Skip to Product Info
    • Photo - Primary
    • Photo - out of package

    NGK Iridium Premium Spark Plug Box of 4 (BR9EIX)

    Vendor: NGK
    SKU: NGK3981
    Regular Price $37.60
    Fast Fulfillment: In-stock parts typically ship same day or next business day.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    Professional, Enthusiast-Driven Customer Support
    International Shipping Available - Contact Us!
    Payment & Security

    Payments are processed through secure, encrypted payment systems. Your credit card information is transmitted directly to the payment processor and is never stored or accessible by us.

    • Amazon
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Venmo
    • Visa

    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.

    • 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

    This Part Fits:

    Year Make Model Submodel
    2002-2005 Aprilia RS 50 Base
    1986-1988 Arctic Cat Cheetah 500 F/C Base
    1988-1991 Arctic Cat Cheetah Touring Base
    1985-1990 Arctic Cat Cougar Base
    1989-1990 Arctic Cat Cougar Mountain Cat Base
    1985 Arctic Cat Cougar SE Base
    1974 Arctic Cat El Tigre 295 Base
    1977,1987-1988 Arctic Cat El Tigre 5000 Base
    1981 Arctic Cat El Tigre 5000 F/C Base
    1986 Arctic Cat Jag Base
    1981 Arctic Cat Jag 4000 Base
    1987-1988 Arctic Cat Jag 440 Base
    1989-1990 Arctic Cat Jag AFS Base
    1992-1993 Arctic Cat Lynx Mountain Cat Base
    1979-1981,1985-1991 Arctic Cat Pantera Base
    1978 Arctic Cat Pantera 5000 F/A Base
    1978 Arctic Cat Pantera 5000 F/C Base
    1980-1981 Arctic Cat Pantera ES (Electric Start) Base
    1979-1981,1984-1990 Arctic Cat Panther Base
    1977-1978 Arctic Cat Panther 4000 Base
    1973 Arctic Cat Panther 440 Base
    1990 Arctic Cat Panther Mountain Cat Base
    1981 Arctic Cat Panther West Base
    1997 Arctic Cat Powder Extreme Base
    1994-1997 Arctic Cat Puma Base
    1994-1997 Arctic Cat Puma 2-Up Base
    1973 Arctic Cat Puma 440 Base
    1994-1997 Arctic Cat Puma Deluxe Base
    1987-1990 Arctic Cat Super Jag Base
    1980-1981 Arctic Cat Trail Cat 400 Base
    1990 Arctic Cat Wildcat 650 Base
    1990 Arctic Cat Wildcat Mountain Cat Base
    1977 Arctic Cat Z 250 Base
    1977-1979 Bultaco Pursang 250 Base
    1977 Can-Am 175 MX-3 Base
    1980 Can-Am 400 MX-6 Base
    2012-2018 Cobra CX65 Base
    1998-1999 Cobra KING Base
    2010 Gas Gas EC 125 Base
    2001 Gas Gas EC Rookie 50 Base
    2004 Gas Gas SM 50 Base
    1976-1977 Harley-Davidson SS125 Base
    1976-1977 Harley-Davidson SS175 Base
    1975-1977 Harley-Davidson SS250 Base
    1974-1975 Harley-Davidson SX175 Base
    1976-1977 Harley-Davidson SXT125 Base
    1984-1986 Honda ATC250R Base
    1999-2007 Honda CR125R Base
    1973-1976 Honda CR250M Base
    1978-1981,1987-1988 Honda CR250R Base
    1983-1984 Honda CR60R Base
    1980-1985 Honda CR80R Base
    1982-1984 Honda FL250 Odyssey Base
    2004 Honda NSR50 Base
    1987-1988 Honda TRX250R Base
    1998-2006,2009-2010,2012 Husqvarna CR125 Base
    2010 Husqvarna SM 125 Base
    1991 Husqvarna WME 250 Base
    1998-2006,2009-2012 Husqvarna WR125 Base
    2010 Husqvarna WRE 125 Base
    1992-1993,1996-1997 Husqvarna WXC 250 Base
    1990-1991,1994-1997 Husqvarna WXE 250 Base
    1991 Husqvarna WXE 260 Base
    1982-1986 Husqvarna XC125 Base
    1981-1982 John Deere Liquifire 440 Base
    1981-1982 John Deere Sportfire Base
    1981-1982 John Deere Trailfire 440 Base
    1980-1982 Kawasaki KDX175 Base
    1983-1996 Kawasaki KDX200 Base
    1984,1991-1994 Kawasaki KDX250 Base
    1984 Kawasaki KDX80 Base
    1982 Kawasaki KE125 Base
    1974-1976,1978-1982,1994-2002 Kawasaki KX125 Base
    1974-1976,1978-1982,1986-1987,1989-1991 Kawasaki KX250 Base
    1975-1976 Kawasaki KX400 Base
    1980-1981 Kawasaki KX420 Base
    1983-1984 Kawasaki KX500 Base
    1983-2001 Kawasaki KX60 Base
    1980-1991 Kawasaki KX80 Base
    1987-1991 Kawasaki KX80 Big Wheel Base
    1983-1985 Kawasaki ZX750 GPZ Base
    1984-1985 Kawasaki ZX750E Turbo Base
    2007 KTM 105 SX Base
    1993 KTM 125 EXC Base
    1997-1998 KTM 125 Sting Base
    2003-2004 KTM 200 SX Base
    1990-1995 KTM 250 EXC Base
    1984-1988 KTM 250 MXC Base
    1992-1995 KTM 250 SX Base
    1990-1992 KTM 300 DXC Base
    1990-1995 KTM 300 EXC Base
    1990,1993-1994 KTM 300 MXC Base
    1992 KTM 300 SX Base
    1989-1990 KTM 350 EXC Base
    1985-1988 KTM 350 MXC Base
    1985-1986 KTM 500 MXC Base
    1992 KTM 500 SX Base
    1993-1994 KTM 550 MXC Base
    2007 KTM 85 SX (17/14) Base
    2007 KTM 85 SX (19/16) Base
    2008 KTM 85 XC Base
    1999-2006 LEM LX4 Base
    2007 Piaggio Typhoon Base
    2006-2010 Polini X1R Base
    2006-2010 Polini X3P Air Base
    2006-2010 Polini X3R Base
    2006-2010 Polini X5P Air Base
    2007-2010 Polini X5P Liquid Base
    2010 Polini XP65R Base
    1971 Sno-Jet S/S Jet 292 Base
    1971 Sno-Jet S/S Jet 338 Base
    1971 Sno-Jet S/S Jet 433 Base
    1972 Sno-Jet SST 292 Base
    1972 Sno-Jet SST 338 Base
    1973-1974 Sno-Jet SST 340 Base
    1972 Sno-Jet SST 433 Base
    1973-1976 Sno-Jet SST 440 Base
    1975-1976 Sno-Jet SST F/A 340 Base
    1975-1976 Sno-Jet SST F/A 440 Base
    1972 Sno-Jet Star-Jet +2 338 Base
    1970-1972 Sno-Jet Star-Jet 292 Hirth Base
    1971,1973 Sno-Jet Star-Jet 338 Base
    1973 Sno-Jet Star-Jet 433 Base
    1970 Sno-Jet Super-Jet 338 Base
    1972 Sno-Jet Super-Jet 433 Base
    1976-1977 Suzuki GT250 Base
    1985-1992 Suzuki LT250R QuadRacer Base
    1978 Suzuki PE175 Base
    1980 Suzuki PE250 Base
    1980-1981 Suzuki PE400 Base
    1976-1981 Suzuki RM100 Base
    1975-1980,1982-1995 Suzuki RM125 Base
    1976-1981 Suzuki RM250 Base
    1976-1977 Suzuki RM370 Base
    1982 Suzuki RM465 Base
    2003 Suzuki RM60 Base
    1982,1984-1985 Suzuki RM80 Base
    1993-1998 Suzuki RMX250 Base
    1981 Suzuki RS250 Base
    1995-2003 TM 125E Base
    1995-2003 TM 250E Base
    1996-2003 TM 300E Base
    1995-2000 TM 80E Base
    2009 TM EN125 Base
    2009 TM EN144 Base
    1995-2003,2009-2012 TM MX125 Base
    2009,2011 TM MX144 Base
    1995-2003,2011-2012 TM MX250 Base
    1998-2003,2011-2012 TM MX300 Base
    1995-2000 TM MX80 Base
    2009 TM MX85 (17/14) Base
    2009 TM MX85 (19/16) Base
    2009 TM SMM125 Base
    2009 TM SMR125 Base
    2001 Vespa ET2 Base
    1969-1971 Yamaha AT1 Base
    1970-1971 Yamaha AT1M Base
    1972 Yamaha AT2M Base
    1980-1981 Yamaha DT175 Base
    1974 Yamaha DT360 Base
    1975-1976 Yamaha DT400 Base
    1972-1973 Yamaha EW643 Base
    1976-1978 Yamaha EX340 Base
    1976-1981 Yamaha EX440 Base
    1973-1974 Yamaha GP292 Base
    1974-1975 Yamaha GPX338 Base
    1974-1975 Yamaha GPX433 Base
    1980-1981 Yamaha IT125 Base
    1979-1983 Yamaha IT175 Base
    1984-1985 Yamaha IT200 Base
    1977-1983 Yamaha IT250 Base
    1974-1976 Yamaha MX125 Base
    1975 Yamaha MX400 Base
    1970-1971 Yamaha RT1 Base
    1972-1973 Yamaha RT2 Base
    1973 Yamaha RT3 Base
    1973,1978 Yamaha SR433 Base
    1973,1975 Yamaha SR643 Base
    1976-1980 Yamaha SRX440 Base
    1969 Yamaha SS338 Base
    1971 Yamaha SS433 Base
    1976 Yamaha TY175 Base
    1992 Yamaha WR200 Base
    1982 Yamaha YZ100 Base
    1974-1976,1982-2017 Yamaha YZ125 Base
    1974-1982,1984-1987 Yamaha YZ250 Base
    1980 Yamaha YZ50 Base
    1981-1983 Yamaha YZ60 Base
    1982-1983 Yamaha YZ80 Base
    Shipping Policy

    Shipping Policy Last Updated: April 2026

    We're committed to getting your order to you as quickly and transparently as possible. Here's everything you need to know about how we ship.

    Order Cancellations

    Once an order is placed, cancellations are not guaranteed as orders are sent to fulfillment quickly. If you need to cancel, contact us immediately at sales@berryperformancesales.com. If a cancellation is possible, the buyer is responsible for any transaction fees incurred. If the order has already shipped, it cannot be cancelled and must go through our standard return process.

    Processing Time

    In-stock orders are typically processed and shipped within 1–2 business days of receiving payment, unless otherwise noted on the product page. Orders placed on weekends or holidays will be processed on the next business day.

    Shipping Costs

    Shipping costs are calculated at checkout based on the shipping method selected, package weight and dimensions, and destination address. You can review all shipping costs before finalizing your purchase.

    Estimated Delivery Times

    Domestic orders typically arrive within 1–7 business days after shipment, depending on your location and the carrier. Please note that delivery times are estimates and are not guaranteed. Delays due to weather, carrier volume, or other circumstances beyond our control may occur.

    Tracking Information

    Once your order ships, you will receive a confirmation email with tracking information. Use this to monitor your package's progress. If your tracking has not updated within 48 hours of receiving your confirmation email, please contact us and we'll look into it.

    Shipping Address

    Please ensure your shipping address is accurate and complete before placing your order. If you realize an error after ordering, contact us immediately at sales@berryperformancesales.com — we will do our best to make the correction, but changes cannot be guaranteed once an order is in fulfillment. We are not responsible for orders shipped to incorrect or undeliverable addresses due to customer error.

    Please note: We are unable to ship to P.O. Boxes. Please provide a physical delivery address at checkout.

    Lost or Stolen Packages

    If your tracking shows your order as delivered but you have not received it, please take the following steps:

    • Check around your property and with neighbors
    • Confirm the shipping address on your order was correct
    • Contact the carrier directly with your tracking number

    If the issue remains unresolved, contact us at sales@berryperformancesales.com within 5 business days of the marked delivery date. We will work with you and the carrier to investigate. Berry Performance Sales is not responsible for packages confirmed as delivered by the carrier or for packages stolen after delivery.

    Damaged in Transit

    If your order arrives visibly damaged, please refer to our Returns & Refunds policy for instructions on how to report the issue. Carrier damage claims must be reported within 48 hours of delivery.

    International Shipping

    We do ship internationally! Because shipping costs, carrier options, and transit times vary significantly by destination, international orders require a custom quote prior to purchase. To request a shipping quote, contact us at sales@berryperformancesales.com with the following:

    • Your country and full delivery address
    • The item(s) you are interested in ordering

    We will respond with a shipping quote as quickly as possible. Please note that customs duties, import taxes, and any other fees charged upon delivery are the sole responsibility of the recipient and are not included in your shipping quote. We recommend checking with your local customs office before placing your order.

    Off-Road Use Disclaimer

    All products are sold for off-road use only unless otherwise specified. The buyer assumes full responsibility for installation and operation. Berry Performance Sales is not liable for any incidental, indirect, or consequential damages including engine failure, labor charges, or vehicle downtime resulting from the use of any product sold. By placing an order, you acknowledge and accept these terms.

    Questions?

    We're happy to help before, during, or after your purchase. Email: sales@berryperformancesales.com

    Berry Performance Sales reserves the right to update this policy at any time. Changes take effect immediately upon posting. It is the customer's responsibility to review the current policy at the time of purchase.

    Return Policy

    Returns & Refunds Last Updated: April 2026

    We want you to love what you ordered. If something isn't right, here's everything you need to know.

    30-Day Return Window

    You have 30 days from the date of purchase to initiate a return. After this window, we are unable to accept returns. We do not offer exchanges — all approved returns are refunded per the terms below.

    How to Initiate a Return

    To request a return, contact us at sales@berryperformancesales.com with your order number and reason for return. All returns must be approved by our team before any item is shipped back to us. Once your return has been approved, your item must be shipped within 10 days of approval. Items shipped without prior approval or outside this window will be refused and returned to sender.

    Return Conditions

    To be eligible for a return, items must be:

    • Unused and in original condition
    • In original packaging
    • Inclusive of all parts and accessories

    Custom ordered products are non-returnable. If you're unsure whether your item qualifies, contact us before purchasing.

    Once we receive your return, we will inspect the item before processing any refund. We reserve the right to deny or adjust your refund if the item is received in a condition that differs from what was originally shipped — including signs of use, missing parts, or damage that occurred after delivery.

    Fees to Know Upfront

    We believe in being transparent about costs:

    • Restocking Fee: 20% — deducted from all return refunds
    • Return Shipping: Buyer's responsibility on all standard returns
    • Cancellation (Installment/Payment Plan): 7% fee to cover transaction costs
    • Cancellation (Credit Card/PayPal): 3.5% processing fee

    Damaged or Defective Items

    If your order arrives damaged or defective, you must contact us within 48 hours of delivery at sales@berryperformancesales.com. Claims reported outside this window may not be eligible for resolution.

    When contacting us, please include:

    • Your order number
    • A description of the issue
    • Clear photos or video of the damage or defect

    If your item was damaged during shipping, this is handled as a carrier claim separate from our standard return process — we will assist you in filing that claim. Items confirmed to be defective due to a manufacturing or fulfillment error will have return shipping costs covered by Berry Performance Sales.

    Refunds

    Once we receive and inspect your return, refunds are processed within 3–5 business days back to your original payment method. You'll receive a confirmation once it's been issued.

    Questions?

    We're happy to help before, during, or after your purchase. Email: sales@berryperformancesales.com

    Berry Performance Sales reserves the right to update this policy at any time. Changes take effect immediately upon posting. It is the customer's responsibility to review the current policy at the time of purchase.

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

    Recently Viewed