Skip to content
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

Filters

$
$
Save 10% Save %
$999.99
$999.99 - $999.99
$999.99
$899.99
$899.99 - $899.99
$899.99

TRX400EX TRX 400EX Head Cylinder 87 mil Big Bore Kit Cover Top End Rebuild

BPRATV
In stock

FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARS New after-market cylinder head - NO VALVES OR SPRINGS HEAD ONLY Aftermarket cylinder he...

View full details
$999.99
$999.99 - $999.99
$999.99
$899.99
$899.99 - $899.99
$899.99
Save 10% Save %
Save 36% Save %
$4,999.99
$4,999.99 - $4,999.99
$4,999.99
$3,199.99
$3,199.99 - $3,199.99
$3,199.99

99-04 400EX Rebuilt Motor Engine Assembly 87mm Big Bore Ported Assembled Head

BPRATV
Low stock

COMPLETE BUILT BIG BORE MOTOR!Used core bottom end with all BRAND NEW parts listed below87mm big bore cylinder 87mm Wiseco forged piston Piston rin...

View full details
$4,999.99
$4,999.99 - $4,999.99
$4,999.99
$3,199.99
$3,199.99 - $3,199.99
$3,199.99
Save 36% Save %
$1,199.99 - $1,199.99
$1,199.99
$1,199.99 - $1,199.99
$1,199.99

Port 400EX 400X Cylinder Head Ported Porting Assembled Kibblewhite Valves Spring

BPRATV
In stock

Brand new aftermarket cylinder head and valve cover Full race port and polish Intake, exhaust, and combustion chamber Valve guides cut Complete a...

View full details
$1,199.99 - $1,199.99
$1,199.99
$1,199.99 - $1,199.99
$1,199.99
Save 17% Save %
$899.99
$899.99 - $899.99
$899.99
$749.99
$749.99 - $749.99
$749.99

TRX 400EX 400X Cylinder Head Assembly Assembled Head Valves Springs Rocker Arms

BPRATV
In stock

Brand new aftermarket cylinder head and valve cover Complete assembly of both head and valve cover except camshaft Valve springs, retainers, and ...

View full details
$899.99
$899.99 - $899.99
$899.99
$749.99
$749.99 - $749.99
$749.99
Save 17% Save %
Save 8% Save %
$1,199.99
$1,199.99 - $1,199.99
$1,199.99
$1,099.99
$1,099.99 - $1,099.99
$1,099.99

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

BPRATV
In stock

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...

View full details
$1,199.99
$1,199.99 - $1,199.99
$1,199.99
$1,099.99
$1,099.99 - $1,099.99
$1,099.99
Save 8% Save %
Save 11% Save %
$914.99
$914.99 - $914.99
$914.99
$814.99
$814.99 - $814.99
$814.99

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

BPRATV
In stock

Compatible Vehicles Submodel Year Make Model TRX400EX 2x4 2008 Honda Sportrax 400 TRX400EX 2x4 2007 Honda Sportrax 400 TRX400EX 2x4 200...

View full details
$914.99
$914.99 - $914.99
$914.99
$814.99
$814.99 - $814.99
$814.99
Save 11% Save %
$1,099.99 - $1,099.99
$1,099.99
$1,099.99 - $1,099.99
$1,099.99

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

BPRATV
In stock

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...

View full details
$1,099.99 - $1,099.99
$1,099.99
$1,099.99 - $1,099.99
$1,099.99
Sold out
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99

TRX 400EX 400X XR Stock Standard Bore Cylinder Hotcam 85mm Top End Rebuild Kit

BPRATV
Out of stock

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 t...

View full details
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99
Sold out
$449.99 - $449.99
$449.99
$518.88
$518.88 - $518.88
$518.88

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

BPRATV
Low stock

Upgrade Honda TRX400EX, 400X, XR400R with Stage 3 Hot Cams kit featuring Kibblewhite titanium springs, MLS gasket, seals, bearings, and chain. Ho...

View full details
$449.99 - $449.99
$449.99
$518.88
$518.88 - $518.88
$518.88
Save 7% Save %
$946.66
$946.66 - $946.66
$946.66
$878.66
$878.66 - $878.66
$878.66

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

BPRATV
In stock

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...

View full details
$946.66
$946.66 - $946.66
$946.66
$878.66
$878.66 - $878.66
$878.66
Save 7% Save %
Save 15% Save %
$1,000.98
$1,000.98 - $1,000.98
$1,000.98
$850.74
$850.74 - $850.74
$850.74

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

BPRATV
In stock

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

View full details
$1,000.98
$1,000.98 - $1,000.98
$1,000.98
$850.74
$850.74 - $850.74
$850.74
Save 15% Save %
$899.99 - $899.99
$899.99
$899.99 - $899.99
$899.99

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

BPRATV
In stock

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

View full details
$899.99 - $899.99
$899.99
$899.99 - $899.99
$899.99
Sold out
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99

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

BPRATV
Out of stock

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

View full details
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99
Sold out
Save 1% Save %
$472.99
$472.99 - $472.99
$472.99
$469.99
$469.99 - $469.99
$469.99

TRX 400EX 400X XR400 89mm Big Bore Kit Hi Comp Race Gas 12.5:1 440 Rebuild Kit

BPRATV
In stock

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...

View full details
$472.99
$472.99 - $472.99
$472.99
$469.99
$469.99 - $469.99
$469.99
Save 1% Save %
$475.00 - $475.00
$475.00
$475.00 - $475.00
$475.00

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

BPRATV
In stock

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...

View full details
$475.00 - $475.00
$475.00
$475.00 - $475.00
$475.00
Save 8% Save %
$719.99
$719.99 - $719.99
$719.99
$663.99
$663.99 - $663.99
$663.99

TRX 400EX 400X Stage 2 Hotcam Kibblewhite Valve Springs Chain Cam Bearings Kit

BPRATV
Low stock

TRX 400EX 400X Stage 2 Hotcam Kibblewhite Valve Springs Chain Cam Bearings Kit FITS ALL HONDA TRX400EX, 400X, AND XR400R MODELS AND YEARSHotcams S...

View full details
$719.99
$719.99 - $719.99
$719.99
$663.99
$663.99 - $663.99
$663.99
Save 8% Save %
Save 6% Save %
$799.99
$799.99 - $799.99
$799.99
$749.99
$749.99 - $749.99
$749.99

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

Wiseco
In stock

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

View full details
$799.99
$799.99 - $799.99
$799.99
$749.99
$749.99 - $749.99
$749.99
Save 6% Save %
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

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

BPRATV
In stock

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...

View full details
$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 %
Sold out
$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
Out of stock

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

View full details
$165.97 - $165.97
$165.97
$165.97 - $165.97
$165.97
Sold out
$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
In stock

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...

View full details
$999.99 - $999.99
$999.99
$999.99 - $999.99
$999.99
Save 15% Save %
$1,299.99
$1,299.99 - $1,299.99
$1,299.99
$1,099.99
$1,099.99 - $1,099.99
$1,099.99

99-04 TRX 400EX Big Bore 89 mil Complete Rebuilt Motor Engine Rebuild Parts Kit

BPRATV
Low stock

FITS ALL 99-04 HONDA TRX400EX SPORTRAX MODELS NEW 89mm after market cylinder CP JE or Wiseco forged hi comp pump gas piston** Hi temp piston rings ...

View full details
$1,299.99
$1,299.99 - $1,299.99
$1,299.99
$1,099.99
$1,099.99 - $1,099.99
$1,099.99
Save 15% Save %
$1,652.49 - $1,652.49
$1,652.49
$1,652.49 - $1,652.49
$1,652.49

05+ TRX 400EX 400X 89mm Big Bore Rebuild Kit +4 Complete 440 Stage 3 Hotcam

BPRATV
Low stock

FITS ALL '05+ TRX400EX and TRX400X MODELS 89mm after market cylinder Wiseco CP or JE 89mm forged piston**  Nitrite coated piston rings Chrome wris...

View full details
$1,652.49 - $1,652.49
$1,652.49
$1,652.49 - $1,652.49
$1,652.49
Save 2% Save %
$1,229.99
$1,229.99 - $1,229.99
$1,229.99
$1,199.99
$1,199.99 - $1,199.99
$1,199.99

05-14 400EX 400X Big Bore 87mm Hotcams Complete Rebuilt Motor Engine Rebuild Kit

BPRATV
In stock

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

View full details
$1,229.99
$1,229.99 - $1,229.99
$1,229.99
$1,199.99
$1,199.99 - $1,199.99
$1,199.99
Save 2% Save %
Sold out
$839.99 - $839.99
$839.99
$849.98
$849.98 - $849.98
$849.98

TRX 400EX 400X Top End Rebuild Hotcams Valve Springs Complete Stock Cylinder Kit

BPRATV
Out of stock

4606M08500,C7826,1007-1,30-3111,12100-KCY-670, 1043-2, M2002, M2003, M2001,4606M08700,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-...

View full details
$839.99 - $839.99
$839.99
$849.98
$849.98 - $849.98
$849.98
Sold out
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99

99-04 TRX 400EX 400X Complete Rebuilt Bottom End Engine Rebuild Kit 87mm Piston

BPRATV
Low stock

FITS ALL 99-04 HONDA TRX 400EX MODELS Wiseco or Hotrods heavy duty crank with rod** Wiseco or Hotrods crank bearings Wiseco CP or JE 87mm forged h...

View full details
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99

05+ TRX 400EX 400X Complete Rebuilt Bottom End Engine Rebuild Kit 87mm Piston

BPRATV
In stock

FITS ALL '05+ HONDA TRX 400EX 400X MODELS Wiseco or Hotrods heavy duty crank with rod** Wiseco or Hotrods crank bearings Wiseco CP or JE 87mm for...

View full details
$699.99 - $699.99
$699.99
$699.99 - $699.99
$699.99
$199.99 - $199.99
$199.99
$199.99 - $199.99
$199.99

Best 400EX 400X XR400R Red Billet Cam Chain Tensioner Timing Guides Guide Kit

Honda OEM
Low stock

FITS ALL HONDA 400EX 400X AND XR400R MODELS AND YEARS Aftermarket heavy duty timing chain upgrade Red billet cam chain tensioner Chain tensioner g...

View full details
$199.99 - $199.99
$199.99
$199.99 - $199.99
$199.99
Save 7% Save %
$1,499.99
$1,499.99 - $1,499.99
$1,499.99
$1,399.99
$1,399.99 - $1,399.99
$1,399.99

05+ TRX 400EX 400X Big Bore Rebuild Kit 87mm +2 Top Bottom End Stage 2 Hotcam

BPRATV
In stock

FITS ALL HONDA 05+ TRX400EX AND 400X YEARS AND MODELS!  87mm after market cylinder Wiseco or JE forged piston** Hi temp piston rings Chrome wristp...

View full details
$1,499.99
$1,499.99 - $1,499.99
$1,499.99
$1,399.99
$1,399.99 - $1,399.99
$1,399.99
Save 7% Save %
$749.99 - $749.99
$749.99
$749.99 - $749.99
$749.99

05+ 400X 400EX Stroker Rebuild Kit Hotrods +4mm Crank Bottom End Assembly Repair

BPRATV
Low stock

FITS ALL 2005+ HONDA 400EX AND 400X MODELS Hotrods +4mm stroker crankshaft assembly with rod Complete gasket kit MLS head gasket  Oil seal kit  Va...

View full details
$749.99 - $749.99
$749.99
$749.99 - $749.99
$749.99
$849.99 - $849.99
$849.99
$849.99 - $849.99
$849.99

05+ TRX 400X 400EX Stock Rebuilt Motor Engine Bottom End Rebuild Assembly Kit

BPRATV
Low stock

FITS ALL '05+ HONDA 400EX AND 400X MODELS Hotrods or Wiseco HD crankshaft with rod Complete gasket kit MLS head gasket Complete seal kit Valve ste...

View full details
$849.99 - $849.99
$849.99
$849.99 - $849.99
$849.99
$849.99 - $849.99
$849.99
$849.99 - $849.99
$849.99

99-04 TRX400EX TRX 400EX Rebuilt Motor Engine Bottom End Rebuild Assembly Kit

BPRATV
Low stock

FITS ALL '99-04 HONDA 400EX MODELS Hotrods or Wiseco HD crankshaft with rod Complete gasket kit MLS head gasket Complete seal kit Valve stem seals...

View full details
$849.99 - $849.99
$849.99
$849.99 - $849.99
$849.99

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare