Polaris 850 PRO-RMK 155 2020 Manual page 31

ENGINE SPECIFICATIONS
Patriot Liquid-Cooled /
Engine Type
Case Reed Induction
Model Number S6031-8444-LP8R
Displacement
840 cc
Number of Cylinders
2
Bore & Stroke 85 x 74 mm
Operating RPM ± 150
8250
Idle RPM ± 200 1800
Engagement RPM ± 200
3800
Thermostat Opening
80-87 ° F / 29.7-30.6 ° C
Temperature
FUEL SYSTEM
Type - Number of Fuel
DC-CFI - 2
Injectors
Throttle Body Marking
1205875
Throttle Body Bore
50 mm
TPS Voltage @ Idle
0.86 +/- 0.05 VDC
(Using Digital Wrench)
Fuel Pressure 58-60 PSI / 4.0-4.1 bar
<91 Octane
Fuel Octane (R+M/2)
(Non-Oxygenated)
10% Ethanol Mode
OR
87/89/91+
(Up to 10% Oxygenated)
91+
Premium Mode
(Non-Oxygenated)
TRACK
Width 15 in / 38 cm
Length
155 in / 393.7 cm
Pitch 2.86 in / 7.26 cm
2.25 in / 5.72 cm (Peak)
Lug Height 2.40 in / 6.10 cm (Series 5.1)
2.60 in. / 6.60 cm (Series 6)
Track Tension 0.625 - 0.75 in / 1.6 - 1.9 cm
Stud Protection
N/A
Maximum Stud Length
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
© Copyright Polaris Inc.
GENERAL INFORMATION
ELECTRICAL
Alternator Output
Operating Voltage 13.5-14.5 VDC
Watts @ 13.5 VDC (Total) 500
Idle Ignition Timing
(Variable - Based on RPM,
2° – 20°
Pressure, and Temp.)
Spark Plug
NGK BPR9ES
Spark Plug Gap
.027 in / .70 mm
FRONT SUSPENSION
Front Suspension Type AXYS RMK Adjustable
Walker Evans Comp. Adj.
Front Shock
Piggyback*
Front Travel 9.0 in / 22.9 cm
Ski Type Gripper
39 - 40 - 41 in / 99.1 - 101.6 -
Ski Center Distance
104.1 cm
Setup Width
36.85 in / 93.6 cm
Overall Toe Out 1/8 - 1/4 in / 3 - 6 cm
* = Reference Steering / Suspension chapter for shock
settings.
REAR SUSPENSION
Rear Suspension Type
AXYS RMK
Walker Evans Impact-
Front Track Shock (FTS)
Extruded Monotube*
Walker Evans Comp. Adj.
Rear Track Shock (RTS)
Piggyback*
Rear Travel 16.0 in / 40.6 cm
* = Reference Steering / Suspension chapter for shock
settings.
For clutch settings; See 850 SKS 155 Clutch Settings
page 1.60 later in this chapter.
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