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TRX400EX Piston Kits CP Pistons Honda TRX 400 Piston High Compression, Standard Bore and Big Bore TRX 400EX Pistons

Honda TRX 400EX ATV CP Pistons Logo

CP TRX 400 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 TRX400EX four stroke ATV's. Standard bore size and big bore TRX400EX CP Pistons Honda ATV's kits are all available here. 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.

Honda TRX 400ex cp pistons

Standard Features included with each Honda TRX 400EX 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.

1996 - 2009 Honda TRX 400 EX 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 m2003 85mm std. 397 cc 11-1 cp c7825 deglaze cylinder
cp m2004 85mm std. 397 cc 12.5-1 cp c7825 deglaze cylinder
cp m2005 86mm +1mm oversize 407cc 11-1 cp c7825 bore and hone
cp m2006 86mm +1mm oversize 407cc 12.5-1 cp c7825 bore and hone
cp m2007 87mm +2mm oversize 416cc 11-1 cp c7826 bore and hone
cp m2008 87mm +2mm oversize 416cc 12.5-1 cp c7826 bore and hone
cp m2033 89mm +4mm oversize 435cc 11.5-1 cp c7826 bore and hone



The piston and gaskets listed on this page fit the following model year TRX 400EX quads:

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 TRX400EX Honda ATV




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