RC12YC Spark Plug 992304 for OHV Engines | 450E 500E 625E

Keep your overhead valve engine running at peak performance with this high-quality RC12YC Spark Plug (Part No. 992304). Designed as a direct replacement for a wide range of OHV engines, this spark plug delivers reliable ignition, efficient combustion, and long-lasting durability — making it an essential maintenance part for your lawn mower, ride-on, or garden power equipment.

Made in Mainland China.

Key Features

• Direct Replacement: Equivalent to RC12YC / Part No. 992304 (BS-OHV) — correct fit guaranteed
• Wide Compatibility: Suitable for OHV (Overhead Valve) engines including 450E, 500E, 550E, 575EX, 625E, 650E, 675EX, 700, 700E, 800E, 850, 875, 850E, 875EX, 850EX, 950, Intek, Vanguard, and Power Built series
• Small Single-Cylinder OHV Ride-On Engines: Compatible with 6hp, 8hp, 10hp, and 12hp engines
• Premium Construction: Built from high-quality materials for reliable performance and extended service life
• Reliable Ignition: Engineered for consistent spark delivery and efficient fuel combustion
• Easy Installation: Designed for straightforward, hassle-free fitting — no modifications required
• Value for Money: Genuine-spec replacement part — avoid substandard copies and get correct fit, operation, and working life

Compatibility

This spark plug is compatible with the following OHV engine series:

• 450E, 500E, 550E, 575EX, 625E, 650E, 675EX
• 700, 700E, 800E, 850, 875, 850E, 875EX, 850EX, 950
• Intek, Vanguard, Power Built
• Small single-cylinder OHV ride-on engines: 6hp, 8hp, 10hp, 12hp

Package Contents

• 1 × RC12YC Spark Plug (Part No. 992304)

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For more information on small engine maintenance best practices, visit the U.S. EPA Small Engine Technologies page.

Learn more: General Motors LS-based small-block engine

Frequently Asked Questions

Q: What engines is the RC12YC 992304 spark plug compatible with?

A: This RC12YC spark plug (Part No. 992304) is compatible with a wide range of OHV (Overhead Valve) engines including the 450E, 500E, 550E, 575EX, 625E, 650E, 675EX, 700, 700E, 800E, 850, 875, 850E, 875EX, 850EX, 950, Intek, Vanguard, Power Built series, and small single-cylinder OHV ride-on engines from 6hp to 12hp.

Q: Is this spark plug a direct replacement for the OEM RC12YC?

A: Yes, this spark plug is equivalent to and a direct replacement for the RC12YC specification with Part No. 992304 (BS-OHV). It is designed to meet OEM fitment standards for correct installation and reliable operation.

Q: How many spark plugs are included in one order?

A: Each order includes 1 × RC12YC Spark Plug. If you need multiple plugs for fleet or seasonal maintenance, simply adjust the quantity before adding to cart.

Q: How often should I replace the spark plug on my OHV engine?

A: For most residential OHV lawn and garden engines, it is generally recommended to replace the spark plug every season or every 100 hours of operation — whichever comes first. Always consult your engine's owner manual for the manufacturer's specific interval guidance.