilot–Mixture
Screw with
Spring Washer
and Sealing O–
Ring, By-pass
Ports (Behind
Throttle Plate),
Pilot Air Jet,
Pilot Outlet,
Throttle Plate
Primarily
supplies fuel at
idle and low
throttle
positions
Mainly idle
to 1/4
throttle
Minimal
effect after
1/2 throttle
Main
System
Main Jet, Main
Air Jet, Main Air
Passage,
Needle Jet, Jet
Needle, Vacuum
Slide, Throttle
Plate
Supplies fuel at
mid–range and
high throttle
settings.
1/4 to full
throttle
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