51670U Beckett Electrode Kit – For AFII Burners with FBX Style Fixed Heads (Up to 9" Blast Tubes)

The Beckett 51670U Electrode Kit is designed for AFII oil burners that use FBX style fixed heads with blast tubes up to 9 inches in length. This OEM-quality kit provides all the components you need to restore reliable ignition performance and maintain proper burner operation.

Kit Includes

• 2 × EA16313M Electrode Insulator Assemblies (for FBX heads)

• 2 × 31891 Electrode Contacts (Spade Terminals)

• 2 × 21705 Transformer Wires

• 2 × 393008 Electrode Extension Rods

• 2 × 3925 Electrode Rod Couplings

⚠️ Important Note

The Beckett T501 gauge is not included with the 51670U Electrode Kit and must be purchased separately, as Beckett does not provide this gauge as part of the kit.

The T501 gauge is essential for:

• Setting the electrode gap and position

• Determining the correct oil nozzle distance from the burner head on AF, AFG, AFII, NX, SF, SM, and SR burners

• Checking firing pin length and motor-to-blower wheel gap on AFII burners

🔧 Common Symptoms Requiring Replacement

If your oil burner needs electrode service or replacement, you may notice:

• Failure to ignite on startup

• Weak or inconsistent ignition spark

• Intermittent burner lockouts

• Excessive soot buildup or smoky flame

• Burnt, cracked, or corroded electrode insulators

❓ Frequently Asked Questions (FAQ)

Q: Does this kit include the T501 gauge?
A: No. The T501 gauge must be purchased separately. Beckett does not provide it with the 51670U kit.

Q: How do I know if I need the 51670U kit?
A: This kit is for AFII burners with FBX style fixed heads and blast tubes 9" or shorter. Check your burner specifications before ordering.

Q: Can I use this kit on AF or AFG burners?
A: No. The 51670U is specifically designed for AFII burners with FBX heads. For AF or AFG burners, you’ll need the 5780 or 5782 kits.

Q: How often should electrodes be replaced?
A: Typically during routine maintenance or if you notice ignition problems, cracks in insulators, or excessive wear on contacts.

💡 Quick Shopper Tips

• Verify your burner uses an FBX style fixed head with a blast tube 9" or shorter before ordering

• Keep a T501 gauge on hand to ensure proper installation and adjustment

• Replace electrodes during routine service for consistent ignition and burner efficiency