Honda VTX1300C Spark Plug Replacement Guide (2004-2009)
Keep your V-twin running smoothly with the right spark plugs and avoid common replacement mistakes.
- Your VTX1300 has four spark plugs, two per cylinder; make sure to replace all four at the same time.
- The OEM-recommended plug is the NGK DCPR6E, which is the best choice for most riders.
- Always check and set the spark plug gap to 0.031-0.035 inches before installation.
- Replacement is an easy DIY job that does not require removing the gas tank.
Signs of Failing Spark Plugs on Your VTX1300
Worn-out spark plugs can cause noticeable problems with your motorcycle's performance. Because the VTX1300 engine is carbureted, it's sensitive to the condition of its ignition components. Look out for these common symptoms:
- Hard Starting: The engine turns over but struggles to fire up, especially when cold.
- Rough Idle: The engine idles unevenly or feels shaky when you're stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration. This can sometimes cause popping or backfiring from the exhaust, especially when you let off the throttle.
- Poor Fuel Economy: If you notice you're filling up your tank more often, failing plugs could be the cause.
- Loss of Power: The bike may feel sluggish and less responsive than usual.
A Note on Engine Misfire Codes
If your check engine light comes on, codes like P0300 (random misfire), P0301 (cylinder 1 misfire), or P0302 (cylinder 2 misfire) point directly to an ignition problem, with spark plugs being the most common culprit.
Choosing the Right Aftermarket Spark Plugs
When shopping for spark plugs for your VTX1300C, you have a few choices. Sticking close to the original equipment (OEM) design is almost always the best path for this engine.
Brand Tiers
- Tier 1 (OEM Equivalent): NGK
NGK is the original manufacturer for Honda's spark plugs. The standard plug recommended in the service manual is the NGK DCPR6E. This is the workhorse plug that your bike was designed to use. Aftermarket NGK plugs are identical to those from a Honda dealer, just without the Honda logo on the box. For most riders, this is the best and most reliable choice. - Tier 2 (Value Alternative): Champion
Champion is a well-known brand that produces compatible spark plugs. While not the OEM supplier for Honda, they offer a functional and budget-friendly option. However, most VTX owners and Honda mechanics strongly prefer sticking with NGK for proven performance and reliability.
Iridium vs. Standard Copper Plugs
You will see more expensive Iridium plugs available, like the NGK Iridium IX. These plugs have a harder electrode and can last longer than standard copper plugs. While they provide a quality spark, the standard NGK DCPR6E copper plug is more than adequate for the VTX1300 and what the service manual recommends. 🎬 Watch: A quick breakdown on choosing the right plugs for your VTX. Given the low cost and ease of replacement, many owners stick with the standard plugs and change them more frequently.
| Part Type | Price Range (Per Plug) |
|---|---|
| Aftermarket Standard (NGK, Champion) | $3.91 - $8.00 |
| Aftermarket Iridium (NGK) | $9.00 - $14.32 |
Vehicle-Specific Issues & Recalls
There are no known recalls or technical service bulletins (TSBs) from Honda related to spark plugs for the 2004-2009 VTX1300. However, a safety recall was issued for some 2007-2008 models.
Recall Notice: NHTSA campaign 08V141000 was issued for some 2007-2008 VTX1300 motorcycles for a faulty fuel control valve diaphragm that could leak fuel, creating a fire risk. This is unrelated to the spark plugs but is a critical safety issue to be aware of for these model years.
Frequently Asked Questions
How many spark plugs does the VTX1300 have?
The Honda VTX1300 has a total of four spark plugs. There are two plugs for the front cylinder and two for the rear cylinder. Many owners are surprised by this, so make sure you buy four plugs to do the job right.
🎬 Watch: Step-by-step guide to installing all four spark plugs.What is the correct spark plug gap for a VTX1300?
The correct gap is between 0.031 and 0.035 inches (0.8mm - 0.9mm). Most mechanics set the gap to 0.033 inches. Always check the gap on new plugs before installing them, as they can be knocked out of spec during shipping.
🎬 See how to properly check and gap your VTX spark plugs.Should I use anti-seize on the spark plug threads?
Yes, it is a good practice. Applying a small amount of anti-seize compound to the plug threads helps prevent them from getting stuck (galling) in the aluminum cylinder heads. Be careful not to get any on the electrode. Also, use a dab of dielectric grease inside the spark plug boot to prevent it from sticking to the plug and to keep moisture out.
Are hotter or colder plugs needed for a VTX1300?
For most riding, the standard NGK DCPR6E is perfect. However, if you do a lot of extended high-speed highway riding, the service manual recommends a 'colder' plug like the NGK DCPR7E to better manage heat and prevent pre-ignition.
Helpful Videos
Technical Specifications
OEM Part Numbers: 98079-56846 98079-56876
Standard Plug: NGK DCPR6E or Denso XU20EPR-U. High-Speed Plug: NGK DCPR7E or Denso XU22EPR-U. Quantity: 4. Gap: 0.031"-0.035" (0.8mm-0.9mm). Socket Size: 5/8" (16mm). Torque: 10 ft-lbs.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Honda VTX1300C: