Content Source: 2019 850 PRO-RMK / SKS 155 Owner’s Manual (9928946 R01) > The Perfect Fit Chapter

IMPORTANT

The Owner's Manual for this vehicle contains warnings, instructions and other information you must read and fully understand before safely riding or performing maintenance on this vehicle.Always follow the warnings and instructions in Owner's Manual.

Click the CONTENTS link above for the Table Of Contents, or download a full PDF of the Owner Manual in the Owner Support area of Polaris.com

Chaincase Gearing (if equipped)

A speed sensor reads the speed of the brake disc on the jackshaft. The engine management system uses this signal to determine vehicle speed.
If changes are made to either the upper or lower chaincase sprocket, the engine management system must be updated to set the new drive ratio. Please see your POLARIS dealer to reprogram the speedometer offset calibration if you install different chaincase sprockets.

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