Autolite AR3910X Spark Plug for Briggs LO206, Animal & Clone Kart Engines

The Autolite AR3910X is one of the most commonly run spark plugs in Briggs LO206, Animal, and clone kart engines for a reason. It delivers a clean, consistent spark that holds up through long sessions, heat cycles, and tight race-day tuning windows.

This order is for a single plug and is a direct replacement for the OEM spec used in many sealed and semi-sealed kart classes. Racers like it because it resists fouling, stays stable under compression, and gives predictable throttle response when jetting is close.

• Fits Briggs LO206, Animal, and most clone kart engines
• Direct OEM-style replacement, no guessing on fit
• Handles heat and compression without loading up
• Consistent spark for cleaner acceleration off the corner

Gap matters with any LO206 plug. If you want to get more out of this plug, learn how to read it properly after a run. We put together a simple, racer-focused guide that walks through color, strap timing, and what the plug is telling you.

Read our LO206 spark plug reading guide here

SKU: AR3910X