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CP Pistons Honda TRX 300EX Piston Kits Standard Bore and Big Bore TRX300EX Piston Kits

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 TRX 300EX 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.

Honda TRX 300ex cp pistons

Standard Features included with each CP Pistons Honda TRX 300 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.

CP Pistons 1992 - 2009 Honda TRX 300 EX Piston Kits

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

Piston # Bore Size Cubic
Compression Top End Gasket Kit # Installation

cp m2039

74mm std. 282 cc 11.5-1 cp c7143est deglaze cylinder
cp m2040 75mm +1mm
289 cc 11.5-1 cp c7143est bore and hone
cp m2041 76mm +2mm
297cc 11.5-1 cp c7906est bore and hone

The piston and gaskets listed on this page fit the following model year TRX 300EX quads:

1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 TRX300EX Honda ATV





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