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TRX400EX Piston Kits CP Pistons Honda TRX 400 EX ATV Piston Kits High Compression, Standard Bore and Big Bore TRX400 EX Pistons

CP 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.

Each of the below kits include:
Piston
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 TRX400EX CP Piston Kit Stock Bore size is 85mm (3.346") Stock Stroke is 70mm (2.755")
Part #	Bore Size	Cubic Centimeters	Compression	Top End Gasket Kit #	Installation Notes
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

 

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The piston and gaskets listed on this page fit the following model year TRX400EX quads:

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

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