Cometic Top End Gasket Kits for stock and big bore piston engine applications are the standard for Honda XR, CRF, TRX dirt bike and ATV motors and includes top and base gaskets. FITS: Honda XR400R / TRX400EX S/S Head BORE SIZE: 89mm
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PART PRICE: $32.10

PART NUMBER: COM-C7826

The Falicon Connecting Rod is one of the best connecting rods you can connect to an OEM or big bore performance piston. Because of its unique Knife design, the dynamics and weight factor increase performance and longevity. FITS: Honda TRX400EX
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PART PRICE: $199.95

PART NUMBER: FR-CR-1H-EX

Honda Geniune Parts - Engine Oil Filter - FITS: Honda XR250R / XR350R / XR400R / XR500 / XR600R / XR650L / XR650R / TRX400EX / XR250L / XL250 / XL350 / XL600
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PART PRICE: $8.00

PART NUMBER: HO-15410-KF0-305

The Hot Cams Cam Shaft Installation Kit includes a degree wheel, dial indicator with long and short reach studs, adjustable magnetic stand, three positive stops (10mm, 12mm, 14mm threads) and a wooden carrying case. Install a cam with ease.
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PART PRICE: $129.95

PART NUMBER: HC-CIK-001

The Hot Cams Stage 1 Cam increases midrange and top end power for XR / TRX dirt bikes / ATVs. The cam shaft is not recommended for big bore applications over 426cc. Retains use of the stock OEM valve springs and rockers. FITS: Honda TRX400EX / XR400R
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PART PRICE: $189.95

PART NUMBER: HC-1007-1

The Hot Cams Stage 2 Cam ignites the top end power for superior motocross and desert racing applicaitons. The ATV / dirt bike cam shaft retains the use of the stock OEM valve springs and rockers. FITS: Honda TRX400EX / XR400R
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PART PRICE: $189.95

PART NUMBER: HC-1043-2

The Hot Cams Stage 3 Cam dramatically increases TRX / XR engine performance and is recommended for big bore stroker applications. The cam shaft does not use the decompression mechanism and retains use of stock valve springs and rockers. FITS: Honda TRX400
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PART PRICE: $189.95

PART NUMBER: HC-1008-2

The Hot Rods answer to big bore performance is its 89mm bore 460cc displacement Hot Rods ATV Stroker Piston for the TRX400EX. FITS: Honda TRX400EX
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PART PRICE: $255.95

PART NUMBER: HR-P4001

At performance minded alternative to stock replacement parts, the Hot Rods dirt bike and ATV connecting rod kit comes complete with a new rod, bearing, wrist pin and thrust washers. FITS: Honda XR400R / TRX400EX
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PART PRICE: $137.22

PART NUMBER: HR-8124

At performance minded alternative to stock replacement parts, the Hot Rods dirt bike and ATV connecting rod kit comes complete with a new rod, bearing, wrist pin and thrust washers. FITS: Honda TRX400EX
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PART PRICE: $137.22

PART NUMBER: HR-8609

The Hot Rods Stroker ATV crankshaft produces big power with fast and simple installation by avoiding additional machine work and parts typically required for long-stroke engines. FITS: Honda TRX400EX
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PART PRICE: $389.50

PART NUMBER: HR-4140

We use this K&N Air Filter as a Crank Case Breather Filter in the XR's Only Crankcase Breather Filter Kit. With the addition of this filter, there's not need to worry about sucking dirty air into your crankcase and cause catostrophic damage to your engi
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PART PRICE: $24.95

PART NUMBER: KN-62-1100

K&N filters contain synthetic filter media, designed for ultimate flow, yet engineered for outstanding filtration. FITS: Honda TRX300EX / TRX400EX / TRX350 Rancher / TRX450 Foreman / TRX500 Foreman / ATC250SX / ATC350X
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PART PRICE: $6.00

PART NUMBER: KN-113