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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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Honda 400EX 400X Top End Rebuild Cylinder Head Valve Cover Stock Upper Assembly

BPRATV

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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TRX 400EX 400X XR 89 mil Big Bore Kit +4 Cylinder Hi Comp Top End Rebuild Hotcam

BPRATV

FITS ALL HONDA 400EX 400X XR400 MODELS AND YEARS NEW aftermarket 89mm big bore cylinder Wiseco or CP forged piston** The piston is hi c...

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$649.99
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Honda 400EX 400X Port Ported Head Porting Assembly Assembled Kibblewhite Valves

BPRATV

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

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TRX 400EX 400X XR 88m Big Bore Kit Stage 3 Hotcam Hot Cam +3 Top End Rebuild Kit

BPRATV

Compatible Vehicles Submodel Year Make Model TRX400EX 2x4 2008 Honda Sportrax 400 TRX400EX 2x4 2007 Honda Sportrax 400 TRX400EX 2x4 2...

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$699.99 - $699.99
$699.99
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Honda 400EX 400X 88mm Rebuild Kit Top Bottom Big Bore Motor Engine Assembly 426c

BPRATV

WORKS ON ALL 2005+ HONDA 400EX AND 400X MODELS Aftermarket 88mm big bore cylinder 88mm big bore Wiseco JE or CP forged piston* Nitrite coated pisto...

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$1,099.99 - $1,099.99
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TRX 400EX 400X XR Stock Standard Bore Cylinder Hotcam 85mm Top End Rebuild Kit

BPRATV

FITS ALL HONDA 400EX 400X XR400 MODELS AND YEARS NEW aftermarket cylinder Wiseco JE or CP forged piston** Piston is hi comp pump gas version Hi ...

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$599.99 - $599.99
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TRX 400EX 400X Black Billet Chain Tensioner Cam Timing Guides Guide Set Complete

BPRATV

FITS ALL HONDA 400EX 400X AND XR400R MODELS AND YEARSOne after market timing chainOEM Honda guideOEM Honda tensioner guideBlack billet cam chain te...

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TRX 400EX 400X Stage 3 Three Hotcam Hot Cam Kibblewhite Valve Springs Complete

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARSStage 3 HotcamKibblewhite race valve spring kit Viton valve stem seals Big bore top end g...

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TRX 400EX 400X Stage 1 Hotcam Kibblewhite Valve Springs Head Rebuild Redo Kit

BPRATV

FITS ALL HONDA 400EX 400X AND XR400R MODELS AND YEARS - THE ONLY TRULY COMPLETE REBUILD KIT ONLINE Stage 1 Hotcam SKF cam bearings Kibblewhite st...

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$649.99
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TRX 400EX 400X XR 87m Big Bore Kit Stage 2 Hotcam Hot Cam +2 Top End Rebuild Kit

BPRATV

FITS ALL HONDA 400EX 400X XR400 MODELS AND YEARS NEW aftermarket 87mm cylinder Wiseco JE or CP forged big bore piston** Hi-temp pist...

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$866.65
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TRX 400EX 400X Cylinder Head Valves Assembled Kibblewhite Valve Springs Rockers

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS NEW after market cylinder head and valve cover Complete head assembly Kibblewhite valve ...

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Honda TRX 400EX 87mm Big Bore Kit Stage 2 Webcam Web Cam Top End Race Spring Kit

BPRATV

FITS ALL HONDA TRX400EX, XR400, AND 400X YEARS AND MODELS!  New aftermarket 87mm cylinder Wiseco forged big bore piston** Piston rings Wristpin ...

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$359.99
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TRX 400EX 400X Stage 2 Two Hotcam Hot Cam Kibblewhite Valve Springs Complete Kit

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARSStage 2 HotcamKibblewhite race valve spring kit Viton valve stem seals Big bore top end g...

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$359.99 - $359.99
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TRX400 400EX 400X Stock Cylinder 85m Complete Top End Rebuild Stage 1 Hotcam Kit

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS   - 85mm after market cylinder  - 85mm JE CP or Wiseco forged piston**  - Piston rings  ...

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$599.99 - $599.99
$599.99
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Honda 400EX 400X 89mm Rebuild Kit Top Bottom Big Bore Motor Engine Assembly 440c

BPRATV

WORKS ON ALL 2005+ HONDA 400EX AND 400X MODELS Aftermarket 89mm big bore cylinder 89mm big bore Wiseco JE or CP forged piston* Nitrite coated pisto...

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$1,099.99 - $1,099.99
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Save 1% Save %
$472.99
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TRX 400EX 400X XR400 89mm Big Bore Kit Hi Comp Race Gas 12.5:1 440 Rebuild Kit

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS NEW after market 89mm cylinder Wiseco CP or JE forged piston** Hi temp piston rings Wri...

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$472.99
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$469.99
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$475.00 - $475.00
$475.00
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TRX 400EX 400X XR400 87mm Big Bore Kit Hi Comp Race Gas 12.5:1 416cc Rebuild Kit

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS NEW after market 87mm cylinder CP or JE forged RACE GAS ONLY piston** Hi temp piston ri...

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$475.00 - $475.00
$475.00
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$475.00
$459.99 - $459.99
$459.99
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TRX 400EX 400X Stage 2 Hotcam Kibblewhite Valve Springs Chain Cam Bearings Kit

BPRATV

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS Hotcams Stage 2 camshaft Cam bearings Kibblewhite race valve spring kit BASE WASHERS N...

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$604.99
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TRX 400EX 400X 87mm Big Bore Cylinder +2 Top End 87 mil Complete Assembly Kit

BPRATV

Compatible Vehicles Submodel Year Make Model TRX400EX 2x4 2008 Honda Sportrax 400 TRX400EX 2x4 2007 Honda Sportrax 400 TRX400EX 2x4 20...

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$604.99
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TRX 400EX 400X XR400R Stock Bore Cylinder 85m Top End Rebuild Stage 2 Cam Kit

BPRATV

ARE YOU A SHOP OR DEALER?  DO YOU WORK ON BIKES FOR A LIVING?  IF SO CONTACT US ABOUT A DEALER ACCOUNT THAT WILL SAVE YOU MONEY ON EVERY JOB! FITS...

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TRX 400EX 400X XR 88m Big Bore Stage 3 Hotcam Valve Springs +3 Top End Kit 426cc

BPRATV

Compatible Vehicles Submodel Year Make Model TRX400EX 2x4 2008 Honda Sportrax 400 TRX400EX 2x4 2007 Honda Sport...

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$775.00 - $775.00
$775.00
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TRX 400X 400EX Stock Bore Cylinder Head Valve Cover Standard 85mm Top End Kit

Wiseco

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS Brand new aftermarket cylinder head - NO VALVES OR SPRINGS HEAD ONLY Cylinder head val...

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$29.99
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01-08 Honda Sportrax 400 TRX 400EX Big Bore 89mm 9:3.1 Aftermarket Piston Kit

BPRATV

FITS ALL HONDA SPORTRAX TRX 400EX YEARS AND MODELS!! BUY IN BULK AND SAVE!! Big Bore Aftermarket 89mm 10:1 piston Piston rings Wristpin Circlips ...

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05+ 400EX 400X 87mm Big Bore Rebuild Kit Top Bottom End Motor Engine Repair Redo

BPRATV

Works on all 2005+ Honda 400EX and 400X models 87mm big bore cylinder 87mm big bore Wiseco or Wossner forged piston Nitrite-coated piston rings C...

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$1,799.99
$1,799.99 - $1,799.99
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99-04 400EX 88mm Big Bore Rebuild Kit Top Bottom End Motor Engine Repair Redo

BPRATV

Works on all '99-04 Honda 400EX models 88mm big bore cylinder 88mm 10:1 big bore Wiseco or Wossner forged piston Nitrite-coated piston rings Chro...

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$1,799.99
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$149.99
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400X 400EX Titanium Cylinder Head Studs Ti Stud Upgrade Performance Kit Set

BPRATV

All Grade 5 Titanium alloy stud and nut kit No case or cylinder machining required Heat treated, allen head studs 12 point flange nuts and 3mm wa...

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$149.99
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05+ 400EX 400X Complete Motor Engine Cylinder Head Rebuilt Rebuild Assembly Kit

BPRATV

Works on all 2005+ Honda 400EX and 400X models 85mm stock bore cylinder 85mm stock bore Wiseco or Wossner forged piston Nitrite-coated piston rin...

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$1,799.99
$1,799.99 - $1,799.99
$1,799.99
$1,699.99
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$1,699.99
Save 6% Save %
$1,599.99 - $1,599.99
$1,599.99
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$1,599.99

05+ 400EX 400X 87mm Big Bore Complete Motor Engine Cylinder Head Rebuild Kit

BPRATV

Works on all 2005+ Honda 400EX and 400X models 87mm cylinder 87mm big bore Wiseco or Wossner forged piston Nitrite coated piston rings Chrome wri...

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$1,599.99 - $1,599.99
$1,599.99
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$1,599.99
Save 12% Save %
$249.99
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$219.99
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$219.99

400X 400EX Titanium Cylinder Head Exhaust Studs Crankcase Manifold Ti Stud Kit

BPRATV

Kit includes studs and nuts for: cylinder to cases, cylinder head, exhaust head pipes All Grade 5 Titanium alloy stud and nut kit No case or cyli...

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$249.99
$249.99 - $249.99
$249.99
$219.99
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$219.99
Save 12% Save %
$199.99 - $199.99
$199.99
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$199.99

Best 400EX 400X Black Billet Cam Chain Tensioner Heavy Duty Chain OEM Guides Kit

Honda OEM

Talon heavy duty conversion timing chain Black billet cam chain tensioner Chain tensioner gasket OEM Honda cam chain guides Works on all Honda 4...

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$199.99 - $199.99
$199.99
$199.99 - $199.99
$199.99
$165.97 - $165.97
$165.97
$165.97 - $165.97
$165.97

Honda 400EX 400X +1mm Over Piston Wiseco 4606M08600 86mm Piston Top End Gaskets

BPRATV

Works on all Honda 400EX, 400X, and XR400R models and years Wiseco 86mm forged piston Nitrite coated piston rings Chrome wristpin Circlips Top en...

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$165.97 - $165.97
$165.97
$165.97 - $165.97
$165.97
Save 6% Save %
$1,799.99
$1,799.99 - $1,799.99
$1,799.99
$1,699.99
$1,699.99 - $1,699.99
$1,699.99

99-04 Honda 400EX Cylinder Head Complete Top Bottom End Rebuild Kit Assembly Kit

BPRATV

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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$1,799.99
$1,799.99 - $1,799.99
$1,799.99
$1,699.99
$1,699.99 - $1,699.99
$1,699.99
Save 6% Save %
$849.99 - $849.99
$849.99
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$849.99

400EX 400X Cylinder Head Stage 2 Cam Assembled Head Assembly Camshaft Gasket Kit

BPRATV

Brand new aftermarket cylinder head and valve cover Complete assembly of both head and valve cover  Valve springs, retainers, and seats Intake an...

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$849.99 - $849.99
$849.99
$849.99 - $849.99
$849.99
Save 24% Save %
$461.99
$461.99 - $461.99
$461.99
$349.99
$349.99 - $349.99
$349.99

400EX 400X XR400 Top End Rebuild Kit Stock Cylinder Piston Upper Assembly Parts

BPRATV

Works on all Honda 400EX 400X and XR400R models and years NEW aftermarket cylinder Forged Wiseco or Wossner piston** Hi temp piston rings Chrome w...

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$461.99
$461.99 - $461.99
$461.99
$349.99
$349.99 - $349.99
$349.99
Save 24% Save %
Save 1% Save %
$202.39
$202.39 - $202.39
$202.39
$199.99
$199.99 - $199.99
$199.99

05+ 400X 400EX OEM Cam Chain Guides 400X Black Billet Tensioner HD Chain Ti Bolt

Honda OEM

WORKS ON ALL HONDA 400EX 400X AND XR400R MODELS AND YEARS OEM Honda front and rear chain guides Black billet cam chain tensioner Grade 5 Tita...

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$202.39
$202.39 - $202.39
$202.39
$199.99
$199.99 - $199.99
$199.99
Save 1% Save %
$999.99 - $999.99
$999.99
$999.99 - $999.99
$999.99

05+ TRX 400EX 400X Big Bore Rebuild Kit 87mm +2 Engine Motor Redo Assembly Parts

BPRATV

FITS ALL 05+ HONDA TRX400EX AND TRX400X MODELS NEW 87mm after market cylinder CP JE or Wiseco forged piston** Hi temp piston rings Wristpin Circlip...

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$999.99 - $999.99
$999.99
$999.99 - $999.99
$999.99

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