Replacement Spark Plug for Toro 81-3250 for NGK BPR6ES 119-1901 121-0186 121-0396 89947 ST31234 ST62113 Lawn Mower Models

What It Is

This is a replacement spark plug designed for Toro lawn mowers that use the NGK BPR6ES (or equivalent) plug. It’s the component that ignites the fuel-air mixture in the engine cylinder, critical for starting and smooth operation.

Fitment & Compatibility

• Direct fit for Toro models using OEM part numbers 81-3250, 119-1901, 121-0186, 121-0396, 89947, ST31234, and ST62113.
• Cross-references to NGK BPR6ES—a standard spark plug for many small engines (Briggs & Stratton, Kohler, Kawasaki).
• Check your current plug: Remove the old plug and compare the thread size (14mm), reach (19mm), hex size (13/16″ or 21mm), and gap (typically 0.030″). If it matches, this plug will work.
• Not universal: Verify your Toro model number under the seat or on the engine shroud. This plug won’t fit all Toro mowers—only those compatible with the listed OEM numbers.

Key Things to Know

• Quality: NGK is a trusted OEM supplier; this plug is equivalent to the factory part. Expect reliable ignition and long life (100+ hours typical).
• Installation: Easy—remove the old plug with a socket wrench, gap the new one to 0.030″ (use a gap gauge), hand-tighten, then 1/2 turn with a wrench. Over-tightening can damage threads.
• Common gotcha: The plug may arrive pre-gapped, but always verify and adjust before installing. A wrong gap causes misfires or hard starting.
• Price: $7.99 is fair—about the same as a retail NGK BPR6ES. No need to pay more for “OEM” branding.

Should You Buy It

If your Toro mower uses any of the listed OEM numbers and you need a reliable, direct-fit replacement at a fair price, this plug is a solid choice. It’s ideal for DIY maintenance—no special tools or expertise required. Avoid if your mower uses a different plug type (e.g., resistor or surface-gap plug).