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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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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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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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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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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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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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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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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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$496.85
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$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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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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$149.99
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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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$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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$133.78
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$119.89
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$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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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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$119.89
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$834.95
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$802.33
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$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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$802.33
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$27.49
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$19.89
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$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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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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$39.99
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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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$33.34
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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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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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$680.81
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$680.81
$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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$500.49
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$323.89
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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
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$500.49
$323.89
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$277.76
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$277.76
$254.44
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$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
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$277.76
$254.44
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$254.44
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$314.99
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$314.99
$219.89
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$219.89

Honda 400EX 400X Wiseco 89mm BIG BORE 12.5:1 Piston COMETIC Top End Gasket Kit

Wiseco
Out of stock

Honda TRX 400EX 440cc Wiseco 89mm Big Bore 12.5:1 Compression Piston & Cometic Top End Gasket KitFits Honda TRX 400EX & 400XYears 1999 2000...

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$314.99
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$219.89
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$219.89
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$472.51
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$472.51
$454.44
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$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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$999.99
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$999.99
$899.98
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TRX400X TRX400EX Wiseco Complete Rebuilt Motor Engine Rebuild Top Bottom End Kit

BPRATV
Out of stock

FITS ALL '05+ 400EX AND 400X ALL YEARS ALL MODELS NEW stock bore after market cylinder CP JE Wiseco or Wossner forged piston* Hi temp piston rings ...

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$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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$59.99
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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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$999.99
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$749.99
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05-14 400EX 400 EX Stock Simple Rebuild Kit Wiseco Piston Complete Gaskets Seals

BPRATV
Out of 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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$349.99
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$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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$349.99
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$349.99
$238.88
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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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$349.99
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$349.99
$238.88
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$238.88
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$472.99
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$472.99
$459.99
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$459.99

BPRATV TRX400EX TRX 400EX Cylinder Wiseco Piston Stock Bore Top End Rebuild Kit

BPRATV
Out of stock

12100-KCY-670, 12191-KCY-672, 13011-KCY-670, 13101-KCY-670, 90601-KA5-000, 13111-KCY-670, 12100-HN1-A70, 12191-KCY-672, 12251-HN1-003, 12391-KCY-67...

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$459.99
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$999.99
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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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$999.99
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$1,264.95
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$549.99
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$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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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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$699.99
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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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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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$1,799.99
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$229.99
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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
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$229.99
$199.98
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$199.98
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$1,599.99
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$1,099.99

99-04 TRX 400EX 88mm Rebuild Kit Top Bottom Big Bore Motor Engine Assembly 426c

BPRATV
In stock

WORKS ON ALL '99-04 HONDA 400EX MODELS Aftermarket 88mm big bore cylinder 88mm big bore Wiseco JE or CP forged piston* Nitrite coated piston rings ...

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$1,099.99
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$1,299.99
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$1,199.99
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Honda 400EX 400X +1 Ported Assembled Head Port Porting Kibblewhite +1mm Valves

BPRATV
In stock

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARSNEW after-market cylinder head and valve cover Full race port and polish Valve guides cut...

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$1,299.99
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$139.99
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$139.99
$110.99
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$110.99

400EX 400X XR400R Ti Cylinder Head Studs Strongest Heavy Duty Titanium Stud Kit

BPRATV
In stock

FITS ALL HONDA TRX400EX XR400R AND 400X MODELS AND YEARS - BUY IN BULK AND SAVE $$$Complete kit for cylinder headAll titanium stud and nut kitMade ...

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$110.99
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$110.99
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$74.95 - $74.95
$74.95
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$74.95

Honda TRX400EX TRX 400EX 400X OEM Extreme Heavy Duty Hotcam Hot Cam Timing Chain

BPRATV
In stock

HC82RH2010112,CC004,14401-KCY-671,31.1496,SCA0409SV112 Brand New Direct Replacement Hot Cams Heavy Duty Timing Chain Fits Honda TRX400EX, TRX400X,...

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$74.95
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$33.34
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$33.34
$26.68
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$26.68

Honda TRX400EX/TRX400X/XR400R 0.027" MLS Cylinder Head Gasket 86mm 85mm OEM Bore

Cometic Gaskets
In stock

Replace your TRX400EX head gasket with Cometic MLS. Fits 85-86mm bore, .027 thickness, durable and high performance. Cometic Honda TRX400EX TRX40...

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Cometic MLS Head Gasket 85mm OEM Stock Bore Head Gasket for Honda TRX400EX 400EX

Cometic Gaskets
In stock

Premium MLS gasket for Honda TRX400EX TRX400X XR400R. .027 thickness ensures optimal combustion sealing and durability. Cometic Honda TRX400EX TR...

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$26.68
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$26.68

09-14 Honda TRX400X TRX 400EX 400X 85mm OEM Stock Bore Cometic MLS Head Gasket

Cometic Gaskets
In stock

High-quality Cometic MLS gasket for Honda 400EX TRX400X XR400R. Built for stock bore engines with precision sealing. Cometic Honda TRX400EX TRX40...

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$243.10
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$243.10
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$188.88

Kibblewhite Top End Spring Guide Seal Kit Honda TRX400EX 400X XR400 Performance!

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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$188.88
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$188.88
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$349.99
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$349.99
$218.88
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$218.88

Wiseco 88mm Big Bore Cylinder Piston & Cometic Gasket Kit Honda 400EX 400X XR400

Wiseco
Out of stock

4628M08800, C7826, 4606M08800, 8604D300, 4606M08800, 177240, 177239, Upgrade your Honda 400EX, 400X, or XR400R with this Wiseco 88mm 426cc Big Bore...

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$349.99
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$349.99
$218.88
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$218.88
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$349.99
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$349.99
$218.88
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$218.88

Wiseco 87mm 11:1 416 Big Bore Piston + Cometic Top Gasket Kit Honda 400EX XR400R

Wiseco
Out of stock

4628M08700, C7826, 4606M08700, M2001, 133889, Upgrade your Honda 400EX, 400X, or XR400R with this Wiseco 87mm 416cc Big Bore Piston & Cometic G...

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$218.88
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$349.99
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$349.99
$218.88
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$218.88

Honda TRX 400EX 400X 416 87mm Wiseco Big Bore Cylinder Piston Cometic Gasket Set

Wiseco
Out of stock

4628M08700, C7826, 4606M08700, M2001, 133889, Upgrade your Honda 400EX, 400X, or XR400R with this Wiseco 87mm 416cc Big Bore Piston & Cometic G...

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$349.99
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$349.99
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