NGK 95134 Iridium IX Spark Plug (CPR8EAIX-9) for Honda H’ness CB350 / CB350RS

Precision-Built Iridium IX Spark Plug for Honda CB350 Platform

The NGK CPR8EAIX-9 Iridium IX spark plug is specified for Honda’s 350cc platform, including the H’ness CB350 and CB350RS. Built with NGK’s fine-wire iridium electrode design, this plug is engineered to deliver consistent ignition performance under standard riding conditions.

At the core is a 0.6 mm iridium centre electrode, designed to maintain stable spark characteristics across repeated heat cycles. Compared to conventional nickel plugs, iridium construction helps retain electrode shape over time, supporting consistent combustion behaviour during regular use.

What This Means in Real Riding Conditions

In practical terms, a stable spark contributes to:

• Smoother idle characteristics
• Cleaner combustion cycles
• Predictable throttle response

These are not performance modifications, but refinements in how the engine operates within its designed parameters.

Built for Daily Use, Not Just Specs Sheets

The CB350 platform is known for refinement-focused riding. This plug aligns with that intent:

• Maintains ignition consistency in city traffic and touring conditions
• Designed to resist carbon fouling under normal usage
• Handles temperature variation during stop-go and highway riding

It’s a reliability-focused component — not a tuning part.

Specification-Driven Fitment

This spark plug should only be used where CPR8EAIX-9 is specified by Honda.

Confirmed Fitment:

• Honda H’ness CB350
• Honda CB350RS

Compatibility is strictly based on spark plug specification — not engine size similarity.

🔧 Additional Compatibility (Specification-Based)

The NGK CPR8EAIX-9 spark plug is used across multiple motorcycles where this exact specification is required.

Honda

• H’ness CB350
• CB350RS
• Hornet 160R / Hornet 2.0
• Unicorn 150 / 160
• X-Blade
• CB Trigger
• SP Shine 125

Hero MotoCorp

• Xpulse 200 / 200T
• Xtreme 160R / 200S / 200R
• Impulse

Bajaj

• Pulsar NS200 / RS200 / AS200 (Side Plug)
• Dominar 400 (Side Plug)
• Pulsar 150 / 180 / 220

TVS

• Raider 125
• Jupiter / Zest / Wego

Yamaha

• FZ V3 / FZS V3

Aprilia

• SR125 / SR160 / SXR160
  
  

Technical Highlights

• Fine-wire Iridium Centre Electrode (0.6 mm)
• Resistor Type Plug (EMI suppression)
• Heat Range: 8
• Thread Diameter: 10 mm
• Thread Reach: 19 mm
• Hex Size: 16 mm

Service & Usage Notes

• Sold as a single unit
• Install using correct torque specifications
• Replace as per manufacturer service interval

Iridium plugs are designed for extended durability, but actual lifespan depends on:

• Fuel quality
• Riding conditions
• Engine health

Summary

The NGK CPR8EAIX-9 is a specification-correct iridium spark plug for Honda’s 350cc platform. It focuses on consistent ignition, durability, and stable combustion, aligning with the refinement characteristics of the CB350 engine.