CP Pistons Honda TRX400EX ATV Piston Kits Standard Bore, Big Bore and
High Compression

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.
CP Pistons racing pistons are used by top
professional riders and teams including:
| Team Suzuki |
Ricky Carmichael |
Ivan Tedesco |
Ryan Dungey |
| MDK Speed |
David Vuillemin |
Nick Wey |
|
| MDK/Lucas Oil/Yamaha |
White Bros. Yamaha |
Rick Ware Racing |
Team Solitaire |

| 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
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 - 2008 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 |
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
TRX400EX Honda ATV
|