Honda 400EX - Dune Goons

Honda 400EX Parts & Accessories

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    Honda 400EX (1999–2009) Parts – The Legend Lives On

    The Honda 400EX is one of the most beloved sport quads ever built. Light, reliable, and packing a peppy 397 cc air-cooled engine with roughly 28 horsepower, it ruled trails and dunes for over a decade — and it’s still a favorite today.

    Whether you’re refreshing a classic, building a dune weapon, or keeping the family 400EX running strong, we stock everything you need:

    • Full plastics kits & graphics
    • Nerf bars, bumpers & grab bars
    • Big-bore kits, cams & top-end rebuilds
    • Exhaust systems, carb kits & jetting
    • A-arms, swingarms & suspension upgrades
    • Wheels, tires, paddles & beadlocks
    • Maintenance parts – oils, filters, chains & sprockets

    Every part is rider-tested by the Dune Goons crew. Orders before 2 PM PST ship same day.

    Keep the 400EX legacy alive — shop now!

    Modquad Billet Thumb Throttle Lever – Fits YFZ450R, Raptor, 400EX, 250R - Dune Goons
    Modquad Billet Thumb Throttle Lever – Fits YFZ450R, Raptor, 400EX, 250R - Dune Goons
    Modquad Billet Thumb Throttle Lever – Fits YFZ450R, Raptor, 400EX, 250R
    $46.95
    Brake Cover - Billet - Modquad - Dune Goons
    Brake Cover - Billet - Modquad - Dune Goons
    Brake Cover - Billet - Modquad
    from $22.95
    Wiseco WPC131 Bottom End Kit – Honda TRX400EX 1999–2004 - Dune Goons
    Wiseco WPC131 Bottom End Kit – Honda TRX400EX 1999–2004
    $584.95
    Yamaha Raptor 700 Parking Brake Blockoff Plate - Billet - Modquad - Dune Goons
    Yamaha Raptor 700 Parking Brake Blockoff Plate - Billet - Modquad
    $15.95
    Honda TRX 400EX/400X 85mm Cometic Top End Gasket Kit - Dune Goons
    Honda TRX 400EX/400X 85mm Cometic Top End Gasket Kit - Dune Goons
    Honda TRX 400EX/400X 85mm Cometic Top End Gasket Kit
    $98.95
    Honda 400EX 400X Wiseco Engine Rebuild Kit – 85mm Cylinder - Dune Goons
    Honda 400EX 400X Wiseco Engine Rebuild Kit – 85mm Cylinder - Dune Goons
    Honda 400EX 400X Wiseco Engine Rebuild Kit – 85mm Cylinder
    $849.00
    Light Whip Quick Disconnect Mount - Modquad - Dune Goons
    Light Whip Quick Disconnect Mount - Modquad - Dune Goons
    Light Whip Quick Disconnect Mount - Modquad
    $38.95
    Honda TRX400EX Kits | BILLETRON™ PRO BIG AIR - Dune Goons
    Honda TRX400EX Kits | BILLETRON™ PRO BIG AIR
    $899.00
    Honda TRX400EX Nickel Finish Restoration Bolt Kit (1999–2008) - Dune Goons
    Honda TRX400EX Nickel Finish Restoration Bolt Kit (1999–2008) - Dune Goons
    Honda TRX400EX Nickel Finish Restoration Bolt Kit (1999–2008)
    $210.00
    ProX Clutch Inner Hub – Honda TRX400EX / TRX400X (1999–2009) - Dune Goons
    ProX Clutch Inner Hub – Honda TRX400EX / TRX400X (1999–2009)
    $74.95
    Elka Stage 3 Front Shocks – Honda TRX400EX (1990–2021) - Dune Goons
    Elka Stage 3 Front Shocks – Honda TRX400EX (1990–2021) - Dune Goons
    Elka Stage 3 Front Shocks – Honda TRX400EX (1990–2021)
    $1,350.00
    Honda 400EX Front Suspension Bolt Kit – A - Arm & Shock Hardware Replacement - Dune Goons
    Honda 400EX Front Suspension Bolt Kit – A-Arm & Shock Hardware Replacement
    $46.00
    Complete Clutch Kit – Honda TRX400EX (1999–2005) - Dune Goons
    Complete Clutch Kit – Honda TRX400EX (1999–2005) - Dune Goons
    Complete Clutch Kit – Honda TRX400EX (1999–2005)
    $473.63
    Honda TRX 400EX/400X Kibblewhite Heavy Duty Head Stud Kit - Dune Goons
    Honda TRX 400EX/400X Kibblewhite Heavy Duty Head Stud Kit
    $87.89
    Customizable Options
    Honda - TRX400EX Extended ATV A - arms - Dune Goons
    Honda - TRX400EX Extended ATV A - arms - Dune Goons
    Honda - TRX400EX Extended ATV A-arms
    $702.00 $556.00
    DWT A5 Front Wheel 10x5 4+1 4/144 Polished | TRX400EX / LT - Z400 / KFX / DVX / DS450 - Dune Goons
    DWT A5 Front Wheel 10x5 4+1 4/144 Polished | TRX400EX / LT-Z400 / KFX / DVX / DS450
    $92.95
    FOX FLOAT 3 Front Shocks Honda TRX400EX TRX400X – Black - Dune Goons
    FOX FLOAT 3 Front Shocks Honda TRX400EX TRX400X – Black
    $799.99
    Wiseco 85.50mm Top End Kit Honda TRX400EX TRX400X XR400R - Dune Goons
    Wiseco 85.50mm Top End Kit Honda TRX400EX TRX400X XR400R
    $294.95
    Empire Cyclone Exhaust – Honda TRX 400EX - Dune Goons
    Empire Cyclone Exhaust – Honda TRX 400EX
    $799.00