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SHIPPING UPDATE: Due to high demand, orders are currently processing in 5-7 business days. Need it faster? Contact us to upgrade to expedited shipping! If you’ve found the item elsewhere or can’t wait, no problem—we completely understand. Just reach out to us, and we’ll cancel your order. Thanks for your patience and support! BRAPPPPPPPPPP!

Honda TRX400EX

Honda 400EX Rebuild Kits, Pistons, and Parts

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$699.98

05+ Honda 400EX 400X 87mm 416 Big Bore Cylinder Wiseco Piston Engine Rebuild Kit

BPRATV

WPC131B, 4606M08700, C7826, K014, B5047,4040, C7825, 808894, 822278, 4040, CBK0016, C7826, 12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673...

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$386.78
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$298.88
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$298.88

Honda 400X 400EX XR 400R Top End Cylinder Top Rebuild Kit 10.5 JE Piston Gaskets

BPRATV

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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$298.88
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$298.88
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$298.88

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

BPRATV

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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$298.88
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$386.78
$298.88
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$298.88

TRX400EX 400EX 400X 85mm Bore Cylinder JE Piston Cometic Gaskets Top Rebuild Kit

BPRATV

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

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

BPRATV

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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$304.88
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$304.88
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$304.88
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$304.88

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

BPRATV

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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$499.99
$319.98
$319.98 - $319.98
$319.98

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

BPRATV

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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$319.98
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$319.98
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$319.98
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$319.98

TRX400EX 400X 89mm Big Bore Cylinder 10.8 JE Piston Cometic Top End Rebuild Kit

BPRATV

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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$319.98
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$461.99
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$389.88
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$389.88

TRX 400EX 400X XR400 Stock Bore Cylinder 85mm Rebuilt Top End Rebuild Kit Parts

BPRATV

M2002,4606M08500,12100-KCY-670, 4606M08500, C7825, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-670, 13111-KCY-670, 12...

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$389.88
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$389.88
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$418.22
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$418.22
$274.99
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$274.99

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

Kibblewhite Precision

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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$274.99
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$274.99
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$418.22
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$418.22
$274.99
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$274.99

Honda TRX400EX TRX 400EX Kibblewhite Intake Exhaust Valves Guides Seals Springs

Kibblewhite Precision

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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$1,299.99
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$1,299.99
$1,099.99
$1,099.99 - $1,099.99
$1,099.99

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

BPRATV

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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$1,299.99
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$699.99
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$699.99
$599.99
$599.99 - $599.99
$599.99

TRX400EX TRX 400X XR400 87mm Big Bore 11:1 High Comp Piston Stage 2 Hot Cam Kit

BPRATV

Best Honda TRX400EX Big Bore Top End Rebuild Kit Online, 1043-2, M2008, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, ...

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$699.99
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$599.99
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$334.75
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$334.75
$279.98
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$279.98

Honda TRX 400EX XR400R 400X 87mm 415cc CP Carrillo CP Piston Kit 12.5:1 CR M2008

CP-Carrillo

M2008, 3465XC, 4606M08800, 4628M08800, XC8800, 177240, 8604D300, 90601-KA5-000, 13103-KCY-670, 13111-KCY-670, 12251-HN1-003, 12209-KL4-005, 810829,...

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$279.98
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$398.89
$398.89 - $398.89
$398.89

BEST Honda TRX400EX TRX 400EX Complete ASSEMBLED Cylinder Head Kit 12200-KCY-670

BPRATV

>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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$398.89
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$398.89

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

BPRATV

>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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$398.89
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$888.89
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$888.89
$688.89
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$688.89

Honda TRX 400EX Assembled Cylinder Head Stage 2 Hot Cams Chain Big Bore Cometic

BPRATV

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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$688.89
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$688.89

Honda TRX 400EX Assembled Cylinder Head Stage 3 Hot Cams Chain Big Bore Cometic

BPRATV

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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$688.89
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$688.89

400EX 400X XR400R Assembled Cylinder Head Stage 2 Hot Cams Chain Cometic Gasket

BPRATV

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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$888.89
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$688.89
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$909.99
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$909.99
$638.89
$638.89 - $638.89
$638.89

Honda TRX400EX Assembled Cylinder Head Stage 2 Hot Cams Chain Cometic Gasket Kit

BPRATV

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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$909.99
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$638.89
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$909.99
$638.89
$638.89 - $638.89
$638.89

400EX 400X XR400R Cylinder Head Stage 2 Hot Cams Chain & Cometic Top End Gasket

BPRATV

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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$909.99
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$909.99
$638.89
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$638.89
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$909.99
$909.99 - $909.99
$909.99
$638.89
$638.89 - $638.89
$638.89

Honda TRX 400EX Assembled Cylinder Head Stage 2 Hot Cams Chain 87 88 89 Cometic

BPRATV

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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$909.99
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$909.99
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$638.89
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$909.99
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$909.99
$638.89
$638.89 - $638.89
$638.89

400EX 400X XR400R Cylinder Head Stage 2 Hot Cams Chain & Big Bore Cometic Gasket

BPRATV

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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$909.99
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$638.89
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$919.89
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$919.89
$649.89
$649.89 - $649.89
$649.89

Honda TRX400EX Assembled Cylinder Head Stage 2 Hot Cams WISECO Chain Cometic MLS

BPRATV

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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$919.89
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$919.89
$649.89
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$649.89
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$919.89
$919.89 - $919.89
$919.89
$649.89
$649.89 - $649.89
$649.89

TRX400EX 400EX Cylinder Head Stage 2 Hot Cams WISECO Chain Big Bore Cometic Kit

BPRATV

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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$919.89
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$919.89
$649.89
$649.89 - $649.89
$649.89
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$919.89
$919.89 - $919.89
$919.89
$649.89
$649.89 - $649.89
$649.89

Honda TRX400EX Assembled Cylinder Head Stage 2 Hot Cams WISECO Chain Cometic Kit

BPRATV

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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$919.89
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$919.89
$649.89
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$649.89
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$919.89
$919.89 - $919.89
$919.89
$649.89
$649.89 - $649.89
$649.89

TRX400EX 400EX Cylinder Head Stage 2 Hot Cams WISECO Chain Stock Cometic Gasket

BPRATV

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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$919.89
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$919.89
$649.89
$649.89 - $649.89
$649.89
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$919.89
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$919.89
$649.89
$649.89 - $649.89
$649.89

400EX 400X XR400R Cylinder Head Stage 2 Hot Cams WISECO Chain & 87 88 89 Cometic

BPRATV

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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$919.89
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$919.89
$649.89
$649.89 - $649.89
$649.89
Save 29% Save %
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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
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$1,419.99
$1,199.99
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$1,199.99
Save 15% Save %
Save 28% Save %
$257.75
$257.75 - $257.75
$257.75
$184.88
$184.88 - $184.88
$184.88

Honda TRX 400EX 400X 85mm Stock Bore 10:1 Piston Cometic MLS 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
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$257.75
$184.88
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$184.88
Save 28% Save %
Save 14% Save %
$97.66
$97.66 - $97.66
$97.66
$84.07
$84.07 - $84.07
$84.07

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

Kibblewhite Precision

30-33750, 90085-KCY-670, 90083-KG0-981Brand New Kibblewhite Extreme Heavy Duty Head Stud Kit Honda® TRX 400X/EX 1999-2014 & XR400R 1996-20004 ...

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$97.66
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$97.66
$84.07
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$84.07
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$499.99
$499.99 - $499.99
$499.99
$399.99
$399.99 - $399.99
$399.99

TRX 400EX 400X XR400R Stage 1 Hot Cams Valves Springs Complete Head Rebuild Kit

Hot Cams

1007-1,3P-HRK,14775-KCY-670,90544-KF0-000,91002-MN1-671FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARSStage 1 Hot Cams CamshaftSKF OEM U...

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$499.99
$399.99
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$399.99
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$1,445.99
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$1,445.99
$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

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

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$1,445.99
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$1,445.99
$1,299.99
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$1,299.99
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$559.95
$559.95 - $559.95
$559.95
$511.16
$511.16 - $511.16
$511.16

Honda TRX400EX Stroker Crank Bearings Hot Rods 4 mil +4mm Crankshaft Rod Bearing

Hot Rods

4240.13000-HN1-000,13000-MBV-730,CBK0037,91001-KF0-018WORKS ON ALL HONDA 400EX AND 400X MODELS AND YEARS!!Hot Rods Part# 4240Hot Rods +4mm stroker ...

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$559.95
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$559.95
$511.16
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$511.16
Save 9% Save %
Save 25% Save %
$305.44
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$305.44
$229.98
$229.98 - $229.98
$229.98

Honda 400EX XR 400X Wiseco 88mm BIG BORE 11:1 Piston COMETIC Top End Gasket Kit

Wiseco

Honda TRX 400EX 426cc Wiseco 88mm Big Bore 11:1 Compression Piston & Cometic Top End Gasket KitFits Honda TRX 400EX & 400XYears 1999 2000 2...

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$305.44
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$305.44
$229.98
$229.98 - $229.98
$229.98
Save 25% Save %
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TRX 400EX 400X Stroker Crank Hotrods 4mm Stroke Crankshaft & Main Crank Bearings

Hot Rods

4240.13000-HN1-000,13000-MBV-730,CBK0037,91001-KF0-018WORKS ON ALL HONDA 400EX AND 400X MODELS AND YEARS!!Hot Rods Part# 4240Hot Rods +4mm stroker ...

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$559.95
$559.95 - $559.95
$559.95
$511.16
$511.16 - $511.16
$511.16
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