NGK SILMAR9A9S Spark Plug – Honda OE 31909-MEN-A31 / 6213
1 genuine NGK SILMAR9A9S Laser Iridium spark plug for the listed Honda CRF450 application.
Primary Fitment
Honda exact-part / OE reference.
Exact-part listing for NGK SILMAR9A9S / stock 6213. The uploaded source identifies Honda OE 31909-MEN-A31; keep this as a cross-reference and confirm against the exact Honda parts catalogue or fitted plug.
NGK Specification
- NGK part number: SILMAR9A9S
- NGK stock number: 6213
- Technology: Laser Iridium
- Wrench / hex size: 14 mm
- Thread diameter: 10 mm
- Thread reach: 26.5 mm
- NGK catalogue spark gap: 0.9 mm
- NGK application note: racing use / optional on the current EMEA catalogue
Honda OE / Cross-Reference
31909-MEN-A31 is retained from the original product data as a Honda spark-plug cross-reference for SILMAR9A9S. Because I could not locate a current Honda primary online parts page for this number, confirm it against the motorcycle's VIN, Honda parts catalogue or fitted plug before ordering.
DENSO Cross-Reference
DENSO's current NGK cross-reference table lists SILMAR9A9S but does not provide a direct DENSO standard, Iridium Power or Iridium Tough replacement.
Other Verified Applications
- Honda CRF450R — 2009–On — 1 plug
- Honda CRF450RX — 2017–On — 1 plug
- Honda CRF450RWE Works Edition — 2019–2026 — 1 plug
Compatibility Check
Confirm SILMAR9A9S / stock 6213, exact CRF450 model and model year before ordering. CRF450R, CRF450RX and CRF450RWE are different competition models and their model-year ranges should not be treated as interchangeable.
Google Search Terms / Product Identifiers
NGK SILMAR9A9S, NGK 6213, Honda 31909-MEN-A31, Honda CRF450R spark plug, Honda CRF450RX spark plug, Honda CRF450RWE spark plug, CRF450 spark plug, Laser Iridium motorcycle spark plug, 10mm racing spark plug.
Delivery & Returns
- Free UK delivery with an estimated 2–3 working-day service
- 30-day returns, subject to the item being returned in its original condition