NGK SPARK PLUGS DCPR7EIX 97637 Iridium IX Spark Plug 10 PACK

OVERVIEW

The DCPR7EIX delivers precise ignition control and optimized fuel combustion through its advanced iridium technology, ensuring reliable startup and consistent throttle response across demanding riding conditions. Constructed with an ultra-fine iridium center electrode and reinforced with an anti-corrosion plated steel shell, these plugs are built to withstand high thermal stress while extending ignition system lifespan. Designed specifically for select Harley-Davidson motorcycles, they provide a direct factory replacement without requiring ECM recalibration or wiring modifications.

ENGINEERING & PERFORMANCE

The ultrathin iridium center electrode operates at a significantly lower voltage threshold than conventional nickel-plated alternatives, reducing electrical strain and promoting faster ignition timing. This compact design minimizes fouling while maintaining a stable spark gap under heavy load and extreme temperatures. Enhanced shell plating actively resists moisture ingress and corrosion, preserving electrical conductivity throughout the service interval. As a direct bolt-on replacement, the plug maintains OEM-style clearance and thread engagement for seamless installation.

KEY FEATURES

• Performance-grade Iridium IX spark plug designed for enhanced ignition efficiency
• Ultra-small diameter iridium center electrode reduces ignition voltage requirements
• New metal shell plating provides elevated anti-corrosion protection
• Extended ignition system service life between replacement intervals
• Direct OEM-style replacement without fabrication or tuning modifications
• Multi-model compatibility across select Harley-Davidson Sportster, Softail, Dyna, and Touring platforms
• Packaged in a 10-piece count for complete cylinder ignition coverage
• Engineered to maintain consistent spark performance under high-RPM cruising and low-speed maneuvering

TECHNICAL SPECIFICATIONS

• Brand: NGK
• Part Name: DCPR7EIX (97637) Iridium IX Spark Plug
• Component Type: Spark Plug
• Material: Iridium IX center electrode with anti-corrosion plated steel shell
• Supported Years: 2004–2016
• Compatible Trims: Harley-Davidson Sportster, Softail, Dyna, TwinCam, and Touring platforms (exact model codes listed per year bracket)

FITMENT

• Harley-Davidson Fat Boy S (2016)
• Harley-Davidson Softail Slim S (2016)
• Harley-Davidson Road Glide Ultra (2015–2016)
• Harley-Davidson Breakout (2015–2016)
• Harley-Davidson Electra Glide Ultra Limited Low (2015)
• Harley-Davidson Electra Glide Ultra Classic Low (2015)
• Harley-Davidson Road Glide Special (2015)
• Harley-Davidson Freewheeler (2015)
• Harley-Davidson Road Glide Custom (2015)
• Harley-Davidson SuperLow XLT (2014–2016)
• Harley-Davidson Street Glide Special (2014–2016)
• Harley-Davidson Street Glide EFI (2014–2016)
• Harley-Davidson Sportster Seventy-Two (2012–2016)
• Harley-Davidson Switchback (2012–2016)
• Harley-Davidson Softail Slim (2012–2016)
• Harley-Davidson Wide Glide EFI (2012–2016)
• Harley-Davidson Softail Deluxe EFI (2012–2016)
• Harley-Davidson Softail Fat Boy EFI (2012–2016)
• Harley-Davidson Softail Heritage Classic EFI (2012–2016)
• Harley-Davidson Fat Boy Lo (2012–2013)
• Harley-Davidson Blackline (2011–2013)
• Harley-Davidson 883 SuperLow XLL (2011–2016)
• Harley-Davidson 1200 Custom EFI (2011–2016)
• Harley-Davidson Sportster 1200 X / XR (2011–2012)
• Harley-Davidson Street Glide Trike (2010–2011)
• Harley-Davidson Sportster Forty-Eight XLX (2010–2016)
• Harley-Davidson Electra Glide Ultra Limited (2010–2016)
• Harley-Davidson Iron 883 (2009–2016)
• Harley-Davidson Road King EFI (2009–2016)
• Harley-Davidson Electra Glide Ultra Classic EFI (2009–2016)
• Harley-Davidson Electra Glide Classic EFI (2009–2013)
• Harley-Davidson Sportster 1200 XR (2009–2010)
• Harley-Davidson Fat Bob (2008–2016)
• Harley-Davidson Street Bob (2008–2016)
• Harley-Davidson Super Glide Custom EFI (2008–2014)
• Harley-Davidson Softail Rocker C (2008–2011)
• Harley-Davidson Softail Cross Bones (2008–2011)
• Harley-Davidson Super Glide EFI (2008–2010)
• Harley-Davidson Low Rider EFI (2008–2009, 2015–2016)
• Harley-Davidson Softail Rocker (2008–2009)
• Harley-Davidson 1200 Nightster (2007–2012)
• Harley-Davidson 1200 Low EFI (2007–2011)
• Harley-Davidson Softail Custom EFI (2007–2010)
• Harley-Davidson 1200 Custom EFI (2007–2010)
• Harley-Davidson 883 Low EFI (2007–2010)
• Harley-Davidson Softail Night Train EFI (2007–2009)
• Harley-Davidson 883 Custom EFI (2007–2009)
• Harley-Davidson Roadster EFI (2007–2008)
• Harley-Davidson Road King Custom EFI (2007)
• Harley-Davidson Softail Deuce EFI (2007)
• Harley-Davidson Sportster 1200 XL 50 (2007)
• Harley-Davidson Softail Standard EFI (2007)
• Harley-Davidson Street Glide (2006–2008)
• Harley-Davidson Softail Heritage EFI (2006–2007)
• Harley-Davidson Super Glide FXD (2006–2008)
• Harley-Davidson Softail Night Train (2006–2007)
• Harley-Davidson Softail Standard FXST (2006–2007)
• Harley-Davidson Softail Springer EFI (2006–2007)
• Harley-Davidson Softail Springer (2006)
• Harley-Davidson Softail Heritage (2006)
• Harley-Davidson Wide Glide EFI (2006–2016)
• Harley-Davidson Softail Deluxe (2005–2016)
• Harley-Davidson 883 Roadster (2005–2006)
• Harley-Davidson Super Glide Custom (2005–2008)
• Harley-Davidson 883 EFI (2007)

WHY RIDERS CHOOSE THIS

Riders consistently select this plug because the Iridium IX electrode architecture forces more efficient fuel atomization, delivering sharper throttle response and harder cold starts over traditional nickel alloys. The ultra-fine center wire operates at a lower voltage threshold, taking the load off aging ignition coils and capacitive discharge units common in larger displacement engines. Coupled with a corrosion-resistant outer shell, the plug maintains a pristine spark gap despite constant road vibration and temperature cycling. As a precise direct-fit component, it drops effortlessly into restricted cylinder head channels without altering timing maps or requiring adapter hardware. This combination of sustained ignition stability and hassle-free installation makes it a preferred upgrade for touring and cruiser platforms that demand dependable power delivery mile after mile.