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CP Pistons Honda TRX300EX ATV Piston Kits Standard Bore, Big Bore and High Compression

Honda TRX 300EX ATV CP Pistons Logo

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 TRX300EX four stroke ATV's. Standard bore size and big bore TRX300EX 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

Honda TRX 300ex cp pistons

Standard Features included with each Honda TRX 300EX 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.

1992 - 2008 Honda TRX300EX CP Piston Kit

Stock Bore size is 74mm (2.913") Stock Stroke is 65.5mm (2.579")

Part # Bore Size Cubic
Centimeters
Compression Top End Gasket Kit # Installation
Notes
cp m2039 74mm std. 282 cc 11.5-1 cp c7143est deglaze cylinder
cp m2040 75mm +1mm
oversize
289 cc 11.5-1 cp c7143est bore and hone
cp m2041 76mm +2mm
oversize
297cc 11.5-1 cp c7522 bore and hone

The piston and gaskets listed on this page fit the following model year TRX300EX quads:

1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 TRX300EX Honda ATV