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OEM & Performance ATV, UTV & Dirt Bike Parts for Yamaha, Honda, Polaris, Can-Am & More — Shipped Fast from BPRATV
OEM & Performance ATV, UTV & Dirt Bike Parts for Yamaha, Honda, Polaris, Can-Am & More — Shipped Fast from BPRATV

Honda TRX400EX

Honda 400EX Rebuild Kits, Pistons, and Parts

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$34.42
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TRX 400EX 400X Sportrax 87mm 89mm Big Bore Head Gasket Cometic +4 Cylinder Top

Cometic Gaskets, Cometic, BPRATV, Honda TRX400EX
In stock

Cometic MLS head gasket for Honda TRX400EX, TRX400X, XR400R big bore engines. Supports 87–89mm bores with race-proven sealing. Cometic Honda TRX...

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

Wiseco
In stock

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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$1,119.99
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$768.99
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$768.99

99-04 400EX 400 EX BPR Stock Simple Rebuild Kit CP Piston Complete Gaskets Seals

BPRATV
In stock

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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$1,119.99
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$768.99
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$644.99
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$545.49
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$545.49

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

Hot Cams
In stock

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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$545.49
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$545.49
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$729.99
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$729.99

TRX 400EX 400X Cylinder Head Valve Cover Complete Rebuild Kit Stage 2 Hot Cam

BPRATV
In stock

FITS ALL HONDA 400EX 400X AND XR400R MODELS AND YEARS - THE ONLY TRULY COMPLETE REBUILD KIT ONLINE All parts are aftermarket Cylinder head Valve ...

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$729.99
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$999.99

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

BPRATV
In stock

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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$1,599.99

99-04 400EX 87mm Big Bore Rebuild Kit Top Bottom End Motor Engine Repair Redo

BPRATV
In stock

Works on all '99-04 Honda 400EX models 87mm big bore cylinder 87mm big bore Wiseco or Wossner forged piston Nitrite coated piston rings Chrome wr...

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$604.99
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$199.99
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$199.99

400EX 400X TITANIUM Cylinder Head Studs Ti Crankcase to Cylinder Both Kits Kit

BPRATV Talon Titanium
In stock

Complete kit for cylinder to crankcases and cylinder to head All Grade 5 Titanium alloy stud nut and washer kit Heat treated, allen head studs 12 p...

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$604.99
$199.99
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$571.99
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$44.99
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$44.99

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

SKF
Low stock

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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$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
In stock

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 poin...

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$699.99

99-04 400EX Sportrax Crank Bottom End Rebuild Crankshaft Motor Engine Assembly

BPRATV
In stock

FITS ALL HONDA 400EX 400X AND XR400R MODELS AND YEARS Hotrods or Wiseco crankshaft assembly with rod Complete gasket kit MLS head gasket  Oil seal...

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$699.99
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$33.34
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$33.34
$26.68
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$26.68

Best Honda TRX400EX TRX 400EX Head Gasket Cometic OEM Stock Bore MLS Gasket USA

Cometic Gaskets
In stock

Cometic MLS head gasket for Honda TRX400EX TRX400X XR400R. .027 thickness, 85-86mm bore. Durable USA-made gasket for reliable engine sealing. Com...

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$33.34
$26.68
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$26.68
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$26.68

Honda TRX400EX 400EX 85mm OEM Stock Bore Cometic MLS Head Gasket 12251-HN1-A41

Cometic Gaskets
In stock

Durable MLS gasket for Honda TRX400EX XR400R TRX400X. .027 thickness, 85-86mm bore, reliable performance upgrade. Cometic Honda TRX400EX TRX400X ...

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$26.68
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$243.10
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$243.10
$188.88
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$188.88

Honda TRX 400EX XR400 Kibblewhite Valve Spring Kit Bronze Valve Guides RED Seals

Kibblewhite Precision
In stock

Complete Kibblewhite Titanium Valve Spring Kit with Bronze Guides and RED Viton Seals for Honda TRX400EX, 400X, and XR400. USA-made performance upg...

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$243.10
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$243.10
$188.88
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$188.88
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$444.68
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$444.68
$398.88
$398.88 - $398.88
$398.88

Honda XR400 TRX 400EX 87mm 416cc Big Bore Top End Rebuild Kit Wiseco 10:1 Piston

BPRATV
In stock

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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$444.68
$398.88
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$398.88
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$444.68
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$444.68
$398.88
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$398.88

TRX400EX 400X XR400R 87mm 416cc Big Bore Kit Wiseco Piston + Cometic Gaskets NEW

BPRATV
In stock

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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$444.68
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$444.68
$398.88
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$398.88
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$64.99
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$64.99
$38.89
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$38.89

Honda 400EX 86 87 88 89 mm Big Bore Cometic Top End Gasket Kit C7826 Stem Seals

Cometic Gaskets
In stock

🔥 Honda TRX 400EX 86–89mm Big Bore Cometic Top End Gasket Kit C7826 + Seals 🔥 🛠️ Product Overview Designed for high-performance big bore bui...

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$64.99
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$38.89
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$264.00
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$264.00
$194.56
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$194.56

Honda 400EX 400X XR400R Kibblewhite Valves Red Viton Seals Stock Top End Gaskets

Kibblewhite Precision
In stock

30-3115, 30-3117, 30-3111, 30-3115, 71016-4, 71016 14711-KCY-670, 14721-KCY-670, 14411-KCY-670, 14431-KCY-670, 14445-KF0-000, 14446-KF0-000, 14751-...

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$194.56
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$489.99
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$489.99
$388.88
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$388.88

Honda TRX400EX 400X XR400 85mm Top End Rebuild Kit 10:1 CP Piston Cometic Gasket

CP-Carrillo
Low stock

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
$388.88
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$1,009.99
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$1,009.99
$699.98
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$699.98

99-04 Honda 400EX 88mm Big Bore Cylinder Crank Wiseco Piston Engine Rebuild Kit

BPRATV
In stock

Upgrade your 1999-2004 Honda TRX 400EX to a powerful 426cc with BPRATV’s complete big bore engine rebuild kit. Includes 88mm cylinder, Wiseco forge...

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$1,009.99
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$699.98
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$699.98
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$1,009.99
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$1,009.99
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$699.98

99-04 Honda 400EX 87mm Big Bore Cylinder Crank Wiseco Piston Engine Rebuild Kit

BPRATV
Low stock

WPC131A, 4606M08700, CBK0080, C7826, K014, B5047,4040, K014, B5047,4040, C7825, 808894, 822278, 4040, CBK0016, C7826, 12100-KCY-670, 4606M08500, C7...

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$699.98
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$699.98
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$1,009.99
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$1,009.99
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$699.98

99-04 Honda TRX400EX 87mm 416 Big Bore Cylinder Wiseco Piston Engine Rebuild Kit

BPRATV
Low stock

WPC131A, 4606M08700, CBK0080, C7826, K014, B5047,4040, K014, B5047,4040, C7825, 808894, 822278, 4040, CBK0016, C7826, 12100-KCY-670, 4606M08500, C7...

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$1,009.99
$699.98
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$699.98
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$496.85
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$496.85
$359.36
$359.36 - $359.36
$359.36

TRX400EX TRX 400EX XR400 Kibblewhite Valves Spring Guides Head Rebuild Kit Valve

Kibblewhite Precision
In stock

330-3120,30-3111,30-3115,30-3117,71016-4, 14711-KCY-670, 14721-KCY-670 14411-KCY-670, 14421-KCY-670 14431-KCY-670, 14445-KF0-000 14446-KF0-000, 144...

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$496.85
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$496.85
$359.36
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$359.36
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$1,445.99
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$1,445.99
$1,299.99
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$1,299.99

99-04 400EX Big Bore Stroker Kit 89mm Rebuild Complete Top Bottom 465cc Assembly

BPRATV
Low stock

4240, CBK0037, 4040, DPR8Z, WPC131A, WPC131B, CBK0016, TBK0012, K014, 3011-KCY-670, 90601-KA5-000, 13103-KCY-670, 13111-KCY-670, 12251-HN1-003, 122...

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$1,445.99
$1,299.99
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$1,299.99
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$149.99
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$149.99
$109.99
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$109.99

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

BPRATV Talon Titanium
In stock

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
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$149.99
$109.99
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$109.99
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$486.10
$486.10 - $486.10
$486.10
$447.50
$447.50 - $447.50
$447.50

Best 400EX 400X XR400 87mm Big Bore Cylinder Piston Kit 416 +2mm Top End Rebuild

BPRATV
In stock

1007-1, M2008, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, 1043-2,C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 131...

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$486.10
$486.10 - $486.10
$486.10
$447.50
$447.50 - $447.50
$447.50
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$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
Low stock

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
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$133.78
$119.89
$119.89 - $119.89
$119.89
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$133.78
$133.78 - $133.78
$133.78
$119.89
$119.89 - $119.89
$119.89

TRX 400EX 400X Valves Intake Exhaust Sportrax 400 ProX Valve KPMI RED Seals Kit

Pro-X
Low stock

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
$119.89
$119.89 - $119.89
$119.89
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$834.95
$834.95 - $834.95
$834.95
$802.33
$802.33 - $802.33
$802.33

Honda 400EX 400X 87mm 416cc CP 11 Pump Gas Big Bore Cylinder Stage 1 Hot Cam Kit

BPRATV
Low stock

1043-2, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-670, 13...

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$834.95
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$834.95
$802.33
$802.33 - $802.33
$802.33
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$27.49
$27.49 - $27.49
$27.49
$19.89
$19.89 - $19.89
$19.89

TRX 400EX 400X XR400 Stock OEM Hot Cams Camshaft Cam Shaft Bearing 91003-KF0-008

SKF
In stock

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

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$27.49
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$27.49
$19.89
$19.89 - $19.89
$19.89
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$27.49
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$27.49
$19.86
$19.86 - $19.86
$19.86

TRX 400EX 400X XR400 Stock OEM Hot Cams Camshaft Cam Shaft Bearing 91002-MN1-671

SKF
In stock

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

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$27.49
$27.49 - $27.49
$27.49
$19.86
$19.86 - $19.86
$19.86
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$39.99
$39.99 - $39.99
$39.99
$29.98
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$29.98

Cam Shaft Bearings For Honda TRX400EX TRX 400X XR400 91003-KF0-008 91002-MN1-671

SKF
In stock

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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$39.99
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$39.99
$29.98
$29.98 - $29.98
$29.98
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$33.34
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$33.34
$30.88
$30.88 - $30.88
$30.88

09-14 Honda TRX400X TRX 400EX 400X 87 88mm 89mm Big Bore Cometic MLS Head Gasket

Cometic, Cometic Gasket, Honda TRX 400EX 400X XR400, BPRATV
In stock

Cometic MLS head gasket for Honda TRX400EX, TRX400X, XR400R big bore engines. Supports 87–89mm bores with race-proven sealing. Cometic Honda TRX...

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$33.34
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$33.34
$30.88
$30.88 - $30.88
$30.88
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Save 7% Save %
$33.34
$33.34 - $33.34
$33.34
$30.88
$30.88 - $30.88
$30.88

Honda TRX400EX Sportrax TRX400X 87 88 89 mm Big Bore Cometic MLS Head Gasket USA

Cometic Gaskets
In stock

Cometic MLS head gasket for Honda TRX400EX, TRX400X, XR400R big bore engines. Supports 87–89mm bores with race-proven sealing. Cometic Honda TRX...

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$33.34
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$33.34
$30.88
$30.88 - $30.88
$30.88
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Save 34% Save %
$680.81
$680.81 - $680.81
$680.81
$448.89
$448.89 - $448.89
$448.89

TRX400EX 400EX 400X 87mm 87 mm 416cc CP Big Bore Cylinder Top End Kit Head Studs

CP-Carrillo
Low stock

M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-670, 13111-KCY-670, 12...

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$680.81
$680.81 - $680.81
$680.81
$448.89
$448.89 - $448.89
$448.89
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Save 35% Save %
$500.49
$500.49 - $500.49
$500.49
$323.89
$323.89 - $323.89
$323.89

Honda 400EX 400X XR400 Top End Rebuild Kit CP 10:1 Piston Gaskets Cylinder NGK🔥

BPRATV
Low stock

Honda 400EX 400X XR400 Top End Rebuild Kit CP 10:1 Piston Gaskets Cylinder NGK🔥 ...

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$500.49
$500.49 - $500.49
$500.49
$323.89
$323.89 - $323.89
$323.89
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Save 8% Save %
$277.76
$277.76 - $277.76
$277.76
$254.44
$254.44 - $254.44
$254.44

TRX400EX 400EX OEM Timing Guide Tensioner With Chain Tensioner HOTCAMS Cam Chain

Honda OEM
Low stock

FITS ALL HONDA 400EX 400X XR400R MODELS AND YEARSGenuine Honda OEM cam chain guide - OEM Part # 14620-KCY-670Genuine Honda OEM cam chain tensioner ...

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$277.76
$277.76 - $277.76
$277.76
$254.44
$254.44 - $254.44
$254.44
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$472.51
$472.51 - $472.51
$472.51
$454.44
$454.44 - $454.44
$454.44

Honda TRX400EX TRX 400EX 400X Stage 3 Three Hotcams Cam & Hot Cams Timing Chain✅

Hot Cams
Low stock

1051-3, HC82RH2010112, 91003-KF0-008, 91002-MN1-671, 14000-HN1-000, 14401-KCY-671,14401-KCY-671, HC82RH2010112, HC82RH2010112,CC004,14401-KCY-671,3...

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$472.51
$472.51 - $472.51
$472.51
$454.44
$454.44 - $454.44
$454.44
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$31.87 - $31.87
$31.87
$124.98
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Honda TRX400EX TRX 400EX TITANIUM Exhaust Studs Valve Head Valve Cover Bolt Kit

BPRATV Talon Titanium
In stock

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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$59.99
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$59.99
$39.99
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$39.99

Honda 400EX 400X XR400 Complete Titanium Left Crankcase Cover Bolts Screws Kit

BPRATV Talon Titanium
In stock

BPRATV - The Original Trailblazer for Titanium Hardware in the ATV Industry. Fits Honda TRX 400EX 400X XR400 All Years!Replaces OEM Part #: 90004-G...

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$39.99
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$349.99
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$349.99
$238.88
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$238.88

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

JE Pistons
Low stock

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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$238.88
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TRX400EX 400EX 400X 89mm 440cc 10.8:1 JE Piston Cometic Gaskets Kit Top End +4mm

JE Pistons Cometic Gaskets BPRATV Honda 400EX OEM Aftermarket Rep
Low stock

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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$238.88
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$999.99 - $999.99
$999.99
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$999.99

TRX400EX TRX 400EX 400X Complete Assembled Head Porting Port Assemble Valves Kit

BPRATV
In stock

FITS ALL HONDA TRX400EX AND 400X MODELS AND YEARS NEW AFTER MARKET cylinder head with valve cover  Full race port and polish  Complete head assem...

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$1,264.95
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$549.99
$549.99 - $549.99
$549.99

TRX400EX TRX 400EX Stage 2 Hotcam Hot Cam Valves Springs Rockers Head Rebuild

BPRATV
Low stock

FITS ALL HONDA TRX400EX TRX400X AND XR400R YEARS AND MODELS   COMPLETE PERFORMANCE HEAD REBUILD KIT! Stage 2 Hotcam Complete valve train head re...

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$549.99
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$699.99
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$599.99
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Honda 400EX 400X Top End Rebuild Cylinder Head Valve Cover Stock Upper Assembly

BPRATV
In stock

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS NEW aftermarket cylinder 10:1 piston Hi-temp piston rings Chrome wrist pin Circlips To...

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$599.99
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$799.99
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TRX 400EX 400X Cylinder Head Valve Cover Complete Rebuild Kit Stage 1 Hotcam

BPRATV
In stock

FITS ALL HONDA 400EX 400X AND XR400R MODELS AND YEARS - THE ONLY TRULY COMPLETE REBUILD KIT ONLINE All parts are aftermarket Cylinder head Valve ...

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$1,799.99
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$1,699.99
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400EX Cylinder Head Kibblewhite Valves Complete Top End Rebuild Stage 2 Hotcam

BPRATV
In stock

THIS IS IT! NO ONE SELLS IT LIKE WE DO! FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS Kit includes: NEW aftermarket 85mm cylinder ...

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$229.99
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$229.99
$199.98
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$199.98

Honda 400EX 400X XR400R OEM Timing Guide Tensioner & Chain Tensioner Cam Chain

Honda OEM
Low stock

FITS ALL HONDA 400EX 400X XR400R MODELS AND YEARSGenuine Honda OEM cam chain guide - OEM Part # 14620-KCY-670Genuine Honda OEM cam chain tensioner ...

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$229.99
$199.98
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