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CP Pistons Honda XR400R Dirt bike Piston Kits Standard Bore, Big Bore and High Compression

Honda XR400 Dirtbike CP Pistons Logo

CP XR400 Pistons, for those that demand the ultimate in engine performance!

High performance and racing Honda piston kits are available from CP Pistons for all model years of the XR400R four stroke dirt bikes. Standard bore size and big bore XR400 CP Pistons Honda dirt bike kits are all available here as well as high compression pistons.. These forged pistons will work with oversize valves as well as high lift camshafts as they include oversize valve reliefs. They incorporate a "X" style forging for greater strength, durability and reduced weight. Along with the full radius dome designs, high performance piston rings and lightweight piston pins, these pistons offer the highest quality and are engineered for maximum power output.

CP Pistons racing pistons are used by top professional riders and teams

Honda XR400 cp pistons

Standard Features included with each Honda XR 400R CP Piston Kit:
Double forced pin oilers Fully CNC Machined
Accumulator groove Pick lock removal grooves
Anti detonation grooves X-style forging
Light weight pins Balanced to + or - 1 gram

Each of the below kits include:
Piston Pin
Piston Rings
Pin Locks

Cometic top end gasket sets are available separately, but are not included with the piston kit. The matching top end gasket kit for each application is listed in the table below, when available, along with the individual piston kit info.

Click on the part number in the table below for pricing or to order the piston and, or head gasket of your choice.

1996 - 2009 Honda XR400R CP Piston Kit

Stock Bore size is 85mm (3.346") Stock Stroke is 70mm (2.755")

Part # Bore Size Cubic
Compression Top End Gasket Kit # Installation
cp m2003xr 85mm std. 397 cc 11-1 cp c7825xr deglaze cylinder
cp m2004xr 85mm std. 397 cc 12.5-1 cp c7825xr deglaze cylinder
cp m2005xr 86mm +1mm oversize 407cc 11-1 cp c7825xr bore and hone
cp m2006xr 86mm +1mm oversize 407cc 12.5-1 cp c7825xr bore and hone
cp m2007xr 87mm +2mm oversize 416cc 11-1 cp c7826xr bore and hone
cp m2008xr 87mm +2mm oversize 416cc 12.5-1 cp c7826xr bore and hone
cp m2033xr 89mm +4mm oversize 435cc 11.5-1 cp c7826xr bore and hone


The piston and gaskets listed on this page fit the following model year XR400 Dirt Bikes:

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Honda XR400 Piston Kit


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