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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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$1,152.33
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$692.98
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$692.98

Honda 400EX 400X 88mm +3 Big Bore Kit Stage 2 Cam 426cc Top End Rebuild 2 Hotcam

BPRATV

Works on all Honda 400EX, 400X, and XR400R models and years 88mm heavy-duty big bore cylinder 88mm big bore Wiseco or Wossner forged piston Nitrite...

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$486.10
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$486.10
$388.88
$388.88 - $388.88
$388.88

Honda 400EX 400X 88mm Big Bore Kit +3 Cylinder Piston 426cc Upper Assembly Parts

BPRATV

12100-KCY-670, 4606M08800, C7826, 71016-4, 12191-KCY-673,12100-KCY-670, 12191-KCY-672, 13011-KCY-670, 13101-KCY-670, 90601-KA5-000, 13111-KCY-670, ...

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$486.10
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$388.88
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$388.88
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Get best 400ex 88mm big bore near me Sold out
$741.15
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$741.15
$629.98
$629.98 - $629.98
$629.98

Honda 400EX 400X 88mm +3 Big Bore Kit Stage 3 Cam 426cc Top End Rebuild Hotcam

BPRATV

Works on all Honda 400EX, 400X, and XR400R models and years 88mm heavy-duty big bore cylinder 88mm big bore Wiseco or Wossner forged piston Nitrite...

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$741.15
$741.15 - $741.15
$741.15
$629.98
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An assortment of motorcycle engine parts including a piston, piston rings, wrist pin, circlips, gaskets, and a cylinder head stud kit, with branding visible on the packaging such as Wiseco and Cometic. Sold out
$486.10
$486.10 - $486.10
$486.10
$388.88
$388.88 - $388.88
$388.88

400EX 400X XR400 88mm Big Bore Kit +3 Cylinder 426 Top End Rebuild Redo Parts

BPRATV

12100-KCY-670, 4606M08800, C7826, 71016-4, 12191-KCY-673,12100-KCY-670, 12191-KCY-672, 13011-KCY-670, 13101-KCY-670, 90601-KA5-000, 13111-KCY-670, ...

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$486.10
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$486.10
$388.88
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$388.88
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$99.99
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$99.99
$49.99
$49.99 - $49.99
$49.99

BPRATV Honda TRX 400EX XR400R 87 88 89mm Complete Gasket Kit COMETIC Big Bore HG

Cometic Gaskets

Kit Includes: - BPRATV Complete Gasket Kit with Valve Stem Seals- COMETIC Big Bore 87-89mm MLS Head Gasket. The Best Head Gasket. Period.*Made with...

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$99.99
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$99.99
$49.99
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$866.24
$866.24 - $866.24
$866.24
$750.74
$750.74 - $750.74
$750.74

Honda 400EX 400X 88mm Big Bore Kit Valves Springs Stage 2 Hotcam +3 426c Top End

BPRATV

88mm cylinder Wiseco or Wossner forged piston Hi-temp piston rings Chrome wrist pin Circlips Cometic top-end gasket kit Hotcams Stage 2 Camshaf...

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$866.24
$866.24 - $866.24
$866.24
$750.74
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$750.74
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$216.71
$216.71 - $216.71
$216.71
$174.99
$174.99 - $174.99
$174.99

Honda 400EX 400X Wiseco Piston Top End Gaskets Stock Replace Hi Comp Pump Gas

Wiseco

Works on all Honda 400EX, 400X, and XR400R models and years Wiseco 85mm 10:1 forged piston Nitrite coated piston rings Chrome wristpin Circlips T...

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$216.71
$216.71 - $216.71
$216.71
$174.99
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$599.99
$599.99 - $599.99
$599.99
$489.99
$489.99 - $489.99
$489.99

Honda 400EX Rebuilt Bottom Lower End Rebuild Kit Crank Trans Main Bearings 99-04

BPRATV

COMPLETE BOTTOM END REBUILF FOR HONDA TRX 400EX!A Great & Affordable Complete Bottom End Rebuild Kit with a New Crankshaft, Complete Replacemen...

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$599.99
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$599.99
$489.99
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$489.99
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$436.78
$436.78 - $436.78
$436.78
$304.88
$304.88 - $304.88
$304.88

TRX 400EX 400X XR400 88mm Big Bore Cylinder 13:1 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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Sold out
$486.10
$486.10 - $486.10
$486.10
$388.88
$388.88 - $388.88
$388.88

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

BPRATV

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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$486.10
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$486.10
$388.88
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$388.88
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Sold out
$436.78
$436.78 - $436.78
$436.78
$304.88
$304.88 - $304.88
$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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$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 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
$304.88 - $304.88
$304.88
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Sold out
$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
$304.88 - $304.88
$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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Sold out
$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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$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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$581.79
$581.79 - $581.79
$581.79
$324.88
$324.88 - $324.88
$324.88

TRX400EX 400EX 400X 89mm 440cc Big Bore Cylinder JE 11:1 Piston Cometic Top 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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$581.79
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$581.79
$324.88
$324.88 - $324.88
$324.88
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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

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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$1,009.99
$699.98
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$436.78
$436.78 - $436.78
$436.78
$399.98
$399.98 - $399.98
$399.98

TRX400EX 400EX 400X 88mm 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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$436.78
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$436.78
$399.98
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$399.98
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$436.78
$436.78 - $436.78
$436.78
$304.88
$304.88 - $304.88
$304.88

TRX 400EX 400X 88mm Big Bore Cylinder 13:1 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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$436.78
$436.78 - $436.78
$436.78
$304.88
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$304.88
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$1,419.99
$1,419.99 - $1,419.99
$1,419.99
$1,199.99
$1,199.99 - $1,199.99
$1,199.99

05+ 400EX 400X Big Bore Stroker Complete 465cc Rebuilt Motor Engine Rebuild Kit

BPRATV

4240,CBK0037,CBK0163,808894,TBK0012,K014, 12100-KCY-670, 4606M08500, C7826, 71016-412191-KCY-673, 13011-KCY-670, 90601-KA5-00013103-KCY-670, 13111-...

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$1,419.99
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$1,419.99
$1,199.99
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$369.99
$369.99 - $369.99
$369.99
$277.77
$277.77 - $277.77
$277.77

Honda TRX400EX XR 400X Top End Rebuild Repair Kit Wiseco Piston Gaskets Cylinder

Wiseco

12100-KCY-670, 4606M08500, C7825, 12191-KCY-673, 13011-KCY-670, 90601-KA5-000, 13103-KCY-670, 13111-KCY-670, 12251-HN1-003, PK1031Complete Standard...

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$369.99
$369.99 - $369.99
$369.99
$277.77
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$999.99 - $999.99
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$1,718.99
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99-04 400EX 400 EX 87mm Simple Rebuild Kit Wossner Piston Complete Gaskets Seals

BPRATV

Honda TRX 400EX 400X Simple Rebuild Kit (Big Bore 87mm) We've heard your feedback! Some of our kits are Too Complete. We mean it when we say no one...

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$999.99 - $999.99
$999.99
$1,718.99
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$1,718.99
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$308.30
$308.30 - $308.30
$308.30
$269.99
$269.99 - $269.99
$269.99

Honda TRX400EX 400EX 400X 87mm 10.8:1 416cc JE Piston Cometic Gaskets Kit Seals

JE Pistons

JE 87mm 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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$308.30
$308.30 - $308.30
$308.30
$269.99
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$999.99
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$849.99
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TRX400EX TRX 400EX 88mm Big Bore Stage 2 Cam Kibblewhite Valves 426 Top End 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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$999.99
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$999.99
$849.99
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$1,099.99 - $1,099.99
$1,099.99
$1,099.99 - $1,099.99
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99-04 TRX 400EX 88mm Rebuild Kit Top Bottom Big Bore Motor Engine Assembly 426c

BPRATV

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 - $1,099.99
$1,099.99
$1,099.99 - $1,099.99
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$1,129.99
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$1,129.99
$789.99
$789.99 - $789.99
$789.99

05-14 400EX 400 EX 88mm Simple Rebuild Kit Wiseco Piston Complete Gaskets Seals

BPRATV

WPC131A, 4606M08800, CBK0080, C7826, K014, B5047,4040, K014, B5047,4040, C7825, 808894, 822278, 4040, CBK0016, C7826, 12100-KCY-670, 4606M08500, C7...

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$1,129.99
$1,129.99 - $1,129.99
$1,129.99
$789.99
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$581.79
$581.79 - $581.79
$581.79
$324.88
$324.88 - $324.88
$324.88

Honda TRX 400EX Big Bore Top End Rebuild Kit 89mm +4 Cylinder 11:1 JE Piston 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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$581.79
$581.79 - $581.79
$581.79
$324.88
$324.88 - $324.88
$324.88
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$581.79
$581.79 - $581.79
$581.79
$324.88
$324.88 - $324.88
$324.88

TRX400EX 400EX 400X XR400 89mm 89mil 11:1 440cc JE Cometic 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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$581.79
$581.79 - $581.79
$581.79
$324.88
$324.88 - $324.88
$324.88
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$581.79
$581.79 - $581.79
$581.79
$324.88
$324.88 - $324.88
$324.88

TRX 400EX 400X 89mm Big Bore Cylinder 11:1 JE Piston Cometic Top End Rebuild 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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$581.79
$581.79 - $581.79
$581.79
$324.88
$324.88 - $324.88
$324.88
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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 87mil 10.8 416cc JE Cometic 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
$436.78 - $436.78
$436.78
$304.88
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$304.88
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$1,009.99
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$1,009.99
$699.98
$699.98 - $699.98
$699.98

TRX 400EX 88mm +3 Big Bore Cylinder Crank Wiseco Piston Engine Rebuild Kit 99-04

Wiseco

WPC131A, 4606M08800, 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
$1,009.99 - $1,009.99
$1,009.99
$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 88mm 426 Big Bore Cylinder Wiseco Piston Engine Rebuild Kit

BPRATV

WPC131A, 4606M08800, 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
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$719.98
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$719.98

TRX 400EX 400X 88mm Big Bore Cylinder Crank Wiseco Piston Engine Rebuild Kit 05+

Wiseco

WPC131B, 4606M08800, C7826, K014, B5047,4040, C7825, 808894, 822278, 4040, CBK0016, C7826, 12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673...

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$1,009.99
$1,009.99 - $1,009.99
$1,009.99
$719.98
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$1,009.99
$1,009.99 - $1,009.99
$1,009.99
$719.98
$719.98 - $719.98
$719.98

05+ Honda TRX400EX 88mm Big Bore Cylinder Crank Wiseco Piston Engine Rebuild Kit

Wiseco

WPC131B, 4606M08800, C7826, K014, B5047,4040, C7825, 808894, 822278, 4040, CBK0016, C7826, 12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673...

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$1,009.99
$1,009.99 - $1,009.99
$1,009.99
$719.98
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$719.98
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$1,009.99
$1,009.99 - $1,009.99
$1,009.99
$719.98
$719.98 - $719.98
$719.98

05+ Honda 400EX 400X 88mm 426 Big Bore Cylinder Wiseco Piston Engine Rebuild Kit

Wiseco

WPC131B, 4606M08800, C7826, K014, B5047,4040, C7825, 808894, 822278, 4040, CBK0016, C7826, 12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673...

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$1,009.99
$1,009.99 - $1,009.99
$1,009.99
$719.98
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$1,419.99
$1,419.99 - $1,419.99
$1,419.99
$1,199.99
$1,199.99 - $1,199.99
$1,199.99

05+ Honda TRX 400EX 400X 89m Big Bore 4mm Stroker Complete 465 Motor Rebuild Kit

BPRATV

4240,CBK0037,CBK0163,808894,TBK0012,K014, 12100-KCY-670, 4606M08500, C7826, 71016-412191-KCY-673, 13011-KCY-670, 90601-KA5-00013103-KCY-670, 13111-...

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$1,419.99
$1,199.99
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$1,199.99
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$257.75
$257.75 - $257.75
$257.75
$188.88
$188.88 - $188.88
$188.88

Honda 400EX 400X Wiseco 85mm Stock Bore 10:1 Piston Cometic 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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$257.75
$188.88
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$188.88
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$257.75
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$257.75
$188.88
$188.88 - $188.88
$188.88

Honda TRX 400EX 400X XR400 Wiseco 85mm10:1 Piston Kit Cometic 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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$188.88
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$188.88
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$499.99
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$499.99
$418.88
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$418.88

TRX 400EX TRX400EX 400X 88mm 88 426cc Big Bore Cylinder 11:1 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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$418.88
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$314.99
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$314.99
$219.89
$219.89 - $219.89
$219.89

Honda 400EX 400X Wiseco 89mm BIG BORE 11:1 Piston COMETIC Top End Gasket Kit MLS

Wiseco

Honda TRX 400EX 440cc Wiseco 89mm Big Bore 11:1 Compression Piston & Cometic Top End Gasket KitFits Honda TRX 400EX & 400XYears 1999 2000 2...

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$259.99
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$259.99
$189.97
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$189.97

Honda 400EX 400X Wiseco 85mm Stock Bore 10:1 Piston COMETIC Top End Gasket Kit

Wiseco

Wiseco 85mm Stock Bore 10:1 Compression Piston & Cometic Top End Gasket KitFits Honda TRX 400EX & 400XYears 1999 2000 2001 2002 2003 2004 2...

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$259.99
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$189.97
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$999.99
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$999.99
$874.99
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$874.99

TRX 400EX 400X 88mm Big Bore Kit Stage 3 Cam Kibblewhite Valves Springs Hotcam

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS NEW after market 88mm cylinder Wiseco or JE forged piston** Nitrite coated piston rings ...

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TRX 400EX TRX 400EX 88mm Big Bore Stage 2 Cam +1 Valves +3 Cylinder Hotcams KPMI

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS NEW after market 88mm cylinder Wiseco or JE forged piston* Nitrite coated piston rings C...

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$1,129.99
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$789.99
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99-04 400EX 400 EX 88mm Simple Rebuild Kit Wiseco Piston Complete Gaskets Seals

Hot Rods

Honda TRX 400EX 400X Simple Rebuild Kit (Big Bore 88mm) We've heard your feedback! Some of our kits are Too Complete. We mean it when we say no one...

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$999.99 - $999.99
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$1,718.99
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05-14 400EX 400 EX 87mm Simple Rebuild Kit Wossner Piston Complete Gaskets Seals

BPRATV

Honda TRX 400EX 400X Simple Rebuild Kit (Big Bore 87mm) We've heard your feedback! Some of our kits are Too Complete. We mean it when we say no one...

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$23.69 - $23.69
$23.69
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$23.69

05-08 Honda Sportrax TRX 400EX 09-14 400X Vertex Complete Engine Seal Kit 822278

Vertex

Fits 05-08 Honda Sportrax 400 EX / TRX 09-14 400X Models  Vertex Engine Complete Oil Seal Kit Set Includes: Crankshaft Output Shaft Water Pump ...

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$23.88 - $23.88
$23.88
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$23.88

Honda Sportrax 400EX TRX 400EX 400X Stock Bore 85mm 10:1 Aftermarket Piston Kit

BPRATV

FITS ALL HONDA SPORTRAX TRX 400EX YEARS AND MODELS!!Standard Aftermarket 85mm 10:1 pistonPiston ringsWristpinCirclipsFits all 85mm 400EX cylinders

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$23.88
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