Stens 055-100 Spark Plug - Kohler 25 132 28-S

What It Is

The Stens 055-100 Spark Plug is a direct replacement for the Kohler 25 132 28-S spark plug, designed for small engines in lawn mowers, tractors, and zero-turn mowers. It provides the ignition spark needed for combustion, suitable for routine maintenance or troubleshooting hard-starting engines.

Fitment & Compatibility

• OEM Cross-Reference: Replaces Kohler 25 132 28-S and Stens 055-100. Not compatible with other Kohler plug numbers (e.g., 12 132 01).
• Engine Fit: Works with Kohler Courage, Command, and Command Pro engines (single-cylinder and V-twin) – check your engine model plate for the exact plug number.
• Gap & Thread: Pre-gapped at 0.030 inches (0.76 mm), but always verify with a feeler gauge. Thread size is 14mm with a 3/4-inch reach and a gasket seat.
• What to Check Before Buying: Look at your current plug’s number – if it’s Kohler 25 132 28-S, this fits. For other Kohler plugs (e.g., 25 132 12), measure reach and seat type; this plug may not work.

Key Things to Know

• Quality vs. OEM: Stens is a reputable aftermarket brand – this plug is functionally identical to the Kohler OEM but costs less. No performance difference in standard engines.
• Installation Difficulty: Easy – remove boot, unscrew old plug with a socket, gap-check new one (adjust if needed), hand-tighten then torque to 15-20 ft-lbs. Over-tightening can crack the ceramic.
• Common Gotcha: Even though pre-gapped, always verify – shipping can shift the gap. Also, don’t use anti-seize on the threads; it can affect torque readings.
• Life Expectancy: Typically 100-200 hours of use; replace annually or if you see carbon buildup, worn electrode, or misfire.

Should You Buy It

Buy this if you need a reliable, budget-friendly replacement for a Kohler 25 132 28-S plug in a push mower, rider, or zero-turn. It’s a solid choice for DIY maintenance – just double-check the gap and engine model. Avoid if your engine uses a different plug number or requires a resistor-type plug (this is non-resistor).