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Due to Thanksgiving and the holiday rush, our current handling time is approximately 4–5 business days. We sincerely appreciate your patience and understanding. We truly appreciate your business and are thankful for another great year serving our customers. If you have any questions or concerns, please contact us—our team is working as hard as possible to ship all orders promptly.
Due to Thanksgiving and the holiday rush, our current handling time is approximately 4–5 business days. We sincerely appreciate your patience and understanding. We truly appreciate your business and are thankful for another great year serving our customers. If you have any questions or concerns, please contact us—our team is working as hard as possible to ship all orders promptly.

Honda TRX400EX

Honda 400EX Rebuild Kits, Pistons, and Parts

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$581.79
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$324.88

Honda TRX400EX 400EX 400X XR400 89mm 440 JE Cometic 10.8:1 Cylinder Big Bore Kit

JE Pistons

247612, 4667M08900, 4794M08900,1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY...

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$436.78
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$436.78
$304.88
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$304.88

TRX400EX 400EX 400X 87mm Big Bore Cylinder JE Piston Cometic Top End Rebuild Kit

JE Pistons

1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-...

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$257.75
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$257.75
$184.88
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$184.88

Honda TRX 400EX 400X 85mm Stock Bore 10:1 Piston Cometic MLS Top End Gasket Kit

Wiseco

12100-KCY-670, 4606M08500, C7825, 12191-KCY-673, 13011-KCY-670, 90601-KA5-000, 13103-KCY-670, 13111-KCY-670, 12251-HN1-003, PK1031Brand New Wiseco ...

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$184.88
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$184.88
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$43.98
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$43.98
$31.19
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$31.19

99-14 Honda 400EX 400X BPRATV Stronger Heavy Duty Exhaust Head Pipe Studs Bolts

BPRATV Talon Titanium

92900-08022-0B, 90301-HM8-000, 18291-MN5-650Give your Honda 400EX 400X XR400R a performance upgrade with this complete exhaust stud kit that boosts...

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$43.98
$31.19
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$39.99
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$29.98
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$29.98

SKF Cam Bearings For Honda TRX 400EX TRX 400X XR400 91003-KF0-008 91002-MN1-671

SKF

WORKS ON ALL HONDA 400EX 400X AND XR400R MODELS AND YEARSSKF OEM Upgrade Aftermarket Camshaft Bearing SetBearing Made in Germany / FranceReplaces H...

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$44.99
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$34.99
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$34.99

Honda 400EX XR400 87mm 416cc Big Bore Wiseco Replacement Piston Rings Set 3425XC

Wiseco

Honda 400EX / 400X / XR400 87mm Wiseco Big Bore Piston Replacement Rings KitPart# 3425XCThese rings are for Wiseco Piston Part #'s 4606M08700, 4628...

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$34.99
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$79.95
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$79.95
$71.99
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$71.99

Wiseco OEM Extreme Heavy Duty Timing Cam Chain Honda TRX400EX TRX 400EX 400X JPN

Wiseco

HC82RH2010112,CC004,14401-KCY-671,31.1496,SCA0409SV112Wiseco, Direct OEM Replacement Cam Chain, XR400R ’96-04 / TRX400EX / X ’99-14 A critical comp...

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$71.99
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$663.95
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$663.95
$509.98
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$509.98

Hot Rods Complete Bottom End Rebuild Kit for 05+ Honda TRX400EX 400EX XR400 400X

Hot Rods

Hot Rods OEM Replacement Complete Bottom End Kit Rebuild KitFits Honda 2005-2008 Sportrax 400EX & 2009-2014 TRX 400X ModelsHot Rods Bottom End ...

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$663.95
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$663.95
$509.98
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$509.98
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$449.99
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$394.98
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$394.98

TRX 400EX 400 400X Kibblewhite +1 Valves Springs Complete Valve Head Rebuild Kit

Kibblewhite Precision

30-3111, 30-3116, 30-3118, 30-3120,30-3111, 30-3116, 30-3118, 30-3120, 14711-KCY-670, 14721-KCY-670 14411-KCY-670, 14421-KCY-670 14431-KCY-670, 144...

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$394.98
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$394.98
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$97.66
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$84.07
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$84.07

Kibblewhite Honda TRX 400EX 400X Stronger Heavy Duty Cylinder Head Studs Kit

Kibblewhite Precision

Brand New Kibblewhite Extreme Heavy Duty Head Stud KitHonda 400EX & 400X Years 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011...

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$97.66
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$84.07
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$584.95
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$449.99

1999-2004 Honda Sportrax TRX400EX Wiseco Crankshaft Bottom Rebuild Kit WPC131A

Wiseco

Wiseco, Crankshaft Kit, Honda TRX400EX ’99-04 Wiseco’s bottom-end rebuild kits help save time and money for your dirt bike, ATV, or UTV bottom-en...

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$449.99
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$1,264.95
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$1,264.95
$399.99
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$399.99

TRX400EX TRX 400EX Stage 1 Hotcam Hot Cam Valves Springs Chain Head Rebuild Kit

BPRATV

FITS ALL HONDA TRX400EX TRX400X AND XR400R YEARS AND MODELS   COMPLETE HEAD REBUILD KIT! Stage 1 Hotcam Cam bearings Rocker arms Rocker arm shafts...

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$1,264.95
$399.99
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$399.99
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$629.99
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$629.99
$430.49
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$430.49

TRX400EX TRX 400EX Stage 3 Hotcam Hot Cam Valves Springs Chain Head Rebuild Kit

Hot Cams

FITS ALL HONDA TRX400EX TRX400X AND XR400R YEARS AND MODELS   COMPLETE HEAD REBUILD KIT! Stage 3 Hotcam Cam bearings Rocker arms Rocker arm shaft...

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$629.99
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$430.49
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$430.49
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$599.99
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$595.00
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$595.00

TRX 400EX 400X Stage 2 Hot Cam Kibblewhite Valve Springs Head Rebuild Redo Kit

Kibblewhite Precision

FITS ALL HONDA 400EX 400X AND XR400R MODELS AND YEARS - THE ONLY TRULY COMPLETE REBUILD KIT ONLINE Stage 2 Hotcam SKF cam bearings Kibblewhite st...

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$599.99
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$595.00
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$124.99
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$124.99
$88.88
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$88.88

TRX 400EX 400X XR400 Ti Cylinder Case Studs 90085-KCY-670 TITANIUM Stud Bolt Kit

BPRATV

BPRATV - The Original Trailblazer for Titanium Hardware in the ATV Industry. FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARSTHESE STUDS ...

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$124.99
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$124.99
$88.88
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$88.88
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$999.99 - $999.99
$999.99
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$999.99

TRX 400EX 400X Port Ported Assembled Head Porting Assembly Valves

BPRATV

FITS ALL XR400R TRX400EX and TRX400X MODELS PHOTO IS NOT A STOCK IMAGE.  IT IS EXACTLY WHAT YOUR HEAD WILL LOOK LIKE.  THE PORTING IS EXACTLY THE ...

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$999.99
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$999.99
Save 92% Save %
$571.99
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$571.99
$44.99
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$44.99

Best TRX 400EX 400X Wheel Bearings Complete Left Right Front Hub Bearing Kit Set

SKF

FITS ALL HONDA TRX400EX AND 400X YEARS AND MODELS!  SKF set of 4 front wheel bearings Replacement for both left and right front hubs Better than O...

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$571.99
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$571.99
$44.99
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$44.99
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$1,688.22
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$1,688.22
$1,399.98
$1,399.98 - $1,399.98
$1,399.98

99-04 TRX400EX TRX 400EX 416 Big Bore Complete Motor Rebuild Valves Hotcams 87mm

BPRATV

4040, CBK0080,4606M08700, TBK0011,C7826, K014, 808894, 4628M08700, 1051-3, 30-3111, 30-3115, 30-3117,8604D200, 133889, M2001,WPC131A ,WPC131B, CBK0...

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$1,688.22
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$1,399.98
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$149.99
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$124.99
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$124.99

Get Honda 400EX Sportrax TITANIUM Head Studs 400X TI Cylinder Head Stud Bolt Kit

BPRATV

FITS ALL HONDA TRX400EX, 400X AND XR400R MODELS AND YEARS All Grade 5 Titanium Alloy cylinder head stud kit Allen head, heat treated studs 12 po...

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$149.99
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$149.99
$124.99
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$124.99
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$21.99
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$18.99
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$18.99

99+ Honda TRX400EX TRX 400EX 400X Head Valve Stem Guide Seals RED Seals Set of 4

Kibblewhite Precision

Complete Set of Kibblewhite Hi-Temp RED Viton Valve Stem Seals (4)Fits Honda TRX 400EX, 400X and XR400 ALL YEARS!Better then OEM for Less $$$!!Repl...

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$21.99
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$21.99
$18.99
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$18.99
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$46.80
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$46.80
$37.64
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$37.64

Honda TRX 400EX XR400 400X 416 440 Cometic Top End Gasket Kit C7826 89mm MLS USA

Cometic Gaskets

C7826, C7825, 12251-KCY-671, 12191-KCY-671, 91302-356-000, 18291-MN5-650, 14523-KBB-901, 91301-200-000, 91306-MG3-000, 91301-679-003, 18291-MN5-650...

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$46.80
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$46.80
$37.64
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$37.64
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$489.99
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$489.99
$318.88
$318.88 - $318.88
$318.88

Honda TRX 400EX 400X Top End Rebuild Kit 11:1 CP Piston Cometic Gaskets Cylinder

CP-Carrillo

400EX-CYL85 M2002 400EX-TEG DPR8Z, 810894, M2003,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 13011-KCY-670, 90601-KA5-000, 13103-KCY-...

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$489.99
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$489.99
$318.88
$318.88 - $318.88
$318.88
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$473.60
$473.60 - $473.60
$473.60
$378.88
$378.88 - $378.88
$378.88

TRX 400EX 400X 440 Big Bore 89mm Cylinder Hi-Performance Cam Top End Rebuild Kit

BPRATV

4667M08900, 1043-2, C7826, 1051-3, 12100-KCY-670, 71016-4, 13111-KCY-670, 4606M08500, C7826, 71016-4, 13111-KCY-670, 12251-HN1-003, 12209-KL4-005, ...

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$473.60
$473.60 - $473.60
$473.60
$378.88
$378.88 - $378.88
$378.88
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$436.78
$436.78 - $436.78
$436.78
$304.88
$304.88 - $304.88
$304.88

TRX400EX 400EX 400X XR400 87mm 87 416cc JE Cometic 10.8:1 Cylinder Big Bore Kit

JE Pistons

1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-...

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$436.78
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$436.78
$304.88
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$304.88
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$436.78
$436.78 - $436.78
$436.78
$304.88
$304.88 - $304.88
$304.88

TRX400EX 400EX 400X XR400 87mm Big Bore Cylinder JE Piston & Gaskets Rebuild Kit

JE Pistons

1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-...

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$436.78
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$436.78
$304.88
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$304.88
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$436.78
$436.78 - $436.78
$436.78
$399.98
$399.98 - $399.98
$399.98

TRX400EX 400EX 400X XR400 88mm Big Bore Cylinder JE Piston & Gaskets Rebuild Kit

JE Pistons

1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-...

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$436.78
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$436.78
$399.98
$399.98 - $399.98
$399.98
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$699.99
$699.99 - $699.99
$699.99
$599.99
$599.99 - $599.99
$599.99

TRX400EX TRX 400X XR400 87mm Big Bore 11:1 High Comp Piston Stage 2 Hot Cam Kit

BPRATV

Best Honda TRX400EX Big Bore Top End Rebuild Kit Online, 1043-2, M2008, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, ...

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$699.99
$699.99 - $699.99
$699.99
$599.99
$599.99 - $599.99
$599.99
Save 14% Save %
Save 40% Save %
$999.99
$999.99 - $999.99
$999.99
$599.98
$599.98 - $599.98
$599.98

BEST Honda TRX400EX TRX 400EX Complete ASSEMBLED Cylinder Head Kit 12200-KCY-670

BPRATV

>14711-KCY-670, 14721-KCY-670 14411-KCY-670, 14431-KCY-670, 14445-KF0-000 14446-KF0-000, 14751-KCY-670, 14761-KG0-003 14451-MBV-000, 14781-HA0-7...

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$999.99
$999.99 - $999.99
$999.99
$599.98
$599.98 - $599.98
$599.98
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$999.99
$999.99 - $999.99
$999.99
$599.98
$599.98 - $599.98
$599.98

99-08 Honda Sportrax 400 TRX400X TRX400EX Completely ASSEMBLED Cylinder Head Kit

BPRATV

>14711-KCY-670, 14721-KCY-670 14411-KCY-670, 14431-KCY-670, 14445-KF0-000 14446-KF0-000, 14751-KCY-670, 14761-KG0-003 14451-MBV-000, 14781-HA0-7...

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$999.99
$999.99 - $999.99
$999.99
$599.98
$599.98 - $599.98
$599.98
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$687.49
$687.49 - $687.49
$687.49
$489.99
$489.99 - $489.99
$489.99

Best 05+ TRX 400EX 400X Bottom End Rebuild Kit Crank Shaft Motor Engine Assembly

BPRATV

COMPLETE BOTTOM END REBUILF FOR HONDA TRX 400EX!Compatible with all 2005+ Honda 400EX and 400X models!A Great & Affordable Complete Bottom End ...

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$687.49
$687.49 - $687.49
$687.49
$489.99
$489.99 - $489.99
$489.99
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Save 27% Save %
$149.99
$149.99 - $149.99
$149.99
$109.99
$109.99 - $109.99
$109.99

400EX 400X TITANIUM Cylinder Head Studs Ti Stud 12 Point Nut Kit Set

BPRATV Talon Titanium

All Grade 5 Titanium alloy stud nut and washer kit Heat treated, allen head studs 12 point flange nuts 3mm washers As strong as, half the weight of...

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$149.99
$149.99 - $149.99
$149.99
$109.99
$109.99 - $109.99
$109.99
Save 27% Save %
Save 29% Save %
$43.98
$43.98 - $43.98
$43.98
$31.19
$31.19 - $31.19
$31.19

Honda 400EX 400X XR400R BPRATV Stronger Heavy Duty Exhaust Head Pipe Studs Bolts

BPRATV Talon Titanium

92900-08022-0B, 90301-HM8-000, 18291-MN5-650Give your Honda 400EX 400X XR400R a performance upgrade with this complete exhaust stud kit that boosts...

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$43.98
$43.98 - $43.98
$43.98
$31.19
$31.19 - $31.19
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Save 29% Save %
Save 5% Save %
$615.95
$615.95 - $615.95
$615.95
$583.91
$583.91 - $583.91
$583.91

99-04 Honda 400EX 400X Hot Rods Bottom End Crank Rod Rebuild Kit Gaskets Seals

Hot Rods

13000-MBV-730, 4040, 808829, 822139, K014, Hot Rods Wiseco, WPC131A,12191-KCY-673, 13011-KCY-670, 90601-KA5-000,13103-KCY-670, 13111-KCY-670, 12251...

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$615.95
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$615.95
$583.91
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Save 5% Save %
$615.95
$615.95 - $615.95
$615.95
$583.91
$583.91 - $583.91
$583.91

99-04 Honda TRX400EX 400EX Hot Rods Hotrods Bottom End Rebuild Kit Crank Gaskets

Hot Rods

13000-MBV-730, 4040, 808829, 822139, K014, Hot Rods Wiseco, WPC131A,12191-KCY-673, 13011-KCY-670, 90601-KA5-000,13103-KCY-670, 13111-KCY-670, 12251...

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$615.95
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$615.95
$583.91
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$469.99
$469.99 - $469.99
$469.99
$398.88
$398.88 - $398.88
$398.88

TRX 400EX TRX400EX 400X 88mm 88 426cc Big Bore Cylinder 10:1 Top End Rebuild Kit

BPRATV

1043-2, M2008, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-...

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$469.99
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$469.99
$398.88
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$398.88
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Save 15% Save %
$99.99
$99.99 - $99.99
$99.99
$84.99
$84.99 - $84.99
$84.99

Honda 400EX 85mm Stock Bore WISECO Piston Rings Set & Cometic Top End Gasket Kit

Wiseco

C7825, XC8500, 3347XC,4606M08500, 4628M08500, C7825, XC8500, 3347XC,4606M08500, 4628M08500, 12251-KCY-671, H0401027S, 12191-KCY-671, 91302-356-000,...

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$99.99
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$99.99
$84.99
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$84.99
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$34.99
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$34.99
$29.74
$29.74 - $29.74
$29.74

400EX 400X Valve Spring Seats Base Washers Steel Copper Wave Washer Head Rebuild

BPRATV

WORKS ON ALL HONDA 400EX 400X AND XR400R MODELS AND YEARS!If you bought a so-called "complete" head rebuild kit online unless it was from us it is ...

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$34.99
$34.99 - $34.99
$34.99
$29.74
$29.74 - $29.74
$29.74
Save 15% Save %
Save 10% Save %
$133.78
$133.78 - $133.78
$133.78
$119.89
$119.89 - $119.89
$119.89

Honda 400EX 400X XR400 ProX Valve Rebuild Kit Valves Set KIBBLEWHITE Red Seals

Pro-X

28.1495-2, 28.1495-1,14711-KCY-670,14721-KCY-670,12209-KL4-005,30-3115,30-3117,8400003-2, 8400003-1,VES003,VIS003,X2VEK16000,X2VIK16000Is your Hond...

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$133.78
$133.78 - $133.78
$133.78
$119.89
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$119.89
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$34.42
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$34.42
$30.98
$30.98 - $30.98
$30.98

TRX 400EX 400X Sportrax 87mm 89mm Big Bore Head Gasket Cometic +4 Cylinder Top

Cometic Gaskets

Honda TRX400EX/TRX400X/XR400R .027" MLS Cylinder Head Gasket, 89mm BorePART NO: H0402027SUPC NO: 191070068875Material: MLSCompressed Thickness: .02...

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$34.42
$30.98
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$30.98
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Save 33% Save %
$29.99
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$29.99
$19.99
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$19.99

Honda Sportrax TRX400EX 400EX 400X DPR8Z Spark Plug NGK 4 Pack Replaces OEM Plug

NGK

Unleash the power of your Honda Sportrax 400EX with these premium NGK spark plugs. Engineered for maximum performance and longevity, this 4-pack of...

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$29.99
$19.99
$19.99 - $19.99
$19.99
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$281.46
$281.46 - $281.46
$281.46
$208.89
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$208.89

Honda 400EX 400X Wiseco 85mm Stock Bore 11:1 Piston COMETIC Top End Gasket Kit

Wiseco

Wiseco 85mm Stock Bore 11:1 Compression Piston & Cometic Top End Gasket KitFits Honda TRX 400EX & 400XYears 1999 2000 2001 2002 2003 2004 2...

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$208.89
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$208.89
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$119.99
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$119.99
$99.98
$99.98 - $99.98
$99.98

05-14 TRX400EX TRX 400EX TITANIUM Cylinder Head Valve Cover Bolt Kit Ti Bolts

BPRATV Talon Titanium

BPRATV - The Original Trailblazer for Titanium Hardware in the ATV Industry. Fits Honda TRX 400EX 400X XR400 All Years!Race to the finish line with...

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$119.99
$99.98
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$151.99
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$124.98
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$124.98

Honda TRX400EX TRX 400EX TITANIUM Exhaust Studs Valve Head Valve Cover Bolt Kit

BPRATV Talon Titanium

92900-08022-0B, 90301-HM8-000, 95701-08070-00, 90084-KCY-670, 90004-GHB-700, 90004-GHB-760, 90004-GHB-710BPRATV - The Original Trailblazer for Tita...

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$124.98
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$374.99
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$374.99
$223.41
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Honda TRX400EX TRX 400EX Kibblewhite Head Fix +1mm Intake Exhaust Valves Springs

Kibblewhite Precision

Best Honda TRX 400EX Kibblewhite Valves Spring Kit On Sale, 30-3111, 30-3116, 30-3118, 71016-4, 71016, 12209-413-003, 14711-KCY-670, 14721-KCY-670,...

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$223.41
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$999.99
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$999.99
$639.98
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05-14 Honda 400EX 400X Wiseco Crank Rod Motor Rebuild Repair Kit Piston Gaskets

Wiseco

Complete Wiseco Complete Engine Rebuild Rebuild Kit!Honda TRX400EX & TRX400X Years 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 ONLYThis k...

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$999.99
$639.98
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$999.99
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$999.99
$749.99
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05-14 400EX 400 EX Stock Simple Rebuild Kit Wiseco Piston Complete Gaskets Seals

BPRATV

Honda TRX 400EX 400X Simple Rebuild Kit (Stock Bore 85mm) We've heard your feedback! Some of our kits are Too Complete. We mean it when we say no o...

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$349.99
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$349.99
$238.88
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99-14 TRX400EX 400EX 400X XR400 89mm 10.8:1 440cc JE Piston Cometic Gaskets Kit

JE Pistons

JE 89mm 10.8:1 416cc Big Bore Piston Kit & Cometic Top End Gasket SetFits Honda TRX400EX, TRX400X, and XR400Years 1999 2000 2001 2002 2003 2004...

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$349.99
$238.88
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$238.88
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$599.99 - $599.99
$599.99
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$599.99

TRX400EX TRX 400EX Big Bore Kit 87mm Cylinder Stage 2 Hotcam Top End Rebuild Kit

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS NEW 87mm cylinder Wiseco CP or JE forged piston Hi temp piston rings Wristpin Circlips ...

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