NGK Iridium IX Spark Plug Box of 4 (DR9EIX)

NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug. NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. LAMBORGHINI DIABLO 1996-92, M/C - 1998-1990 DUCATI, 1981-1980 HONDA, 2009-1981 KAWASAKI, 2004-2003 KTM, 1998-1993 MOTO GUZZI, 2005-1980 SUZUKI, 1974-1973 YAMAHA

• RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
• Trivalent metal plating for superior anti-corrosion and anti-seizing properties
• Outstanding acceleration, high fuel efficiency and durability
• Fine iridium tip ensures durable and consistent spark

Upgrade your ignition system with NGK Iridium IX DR9EIX spark plugs, part number 4772, engineered for performance enthusiasts and modified or high-performance applications. Each plug features a fine iridium center electrode that delivers a durable, consistent spark while promoting outstanding acceleration, high fuel efficiency, reliable starting, smooth idling, and responsive throttle control. This set includes four spark plugs for convenient installation or replacement.
NGK Iridium IX technology uses an iridium alloy with an extremely high melting point, making it well suited for the demands of modern engines. The fine-wire center electrode is significantly harder and more durable than platinum, while the tapered-cut ground electrode improves ignitability and helps resist fouling. Trivalent metal plating provides superior protection against corrosion and seizing, supporting dependable service during maintenance and future removal.
These automotive spark plugs are designed as an upgrade from original-equipment nickel-alloy plugs and are compatible with select Lamborghini, Ducati, Honda, Kawasaki, KTM, Moto Guzzi, Suzuki, and Yamaha applications. Confirm vehicle compatibility and engine requirements before installation. For an additional performance upgrade, consider NGK Ruthenium HX spark plugs where application-specific fitment permits.

• Recommended usage: Modified or high-performance applications, or as an upgrade to OE nickel-alloy spark plugs


• Iridium fine-wire center electrode delivers consistent ignition performance and durability


• Tapered-cut ground electrode supports improved starting, idling, throttle response, and anti-fouling performance


• Trivalent metal plating helps resist corrosion and seizing


• Box includes four NGK Iridium IX DR9EIX spark plugs

Features:

• Recommended usage: Modified or high-performance applications, or as an upgrade to OE nickel-alloy spark plugs

• Ignition performance: Fine iridium tip provides a durable and consistent spark

• Engine response: Tapered-cut ground electrode supports improved starting, idling, and throttle response

• Durability: Iridium alloy withstands high operating temperatures and demanding engine conditions

• Protection: Trivalent metal plating helps resist corrosion and seizing

• Package contents: Four NGK Iridium IX DR9EIX spark plugs

Fitment:
Ducati 888 Strada Base 1992
Honda CB900C Custom Base 1980
Honda CB900C Custom Base 1981
Honda CB900F Super Sport Base 1981
Kawasaki EN450A 454 Ltd Base 1985
Kawasaki EN450A 454 Ltd Base 1986
Kawasaki EN450A 454 Ltd Base 1988
Kawasaki EN450A 454 Ltd Base 1989
Kawasaki EN450A 454 Ltd Base 1990
Kawasaki EN500 Vulcan 500 Base 1990
Kawasaki EN500 Vulcan 500 Base 1991
Kawasaki EN500 Vulcan 500 Base 1992
Kawasaki EN500 Vulcan 500 Base 1993
Kawasaki EN500 Vulcan 500 Base 1994
Kawasaki EN500 Vulcan 500 Base 1995
Kawasaki EN500 Vulcan 500 Base 1996
Kawasaki EN500C Vulcan 500 Ltd Base 1996
Kawasaki EN500C Vulcan 500 Ltd Base 1997
Kawasaki EN500C Vulcan 500 Ltd Base 1998
Kawasaki EN500C Vulcan 500 Ltd Base 1999
Kawasaki EN500C Vulcan 500 Ltd Base 2000
Kawasaki EN500C Vulcan 500 Ltd Base 2001
Kawasaki EN500C Vulcan 500 Ltd Base 2002
Kawasaki EN500C Vulcan 500 Ltd Base 2003
Kawasaki EN500C Vulcan 500 Ltd Base 2004
Kawasaki EN500C Vulcan 500 Ltd Base 2005
Kawasaki EN500C Vulcan 500 Ltd Base 2006
Kawasaki EN500C Vulcan 500 Ltd Base 2007
Kawasaki EN500C Vulcan 500 Ltd Base 2008
Kawasaki EN500C Vulcan 500 Ltd Base 2009
Kawasaki EX500 Ninja 500 Base 1994
Kawasaki EX500 Ninja 500 Base 1995
Kawasaki EX500 Ninja 500 Base 1996
Kawasaki EX500 Ninja 500R Base 1997
Kawasaki EX500 Ninja 500R Base 1998
Kawasaki EX500 Ninja 500R Base 1999
Kawasaki EX500 Ninja 500R Base 2000
Kawasaki EX500 Ninja 500R Base 2001
Kawasaki EX500 Ninja 500R Base 2002
Kawasaki EX500 Ninja 500R Base 2003
Kawasaki EX500 Ninja 500R Base 2004
Kawasaki EX500 Ninja 500R Base 2005
Kawasaki EX500 Ninja 500R Base 2006
Kawasaki EX500 Ninja 500R Base 2007
Kawasaki EX500 Ninja 500R Base 2008
Kawasaki EX500 Ninja 500R Base 2009
Kawasaki KZ305 CSR Base 1981
Kawasaki KZ305 CSR Base 1982
Kawasaki KZ305B CSR Belt Base 1982
Kawasaki KZ305B Ltd Base 1987
Kawasaki KZ305B Ltd Base 1988
Kawasaki ZL600 Eliminator Base 1986
Kawasaki ZL600 Eliminator Base 1987
Kawasaki ZR550 Zephyr Base 1990
Kawasaki ZR550 Zephyr Base 1991
Kawasaki ZR750C Zephyr Base 1991
Kawasaki ZR750C Zephyr Base 1992
Kawasaki ZX600 Ninja 600R Base 1985
Kawasaki ZX600 Ninja 600R Base 1986
Kawasaki ZX600 Ninja 600R Base 1987
Kawasaki ZX600 Ninja 600R Base 1988
Kawasaki ZX600 Ninja 600R Base 1989
Kawasaki ZX600 Ninja 600R Base 1990
Kawasaki ZX600 Ninja 600R Base 1991
Kawasaki ZX600 Ninja 600R Base 1992
Kawasaki ZX600 Ninja 600R Base 1993
Kawasaki ZX600 Ninja 600R Base 1994
Kawasaki ZX600 Ninja 600R Base 1995
Kawasaki ZX600 Ninja 600R Base 1996
Kawasaki ZX600 Ninja 600R Base 1997
Kawasaki ZX600 Ninja ZX-6 Base 1990
Kawasaki ZX600 Ninja ZX-6 Base 1991
Kawasaki ZX600 Ninja ZX-6 Base 1992
Kawasaki ZX600 Ninja ZX-6 Base 1993
Kawasaki ZX600 Ninja ZX-6 Base 1994
Kawasaki ZX600 Ninja ZX-6 Base 1995
Kawasaki ZX600 Ninja ZX-6 Base 1996
Kawasaki ZX600 Ninja ZX-6 Base 1997
Kawasaki ZX600 Ninja ZX-6R Base 1995
Kawasaki ZX600 Ninja ZX-6R Base 1996
Kawasaki ZX600 Ninja ZX-6R Base 1997
KTM 660 Rally Base 2003
KTM 660 Rally Base 2004
Lamborghini Diablo Base 1992
Lamborghini Diablo Base 1993
Lamborghini Diablo SE30 1994
Lamborghini Diablo VT 1994
Lamborghini Diablo VT 1995
Lamborghini Diablo VT 1996
Moto Guzzi V10 Centauro Gt Base 1998
Moto Guzzi V10 Centauro Sport Base 1998
Suzuki GS250T Base 1980
Suzuki GS250T Base 1981
Suzuki GS300L Base 1982
Suzuki GS300L Base 1983
Suzuki GS550E Base 1983
Suzuki GS550E Base 1984
Suzuki GS550E Base 1985
Suzuki GS550E Base 1986
Suzuki GS550ES Base 1983
Suzuki GS550ES Base 1984
Suzuki GS550ES Base 1985
Suzuki GS550ES Base 1986
Suzuki GS550L Base 1983
Suzuki GS550L Base 1984
Suzuki GS550L Base 1985
Suzuki GS550L Base 1986
Suzuki GSF1200S Bandit Base 1997
Suzuki GSF1200S Bandit Base 1998
Suzuki GSF1200S Bandit Base 1999
Suzuki GSF1200S Bandit Base 2000
Suzuki GSF1200S Bandit Base 2001
Suzuki GSF1200S Bandit Base 2002
Suzuki GSF1200S Bandit Base 2003
Suzuki GSF1200S Bandit Base 2004
Suzuki GSF1200S Bandit Base 2005
Suzuki GSX-R1100 Base 1989
Suzuki GSX-R1100 Base 1990
Suzuki GSX-R1100 Base 1991
Suzuki GSX-R1100 Base 1992
Suzuki GSX-R750 Base 1986
Suzuki GSX-R750 Base 1987
Suzuki GSX1100F Katana Base 1988
Suzuki GSX1100F Katana Base 1989
Suzuki GSX1100F Katana Base 1990
Suzuki GSX1100F Katana Base 1991
Suzuki GSX1100F Katana Base 1992
Suzuki GSX1100F Katana Base 1993
Suzuki GSX1100G Base 1991
Suzuki GSX1100G Base 1992
Suzuki GSX1100G Base 1993
Suzuki XN85 Turbo Base 1983
Yamaha TX500 Base 1973
Yamaha TX500 Base 1974