Content Source: 2021 RZR Pro XP and Pro XP 4 Owner’s Manual (9931538 R01) > Troubleshooting 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

Engine Backfires

Possible Cause Solution

Out of fuel

Refuel

Weak spark from spark plug

Inspect, clean and/or replace spark plugs

Incorrect spark plug gap or heat range

Set gap to specs or replace plugs

Old or non-recommended fuel

Replace with fresh recommended fuel

Incorrectly installed spark plug wires

Your POLARIS dealer or other qualified person can assist.

Incorrect ignition timing

Your POLARIS dealer or other qualified person can assist.

Loose ignition connections

Check all connections and tighten

Water present in fuel

Replace with fresh recommended fuel

Exhaust leak

Check all connections

Mechanical failure

Your POLARIS dealer or other qualified person can assist.


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