Polaris TX Starfire User manual

OWNERS TECHNICAL MANUAL
$3 :50 '

INTRODUCTION
The following pages of this manual cover one of the most
sophisticated high performance snowmobiles on the market
today.
The 1973 TX Starfire snowmobile ---"a finely
tuned, quality performance machine that is backed by a
heritage
of leadership which is unique in the industry."
The 1973 TX Starfire and this manual are the results of the
Polaris
Race Team joining forces with the newly formed
"Polaris Competitive Snowmobile Engineering Department".
This manual covers not only technical and service information
but a certain amount of theory related to the contents enclosed.
All information and specifications are printed to the best of
our knowledge at this time. "Changes and adjustments usually
are required
after meeting our competition and to suit various
track
conditions" so there can and will be some changes to
this manual. To enable us to send this new information to you
it is essential that the tear-out card in the back of this manual
be filled
out in full andmailed to Polaris.
Good luck andsuccessful racing
to all of you.
Competitive Snowmobile
Eng. Dept.
POLARIS
A Textron Company
Roseau, Minnesota 56751

TABLE OF CONTENTS
General Dimensions . . .
Specifications . . . . .
Controls
And Instruments .
Brakes . . . .
Gearing . . . . .
Chaincase Oil Level .
Clutch Alignment
And Center Distance
Steering . . . .
Tracks
And Studding
Track Alignment And Tension
Track Alignment .
Track Removal
Suspension .
Drive Belt . .
Drive Clutch .
Clutch Specifications
Trouble Shooting -Drive Clutch
Driven Clutch . . . . . . .
TX Starflame Engines . . . .
TX Starflame Engine Specifications.
General Engine
Information And Maintenance
TX Starflame Torque Patterns
Twin Cylinder Ignition . . . . . . .
Kokusan-Denki Breakerless Flywheel . .
Trouble
Shooting- Twin Cylinder Ignition
Circuit Checking Of CDI Unit By Tester .
Three Cylinder
Ignition . . . . . . .
Trouble Shooting
Of Three Cylinder Ignition
Circuit Checking Of CDI Unit By Tester
Machine Wiring Diagram . . . .
Mikuni Carburetors And Fuel Pump
Fuel Pump . . . . . . . . .
Carburetors
Keihin Carburetors -Schematic
View .
Service Instructions . . . . . . .
Float Level . . . . . . . . . .
Trouble
Shooting- Keihin RD38 And RD50
Warranty
Safety
.7
.8
.9
10. 11
12- 13
14
15
16
17- 18
19
20
22-24
25-26
27
28-30
31
32
33
34-35
36
37-39
40
41
42-46
48-49
50
51-60
62-63
64
65
66
67-68
69-77
78
79-82
83
84-85
86
87

GENERAL DIMENSIONS
Below are the general dimensions of the 1973 TX Starfire. You
will note that the styling and some important dimensions have
changed. These changes were made to further improve the
handling characteristi cs of this machine.
As compared to the 1972 Polaris TX Starfire the '73 chassis is
6" longer (Note 'A'). This is required for improved turning
and handling. The ski stance for '73 is 3" wider for better
stability (Note 'B') and more precise steering control on tight
corners.
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SPECIFICATIONS
The specifications on this page are very general. More detailed
specifications
will be covered under each separate item.
ITEM
294 335 439 649
TX Starflame Number
of Cylinders 2 2 3
Engine
Bore 58mm 62mm 58mm 67.75mm
Stroke 55. 6mm
55.6mm 55.5mm 60mm
Carburetor Mikuni
Mikuni Keihin Keihin
VM34 VM36 RD38 RD50
Displacement 293.79cc 335.7cc 439.9cc 648.8cc
Material Aircraft Aluminum
Chassis Overall Length
106" 106" 106"
106"
Overall Width
37"
37"
37"
37"
Overall Height
34" 34" 34" 34"
Weight
Track Track Width
15" 15 " 15" 15"
Track Material Rubber
with machine riveted cleats or molded rubber
Standard gear ratio
13.35 16.39 16.35 17.35
Ignition Type
Kokusan Capacitor Discharge
Timing Specs (5000 3.5mmBTDC 3.5mmBTDC 3.5mmBTDC 3.75mmBTDC
RPM)
26"
26"
26" 26"
*Spark Plugs
(Champion) N57 N57 N57 N57
Plug Gap
.018"
.018"
.018" .018"
Fuel System Tank Capacity 3.5
U.S. Gal . 3.5 U.S. G•l. 3.5
U.S. Gal. 3.5 U.S. Gal.
Fuel Type Premium, not less than
98 octane
Mixing Ratio 16: 1 Four gallons to one quart
Brakes
Type Hydraulic Disc Brakes
Disc Diameter
7l4" 7l4" 7l4" 7l4"
Fluid Type Automotive Hydraulic Brake Fluid
Suspension Type Equaliberator Slide Rail
*Machines come equipped from factory with Champion N59G
Spark plugs. Use these plugs for break-in ONLY. After break-
in, install N57 Champion Spark
Plugs.
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