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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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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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$1,799.99
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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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$1,799.99
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$1,699.99
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99-04 TRX400EX TRX 400EX 416 Big Bore Complete Motor Rebuild Valves Hotcams 87mm

BPRATV
Out of stock

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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$149.99
$149.99 - $149.99
$149.99
$124.99
$124.99 - $124.99
$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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$149.99
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$124.99
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$124.99
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$799.99
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$699.99
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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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$303.39
$303.39 - $303.39
$303.39
$257.88
$257.88 - $257.88
$257.88

05-14 Honda TRX400EX Wiseco Forged Clutch Basket Fibers Springs & Steels Kit NEW

BPRATV
Out of stock

Wiseco, WPP3043, 22100-HN1-A40, 22201-MAL-600, 22321-MV4-000, 22401-HN1-000, Upgrade your 05-14 (Honda TRX400EX/400X with a Wiseco Forged Clutch Ba...

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$303.39
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$303.39
$257.88
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$257.88
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$369.99
$369.99 - $369.99
$369.99
$298.88
$298.88 - $298.88
$298.88

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

BPRATV
Out of 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
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$369.99
$298.88
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$298.88
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$444.68
$444.68 - $444.68
$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
$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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$398.88
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$398.88
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$1,009.99
$1,009.99 - $1,009.99
$1,009.99
$699.98
$699.98 - $699.98
$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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$1,009.99
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$1,009.99
$699.98
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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
$699.98
$699.98 - $699.98
$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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$1,445.99
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$1,299.99
$1,299.99 - $1,299.99
$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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$1,299.99
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$1,299.99
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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
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$486.10
$447.50
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$447.50
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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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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
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$500.49
$323.89
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$323.89
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$999.99
$999.99 - $999.99
$999.99
$899.98
$899.98 - $899.98
$899.98

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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$999.99
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$999.99
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$999.99
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$999.99
$749.99
$749.99 - $749.99
$749.99

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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$999.99
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$472.99
$472.99 - $472.99
$472.99
$459.99
$459.99 - $459.99
$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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$472.99
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$472.99
$459.99
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$459.99
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$999.99 - $999.99
$999.99
$999.99 - $999.99
$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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$999.99 - $999.99
$999.99
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$999.99
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$1,264.95
$1,264.95 - $1,264.95
$1,264.95
$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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$1,264.95
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$1,264.95
$549.99
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$549.99
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$699.99
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$599.99

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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$699.99
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$599.99
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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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$799.99
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$1,799.99
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$1,699.99

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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$1,699.99
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$1,599.99
$1,599.99 - $1,599.99
$1,599.99
$1,099.99
$1,099.99 - $1,099.99
$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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$1,599.99
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$1,599.99
$1,099.99
$1,099.99 - $1,099.99
$1,099.99
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$1,299.99
$1,299.99 - $1,299.99
$1,299.99
$1,199.99
$1,199.99 - $1,199.99
$1,199.99

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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$1,299.99
$1,199.99
$1,199.99 - $1,199.99
$1,199.99
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Save 21% Save %
$139.99
$139.99 - $139.99
$139.99
$110.99
$110.99 - $110.99
$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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$139.99
$139.99 - $139.99
$139.99
$110.99
$110.99 - $110.99
$110.99
Save 21% Save %
$74.95 - $74.95
$74.95
$74.95 - $74.95
$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 - $74.95
$74.95
$74.95 - $74.95
$74.95
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$369.99
$369.99 - $369.99
$369.99
$298.88
$298.88 - $298.88
$298.88

Honda TRX400EX XR400 85mm 400cc Stock Bore Kit Wiseco Forged Piston Cometic MLS

BPRATV
Out of 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
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$369.99
$298.88
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$298.88
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$599.99
$599.99 - $599.99
$599.99
$447.50
$447.50 - $447.50
$447.50

TRX 400EX 400X 87mm Big Bore Cylinder +2mm Top End Rebuild Kit Complete Assembly

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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$599.99
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$599.99
$447.50
$447.50 - $447.50
$447.50
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$419.98
$419.98 - $419.98
$419.98
$376.88
$376.88 - $376.88
$376.88

TRX 400EX TRX400EX 400X 87mm 87 416cc Big Bore Cylinder 11:1 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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$419.98
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$419.98
$376.88
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$376.88
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$699.99
$699.99 - $699.99
$699.99
$489.98
$489.98 - $489.98
$489.98

Honda TRX 400EX Big Bore 89mm 440cc 12.5:1 Wiseco Piston Top Engine Rebuild Kit

BPRATV
In stock

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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$699.99
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$699.99
$489.98
$489.98 - $489.98
$489.98
Save 30% Save %
$386.78 - $386.78
$386.78
$388.88
$388.88 - $388.88
$388.88

TRX400EX 400EX 400X XR400 85mm Stock Bore Cylinder JE Piston Gaskets Rebuild Kit

BPRATV
Low stock

TRX400EX 400EX 400X XR400 85mm Stock Bore Cylinder JE Piston Gasket Rebuild Kit! ...

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$386.78 - $386.78
$386.78
$388.88
$388.88 - $388.88
$388.88
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$599.99
$599.99 - $599.99
$599.99
$447.50
$447.50 - $447.50
$447.50

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

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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$599.99
$599.99 - $599.99
$599.99
$447.50
$447.50 - $447.50
$447.50
Save 25% Save %
Save 37% Save %
$381.55
$381.55 - $381.55
$381.55
$238.87
$238.87 - $238.87
$238.87

TRX400EX 400EX 87mm 87 416cc Big Bore Cylinder 11:1 CP Piston Cometic Gasket Kit

BPRATV
Low stock

4628M08700, 133889, 4606M08700, 1043-2, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, ...

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$381.55
$381.55 - $381.55
$381.55
$238.87
$238.87 - $238.87
$238.87
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$999.99
$999.99 - $999.99
$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
Out of 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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$1,019.99
$1,019.99 - $1,019.99
$1,019.99
$744.44
$744.44 - $744.44
$744.44

TRX 400EX 89mm +4 Big Bore Cylinder Crank Wiseco Piston Engine Rebuild Kit 99-04

BPRATV
Low stock

WPC131A, 4667M08900, CBK0080, C7826, K014, B5047,4040, K014, B5047,4040, C7825, 808894, 822278, 4040, CBK0016, C7826, 12100-KCY-670, 4606M08500, C7...

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$1,019.99
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$1,019.99
$744.44
$744.44 - $744.44
$744.44
Save 27% Save %
Save 27% Save %
$1,019.99
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$1,019.99
$744.44
$744.44 - $744.44
$744.44

99-04 Honda TRX400EX 89mm 440 Big Bore Cylinder Wiseco Piston Engine Rebuild Kit

BPRATV
Low stock

WPC131A, 4667M08900, 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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TRX 400EX 87mm +2 Big Bore Cylinder Crank Wiseco Piston Engine Rebuild Kit 99-04

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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$386.78 - $386.78
$386.78
$388.88
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$388.88

TRX400EX 400EX 400X XR400 85mm Stock Bore Cylinder JE Piston Gaskets Rebuild Kit

BPRATV
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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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$605.79
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$424.44
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TRX 400EX 400X XR400 89mm Big Bore Cylinder 10.8:1 JE Piston Gaskets Rebuild Kit

BPRATV
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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$1,299.99
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$1,099.99
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$1,099.99

05+ TRX 400EX 400X Big Bore 89mm Complete Rebuilt Motor Engine Rebuild Parts Kit

BPRATV
In stock

FITS ALL '05+ HONDA TRX 400EX AND 400X MODELS NEW 89mm after market cylinder CP JE or Wiseco forged hi comp pump gas piston** Hi temp piston rings ...

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$999.98
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Honda TRX 400EX Assembled Cylinder Head Stage 2 Hot Cams Chain Big Bore 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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TRX 400EX 400EX Cylinder Head Stage 2 Hot Cams WISECO Chain Big Bore Cometic 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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$999.98
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Honda TRX400EX Assembled Cylinder Head Stage 2 Hot Cams WISECO Chain Cometic 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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$999.98
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400EX 400X XR400R Cylinder Head Stage 2 Hot Cams WISECO Chain Stock Cometic 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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$1,264.95
$444.43
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TRX400EX TRX 400EX Stage 1 Hotcam Hot Cam Valves Springs Chain Head Rebuild Kit

BPRATV
Low stock

FITS ALL HONDA TRX400EX TRX400X AND XR400R YEARS AND MODELS   COMPLETE PERFORMANCE HEAD REBUILD KIT! Listing includes: Stage 1 Hotcam Valve spri...

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$400.00
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$400.00
$398.88
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$398.88

TRX 400EX TRX400EX 400X 87mm 87 416cc Big Bore Cylinder 10:1 Top End Rebuild Kit

BPRATV
Low 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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