Polaris 3021671 / Champion RC7YC3 Spark Plug
Updated June 11, 2026
The Polaris 3021671 spark plug (Champion RC7YC3) is a genuine OEM copper spark plug designed for use in select Polaris ATV and side-by-side models. It provides the spark needed to ignite the air-fuel mixture in the combustion chamber, ensuring reliable engine starting, smooth idle, and proper power delivery. This plug is commonly used in 700 and 800 cc engines found in Ranger, RZR, and Sportsman vehicles from the mid-2000s through the 2010s.
AI-generated content
How It Works
The spark plug’s center electrode and ground electrode create a spark gap. When the ignition system delivers high voltage, a spark jumps across the gap, igniting the compressed fuel-air mixture in the cylinder. The RC7YC3 uses a copper core electrode for good heat transfer and reliable spark. Two plugs are required per engine (one per cylinder) on twin-cylinder Polaris models.
Common Failure Symptoms
A worn or fouled spark plug can cause engine misfires, rough idling, hard starting, reduced power, and poor fuel economy. Visual signs include carbon buildup, oil fouling, or electrode erosion. Polaris recommends replacing spark plugs at regular intervals (typically every 100–200 hours or annually) to maintain performance.
Installation Notes
Ensure the engine is cool before removal. Use a spark plug socket to avoid damaging the ceramic insulator. Gap the new plug to the manufacturer’s specification (check service manual for exact gap). Apply a small amount of anti-seize to the threads if recommended, then torque to the specified value (commonly 18–25 ft-lb for these applications). Install only OEM or equivalent Champion RC7YC3 plugs for proper fit.
