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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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1996-2014 Honda Cylinder Head Valve Cover Gasket XR400R TRX 400EX 12391-KCY-671

BPRATV
In stock

12391-KCY-671,VC03201,XG119,CRUGVKCY,C7826, C7825, 12251-KCY-671, 12191-KCY-671, 91302-356-000, 18291-MN5-650, 14523-KBB-901, 91301-200-000, 91306-...

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$619.99
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$490.16
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$490.16

TRX 400EX 400X Hot Rods Crank Bearings Hot Rods Rod Crankshaft Main Bearing Kit

Hot Rods
In stock

Hot Rods Crank, 4040, 13000-MBV-730,4040,K014,91001-KF0-018,13000MBV730,91001KF0018Premium Hot Rods Crankshaft & SKF Main Bearing Kit for Honda...

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$490.16
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$299.99
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$299.99
$268.88
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$268.88

TRX 400EX 400X XR 400R Stock Cylinder Piston Top End Rebuild Kit Performance Cam

BPRATV, SKF, Talon, Honda TRX400EX TRX 400EX 400X XR400R
In stock

4606M08500, C7825, 1051-3, 12100-KCY-670, 71016-4,4667M08900, 1043-2, C7826, 1051-3, 12100-KCY-670, 71016-4, 13111-KCY-670, 4606M08500, C7826, 7101...

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$268.88
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$268.88
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$459.99
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$459.99
$398.88
$398.88 - $398.88
$398.88

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

JE Pistons
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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$398.88
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$424.44
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$424.44

TRX 400EX 400X 87mm Big Bore Cylinder 12:1 JE Piston Cometic Top End Rebuild Kit

BPRATV
In stock

199656, 1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13...

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$424.44
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$424.44

Honda TRX400EX 400EX 400X XR400 87mm 416cc JE Cometic 12:1 Cylinder Big Bore Kit

BPRATV
In stock

199656, 1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13...

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$398.88
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$398.88

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

JE Pistons
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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$398.88
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$398.88
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$480.78
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$480.78
$388.88
$388.88 - $388.88
$388.88

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

JE Pistons
Low 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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$388.88
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$999.99
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$699.98
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$699.98

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

BPRATV
In stock

>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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$699.98
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$687.49
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$687.49
$489.99
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$489.99

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

BPRATV
In stock

Complete Honda TRX400EX TRX400X bottom end rebuild kit with Talon HD crankshaft, SKF bearings, clutch kit, gaskets, seals, titanium head studs, and...

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$687.49
$489.99
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$489.99
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$97.66
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$97.66
$86.48
$86.48 - $86.48
$86.48

Honda TRX400EX 400X XR400 Kibblewhite Heavy Duty High Temp Head Studs 30-33750

Kibblewhite Precision
In stock

Upgrade your Honda TRX400EX with Kibblewhite heavy duty head studs featuring 180000 PSI alloy steel construction and superior clamping force. Upg...

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$97.66
$86.48
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$86.48
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$1,445.99
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$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
Out of 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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$469.99
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$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
In stock

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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$398.88
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$44.99
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$44.99
$34.99
$34.99 - $34.99
$34.99

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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$119.99
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$119.99
$99.98
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$99.98

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

BPRATV, Talon Titanium, Honda 400EX 400X XR400
In stock

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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$449.99
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$449.99
$394.98
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$394.98

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

Kibblewhite Precision
In stock

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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$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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$644.99
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$644.99
$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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$199.99
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$199.99
$195.00
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$195.00

Honda 400EX 400X 87mm Piston Wiseco Big Bore +2 Over Piston Cometic Gasket Kit

BPRATV
Out of stock

Works on all Honda 400EX, 400X, and XR400R models and years Wiseco 87mm big bore forged piston Nitrite coated piston rings Chrome wristpin Circli...

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$199.99
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$199.99
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$195.00
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$1,699.99
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99-04 Honda 400EX Cylinder Head Complete Top Bottom End Rebuild Kit Assembly Kit

BPRATV
Out of stock

Works on all '99-04 Honda 400EX models 85mm stock bore cylinder 85mm stock bore Wiseco or Wossner forged piston Nitrite-coated piston rings Chrom...

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$149.99
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$149.99
$105.99
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$105.99

99-08 Honda 400EX Crank Pin Rod Bearing Bottom End Crankshaft Rod Rebuild Kit

BPRATV
Out of stock

WORKS ON ALL HONDA 1999-2008 400EX and 2009-2014 TRX 400X YEAR MAKE MODELS Aftermarket replacement crank pin and rod bearing Includes thrust wash...

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$799.99
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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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$1,294.11
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$1,294.11
$1,099.99
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$1,099.99

99-04 TRX 400EX Complete Rebuilt Motor Engine Rebuild Top & Bottom End Parts Kit

BPRATV
Low stock

FITS ALL 99-04 HONDA TRX400EX SPORTRAX MODELS NEW after market cylinder CP JE or Wiseco forged piston** Hi temp piston rings Wristpin Circlips Hotr...

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$33.34
$33.34 - $33.34
$33.34
$26.68
$26.68 - $26.68
$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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$26.68
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$102.99
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$102.99
$89.98
$89.98 - $89.98
$89.98

Honda TRX400EX 400EX 89mm 89 Big Bore Wiseco Piston Rings Set COMETIC Gasket Kit

Wiseco
In stock

Honda TRX400EX 89mm Wiseco Piston Rings + Cometic Gasket Kit Restore Power & Reliability This premium top-end refresh package combines Wisec...

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$102.99
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$102.99
$89.98
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$89.98
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$149.99
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$149.99
$108.88
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$108.88

Best 400EX 400X XR400 Cylinder Head Studs ALL TITANIUM Stud Bolt Nut Upgrade Kit

BPRATV Talon Titanium
In stock

30-33750, 90085-KCY-670, 90083-KG0-981,Upgrade your Honda 400EX, 400X, or XR400R with the BPRATV Talon Titanium Cylinder Head Stud Kit. Stronger, ...

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$149.99
$108.88
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$108.88
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$36.00
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$36.00
$28.81
$28.81 - $28.81
$28.81

Honda TRX400EX 400EX 400X XR400R Valve Keeper Cotters Complete Set 14781-HA0-770

BPRATV
In stock

Honda OEM, 14781-HA0-770, XC110, 519-CVV2220C, Secure your Honda's valvetrain with BPRATV's Valve Keeper Cotters Set of 8! Direct OEM replacement f...

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$36.00
$28.81
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$28.81
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$369.99
$369.99 - $369.99
$369.99
$288.88
$288.88 - $288.88
$288.88

Honda TRX400EX 400X 85mm 400cc Stock Bore Top End Rebuild Kit Wiseco Cometic NEW

Wiseco, Cometic Gaskets, BPRATV, Honda TRX400EX 400X XR400R
In stock

4606M08500 / C7825 / 400EX-CYL85, 3P-400, 12100-KCY-670,1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY...

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$288.88
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$288.88
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$369.99
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$369.99
$288.88
$288.88 - $288.88
$288.88

Honda TRX400EX 400X XR400 OEM Stock Bore Kit 85mm Wiseco Piston & Cometic Gasket

BPRATV
In stock

4606M08500 / C7825 / 400EX-CYL85, 3P-400, 12100-KCY-670,1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY...

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$369.99
$288.88
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$288.88
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$444.68
$444.68 - $444.68
$444.68
$398.88
$398.88 - $398.88
$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
$64.99 - $64.99
$64.99
$38.89
$38.89 - $38.89
$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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$64.99
$38.89
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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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$264.00
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$264.00
$194.56
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$194.56
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$21.77
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$21.77
$18.88
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$18.88

Cylinder Head Valve Cover Metal Gasket for Honda TRX 400EX TRX400X 12391-KCY-671

BPRATV
In stock

12391-KCY-671,VC03201,XG119,CRUGVKCY,C7826, C7825, 12251-KCY-671, 12191-KCY-671, 91302-356-000, 18291-MN5-650, 14523-KBB-901, 91301-200-000, 91306-...

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$21.77
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$21.77
$18.88
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$18.88
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$999.99
$999.99 - $999.99
$999.99
$648.88
$648.88 - $648.88
$648.88

Honda TRX 400EX 85mm Stock Cylinder Crank Wiseco Piston Engine Rebuild Kit 99-04

BPRATV
In stock

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

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$999.99
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$999.99
$648.88
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$648.88
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$999.99
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$999.99
$648.88
$648.88 - $648.88
$648.88

99-04 Honda 400EX 85mm OEM Bore Cylinder Crank Wiseco Piston Engine Rebuild Kit

BPRATV
In stock

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

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$999.99
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$999.99
$648.88
$648.88 - $648.88
$648.88
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$1,009.99
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$1,009.99
$699.98
$699.98 - $699.98
$699.98

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

BPRATV
In 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
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$1,009.99
$699.98
$699.98 - $699.98
$699.98
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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 TRX400EX 87mm 416 Big Bore Cylinder Wiseco Piston Engine Rebuild Kit

BPRATV
In 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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$459.99
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$398.88
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TRX400EX 400EX 400X XR400 87mm Big Bore Cylinder JE Piston & Gaskets Rebuild Kit

JE Pistons
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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$480.78
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$480.78
$388.88
$388.88 - $388.88
$388.88

TRX400EX 400EX 400X 88mm Big Bore Cylinder JE Piston Cometic Top End Rebuild Kit

JE Pistons
Low 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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$424.44
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$424.44

TRX 400EX 400X 88mm Big Bore Cylinder 13:1 JE Piston Cometic Top End Rebuild Kit

JE Pistons
Low 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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$496.85
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$496.85
$359.36
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$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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TRX400EX 400EX Assembled Cylinder Head Stage 2 Hot Cams Chain & 87 88 89 Cometic

BPRATV
Out of stock

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-HA0-770, ...

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$1,684.22
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$999.98
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Honda TRX400EX Assembled Cylinder Head Stage 2 Hot Cams Chain Cometic Gasket Kit

BPRATV
Out of stock

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-HA0-770, ...

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$479.99
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Honda TRX 400EX X Top End Rebuild Repair Kit CP Carrillo Piston Gaskets Cylinder

BPRATV
In stock

Complete Standard Bore Top End Rebuild Kit!Honda TRX400EX & TRX400X Years 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012...

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$43.98
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$31.19
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Honda 400EX 400X XR400R BPRATV Stronger Heavy Duty Exhaust Head Pipe Studs Bolts

BPRATV Talon Titanium
In stock

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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$31.19
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$133.78
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$119.89
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$119.89

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

Pro-X
In 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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$119.89
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$34.42
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$30.88
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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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$448.89
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$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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