NGK BR10EIXequivalent & cross reference

The NGK BR10EIX spark plug is directly equivalent to DENSO IW27, confirmed by shared applications in both manufacturers' official catalogues.

Equivalents

Part	Shared applications	Agreement
DENSO IW27	9	82%

Aprilia AF1 125 (1988–1991)
Aprilia Classic 125 (1995–2001)
Aprilia RS 125 (1992–2005)
Aprilia RX 125 (1992–1999)
Aprilia RX 125 (2008–2012)
Aprilia SX 125 (2008–2013)

Equivalence confirmed by 3 independent sources, last verified 22 July 2026. Always confirm fitment against your owner's manual.