DENSO IU27equivalent & cross reference

The DENSO IU27 spark plug is directly equivalent to NGK CR9E and NGK CR9EB, confirmed by shared applications in both manufacturers' official catalogues.

Equivalents

Part	Shared applications	Agreement
NGK CR9E	27	87%
NGK CR9EB	6	50%

Verified fitments for the DENSO IU27

Aprilia RS4 125 (2011–2020)
Ducati 749 (2003–2006)
Ducati 996 R R (2001–2001)
Ducati 999 (2003–2006)
Kawasaki ZX-6R (2013 on)
Kawasaki ZXR 750 (1991–1995)
Suzuki RF 900 R (1994–1995)
Yamaha FZR 600 (1989–1989)
Yamaha FZR 600 R (1994–1995)
Yamaha FZS 1000 Fazer (2001–2005)

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