Carburetor Jetting
Clutching Chart
AMBIENT
TEMPERA-
TURE
Below
-20
°
F
Below
-29
°
C
-20
°
F to
+
10
°
-29
°
C to
-12
°
C
+
10
°
F -
+
40
°
F
-12
°
C -
+
5
°
C
Above
+
40
°
F
Above
+
5
°
C
Altitude
Meters
(Feet)
Shift
Weight
Drive
Clutch
Spring
Driven
Clutch
Spring
Driven
Helix
Chain-
case
Gearing
0-900
(0-3000)
390
370
340
320
0-900
0-3000
S53H
Almond
Red
#2
Blue /
R49
22:43
74P
Alti-
(0 3000)
0-3000
Red
Blue /
Orange
74P
Alti-
tude
Me-
900-1800
(3000-6000)
350
330
310
290
900-1800
(3000-6000)
S51H
Almond
Red
#3
Blue /
R49
22:43
74P
Me-
ters
(Feet)
(3000-6000)
(3000-6000)
Red
Blue /
Orange
74P
(Feet)
1800-2700
(6000-9000)
320
300
280
260
1800-2700
(6000-9000)
S49H
Almond
Red
#3
Blue /
Orange
R49
22:43
74P
2700-3700
(9000-12000)
280
270
250
230
2700-3700
(9000-12000)
S49H
Almond
Red
#3
Blue /
Orange
R49
22:43
74P
#3 jet needle position for all
Production = 350 main jet for 0
_
F at 0-1000 feet with 92 octane non-ethanol fuel, the key switch in the 92 octane
position, and the timing curve position “D”.
TIMING INFORMATION
The PRO X 440 has been equipped with two switches that will change the timing curve.
The first switch is an ignition switch located on the console.
This switch is used to match the timing curve to the type of
fuel you are using. The fuel types are 92 octane non-ethanol
premium fuel and 110 octane fuel. Do not run the machine in
the wrong ingnition key position or engine damage will oc-
cur.
The second switch is located on the airbox and has seven optional curves. These seven options are used to match the fuel
type and the racing conditions which may vary, depending on the race. The standard position is “D” and should not be moved
unless you are a knowledgeable engine tuner.
Position
Timing Effect
A
+3
B
+2
C
+1
D (Standard Position)
0
E
--2
F
--3
G
--4
The exhaust system has a temperature sensor in the body of the pipe that effects the timing curve as the temperature
changes. This feature helps the pipe tune quickly and is not adjustable.
This engine is jetted for operation at 0 degrees and warmer. Re-jetting is required for temperatures colder than 0
_
F.
CAUTION
CAUTION
Mis-use of the timing se-
lector switch can cause
serious engine damage.
Running the machine in
the wrong ignition key
position will cause engine
damage.
OFF
ON
110 OCT.
ON
92 OCT.
Ignition Switch
Positions
Summary of Contents for 2001 PRO X 440
Page 4: ......
