4 Autolite 104 Spark Plug – Copper Core – Crosses to NGK TR55 / Champion 401 / Denso
Table of Contents
Why Choose Autolite Spark Plugs?
When it comes to engine performance, the spark plug is a small component that makes a big difference. Non-OEM or generic spark plugs may save you a few dollars upfront, but they often lead to hard starting, misfiring, and reduced engine efficiency.
At Red Rock Turf, we prioritize reliability and performance. That’s why we stock genuine Autolite spark plugs for our equipment repairs and recommend them for your small engine and automotive needs. With decades of engineering expertise, Autolite delivers the quality and consistency your equipment deserves.
Item Specifics: Complete Technical Specifications
| Specification | Details |
|---|---|
| Product Type | Autolite Copper Spark Plug |
| Part Number | 104 |
| Quantity | 4 Spark Plugs |
| Cross References | NGK 3951 (TR55), 2238 (TR5), 3623 (BPR6EFS); Champion 401, 401CC, 408, 4401, 45, 46, 4983 |
| Electrode Design | Standard |
| Electrode Material | Nickel |
| Hex Size | 5/8″ |
| Thread Diameter | 14mm |
| Reach | 10.2466mm |
| Seat Type | Tapered |
| Gap | 1.27mm |
| Heat Range | 9 |
| Center Electrode | Mid Projection |
The Autolite 104 Copper spark plug delivers quick starts and reliable performance for your engine applications. With its copper core center electrode and high nickel alloy construction, this plug provides excellent thermal control and extended service life. A direct cross to multiple NGK and Champion part numbers.
Cross Reference Guide: Replace NGK, Champion & Others
| Brand | Part Numbers |
|---|---|
| Autolite | 104 |
| NGK | 3951 (TR55), 2238 (TR5), 3623 (BPR6EFS) |
| Champion | 401, 401CC, 408, 4401, 45, 46, 4983 |
This Autolite 104 replaces multiple competitor part numbers, making it a versatile choice for your engine maintenance. Whether you’re switching from NGK or Champion, this plug offers the same specifications with Autolite’s trusted copper core performance.
The Advantage of Copper Core Technology
- Copper Core Design: The copper core center electrode aids in thermal control and improves resistance to fouling, ensuring reliable starts in all conditions.
- Extended Life Construction: High nickel alloy center and ground electrode provides durability and long service life, reducing replacement frequency.
- Superior Insulation: High alumina multi-rib ceramic insulator delivers thermal conductivity and increased strength for consistent spark delivery.
- Corrosion Resistant: Nickel-plated shell prevents corrosion for enhanced durability in various operating conditions, from high humidity to temperature extremes.
Autolite’s copper core technology isn’t just about performance—it’s about peace of mind. With proper installation and gapping, these spark plugs will deliver thousands of reliable starts throughout their service life.
Compatibility and Common Applications
| Application Type | Common Equipment |
|---|---|
| Thread Specification | 14mm diameter, 10.2466mm reach, tapered seat |
| Automotive | Older vehicles, small engines, classic cars |
| Lawn & Garden | Riding mowers, tractors, commercial turf equipment |
| Outdoor Power Equipment | Generators, pressure washers, pumps |
Always consult your equipment’s owner’s manual to verify the correct spark plug specification before purchasing. If you’re unsure whether these plugs fit your specific engine, contact us with your equipment make and model.
Backed by Expertise: Red Rock Turf’s Commitment to Quality
As a trusted distributor for Briggs & Stratton, Kohler, and Toro, Red Rock Turf has been serving the turf equipment industry for years. We don’t just sell parts—we use them in our own rebuilds and repairs, ensuring that we stand behind their quality.
Our team is here to help you find the right spark plugs for your engine. If you don’t see what you’re looking for on our website, contact us at [email protected], and we’ll do our best to source it for you. We also ship internationally, making it easy for customers worldwide to access premium OEM and aftermarket parts.
Ready to Restore Reliable Starts to Your Engine?
Don’t settle for subpar spark plugs that compromise your equipment’s performance. Invest in these Autolite 104 Copper Spark Plugs and experience quick starts, improved efficiency, and long-lasting durability.
- 📧 Need Help Finding a Part? Contact us at [email protected]
- 🌎 We Ship Internationally – Inquire for a quote!
Frequently Asked Questions
What gap should I set these plugs to?
Answer: These plugs are pre-gapped at 1.27mm, but always verify and adjust according to your equipment manufacturer’s specifications. Gapping may vary depending on your specific engine requirements.
Will these fit my engine?
Answer: Check your owner’s manual for the correct spark plug specification. If your engine requires 14mm thread, 10.2466mm reach, and tapered seat, these plugs will work. If you’re unsure, please email us with your equipment model and we’ll help verify compatibility.
Are these genuine Autolite plugs?
Answer: Yes, these are 100% genuine Autolite Copper spark plugs, not aftermarket copies. Autolite is a trusted brand with decades of engineering expertise.
Why are there 4 plugs in this listing?
Answer: This listing includes 4 spark plugs, making it ideal for multi-cylinder engines or for customers who want to replace all plugs at once for consistent performance.
How does a copper spark plug differ from platinum or iridium?
Answer: Copper spark plugs offer excellent thermal conductivity and are ideal for older engines or applications that require frequent replacement. They provide reliable performance at an economical price point. Platinum and iridium plugs typically last longer but come at a higher cost.
Do you ship internationally, and what are the shipping costs?
Answer: Yes! We ship globally. Shipping costs vary depending on your location and the weight of your order. Contact us at [email protected] for a quote or more details.
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