Autolite Small Engine Spark Plug, 3924 for Select Briggs, Stratton, Kohler Power Equipment and Lawn Mowers
Autolite Small Engine Spark Plug, 3924 for Select Briggs, Stratton, Kohler Power Equipment and Lawn Mowers
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Autolite Small Engine Spark Plug, 3924 for Select Briggs, Stratton, Kohler Power Equipment and Lawn Mowers

4.5 stars out of 536 reviews
(4.5)|
536 ratings

Key item features

  • Compatibility: The Autolite Small Engine Spark Plug, 3924 replaces Champion (RC12YC, RN9YC, RN11YC4), NGK (BCPR5EY, BKR5E, BKR5EY, BKR6E), Briggs & Stratton (496018S), and E3 (E3.20) spark plugs.
  • Application: Fits select models of Briggs & Stratton, Kohler engine power equipment, and lawn mowers/garden tractors from brands like Husqvarna, Gravely, Cub Cadet, Poulan, Ariens, John Deere, Agco Allis, Toro, Massey Ferguson, Bobcat, and more.
  • Durable Design: Features a copper-glass seal for a gas-tight, leak-proof bond, and a multi-rib insulator to reduce flash-over risk.
  • Enhanced Performance: One-piece terminal post adds strength, while the resistor reduces radio frequency interference (RFI) and electrode erosion.
  • Precision Engineering: Cold-formed steel shell with precision rolled threads and a full copper core electrode for better performance in all conditions.
  • Maintenance Tip: Autolite highly recommends consulting your equipment's repair manual for specific instructions on changing the spark plug.
  • Long-lasting: Engineered for long life, suitable for lawn mowers, motorcycles, recreational vehicles, and other small power equipment.
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Current price is $2.38
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Customer ratings & reviews

4.5 out of 5 stars
stars536 ratings216 reviews
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Reviews summary

Pros

  • : Offers lower cost compared to others.
  • : Made to last with proper fitment.
  • : Compatible with various lawn mower models.
  • : Simple process with clear instructions.
  • : Designed to fit various engines and lawn mowers.

Neutral

  • : Can be reliable and durable, but may arrive defective or mismatched.
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Showing 1-3 of 216 reviews

Dec 21, 2025
Mark
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Very good plugs next to champion. I probably believe they're the best plugs I've ever put in my Harley Davidson.

Helpful?3cdde9e0-0b0e-11f1-85c1-b9be452911c7763707525
Mar 23, 2026
mrDubb
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

spark plug

what can i say its a spark plug put it in fired off thats what they do good price

Helpful?3cdde9e0-0b0e-11f1-85c1-b9be452911c7763707525
Feb 10, 2026
frank
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Ordered two packages of 4 they came in 3 orders

Helpful?3cdde9e0-0b0e-11f1-85c1-b9be452911c7763707525