VOLTIZER 66538S Spark Plug Boot Kit with Copper Terminal & Insulation Sleeve, Replaces Briggs & Stratton 66538S 4124 493880 493880S, Fits Most 3.5–6.5HP Mower Engines

This VOLTIZER spark plug boot replaces Briggs & Stratton 66538S, 4124, 493880, 493880S, offering a reliable and durable connection for 7mm spark plug wires. It fits a wide range of Briggs & Stratton 3.5–6.5HP vertical-shaft engines found on many lawn mowers, including Sprint, Classic, Quattro, and popular models used by Troy-Bilt, Craftsman, MTD and other outdoor equipment brands. The boot is made from heat-resistant rubber for improved durability, helping protect the ignition wire and ensuring consistent spark delivery. Easy to install and ideal for restoring proper ignition performance on common small engines.

• 1. Precise Replacement for Common Models Replaces Briggs & Stratton 66538S / 4124 / 493880 / 493880S. Designed for 7mm spark plug wire systems used on many B&S vertical-shaft mower engines.
• 2. Wide Compatibility with Mower Engines Fits many Briggs & Stratton 3.5–6.5HP mower engines, including Sprint / Classic / Quattro / 09 Series / 10 Series / 12 Series / 19 Series small engines used on Troy-Bilt, Craftsman, Yard Machines and more.
• 3. Durable, Heat-Resistant Rubber Material Made from strong, heat-resistant rubber that offers a secure grip and long service life. Helps protect ignition wire ends from heat, vibration and moisture in outdoor working conditions.
• 4. Designed for 7mm Spark Plug Wires The standard 7mm plug-wire connection ensures stable contact between the ignition coil lead and spark plug terminal, improving starting performance and reducing misfire risk.
• 5. Easy, DIY-Friendly Installation Simple push-on installation with no special tools required. A practical replacement for worn, cracked or loose spark plug boots on common lawn mower engines.