NGK Iridium IX Spark Plug for Royal Enfield Classic 350 / Bullet 350 BS6, Thunderbird 500 & Continental GT 535 (BPR5EIX)

NGK Iridium IX. A 0.6mm fine-wire iridium centre electrode in place of a conventional one, firing a sharper, more focused spark.

On a big single that has to light cleanly from cold every morning, that means easier starting, a steadier idle and cleaner running. Iridium barely erodes, so the gap holds long after a nickel plug would have widened.

Direct fit. Nothing to adjust.

Find your bike

Royal Enfield 350, BS6 Single plug, takes 1

• Classic 350 ABS single channel
• Classic 350 ABS dual channel
• Classic 350 Signals
• Bullet 350 ABS single channel
• Bullet 350 KS & ES

Royal Enfield 500, BS4 Single plug, takes 1

• Thunderbird 500 · Thunderbird 500X ABS dual channel
• Classic 500 ABS
• Bullet 500 Trials · Bullet 500 ABS
• Continental GT 535

Royal Enfield UCE twin-spark Takes this plug plus one more

• 350, BS3 and BS4 · Thunderbird 350 · Thunderbird 350X ABS dual channel · Classic 350 · Bullet 350 Trials · Electra 350 BS3
• 500, BS3 only · Thunderbird 500 · Classic 500 · Bullet 500

Those twin-spark engines need this plug and a CPR6EAIX-9S. We sell both together as a complete kit, which is the easier way to buy it.

The 500 changed with BS4. The BS3 500 is twin-spark and needs two plugs. The BS4 500 runs a single plug, this one. Royal Enfield's own BS3 manual is explicit that two plugs are fitted, so if your 500 predates BS4 you want the kit, not this plug on its own. Not sure which you have? Send us your registration year.

The cast-iron Bullet takes the BR6HIX. The J-series 350 from 2020 (Classic, Meteor, Hunter) is a different engine again.

Specifications

• Part number · BPR5EIX
• Type · Iridium IX, 0.6mm fine wire
• Heat range · 5
• Thread · 14mm
• Conventional equivalent · BPR5ES
• Sold as · single plug or pair

Fitting

Arrives pre-gapped and ready to fit. Thread in by hand first, then torque to your manual's figure. If you check the gap, move the outer electrode only.

Unsure which you need? Send us your bike and year and we will confirm before you order.