Polaris 850 PRO-RMK 155 2020 Manual page 39

ENGINE SPECIFICATIONS
Patriot Liquid-Cooled /
Engine Type
Case Reed Induction
Model Number S6185-8444-LO8R
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 3.0 in. / 7.62 cm
Lug Height 3.0 in. / 7.62 cm (Series 7)
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 React
Walker Evans Impact-
Extruded Monotube*
or
Front Shock
Walker Evans Comp. Adj.
Piggyback
Front Travel 9.0 in / 22.9 cm
Ski Type Gripper
36 - 37- 38in / 91.4 - 93.9-
Ski Center Distance
96.5 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 Impact-
Extruded Monotube*
Rear Track Shock (RTS) or
Walker Evans Comp. Adj.
Piggyback
Rear Travel 16.0 in / 40.6 cm
* = Reference Steering / Suspension chapter for shock
settings.
For clutch settings; See 850 PRO-RMK / RMK Khaos
(155/163/174) 3.0 Track Clutch Settings page 1.61 later
in this chapter.
1
1.33