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CP Pistons Kawasaki KLX400 Dirt Bike Piston Kits Standard Bore, Big Bore and High Compression Piston

Kawasaki KLX400 CP Pistons Logo

CP Pistons, the best pistons for those that demand the ultimate in engine performance!

KLX400 high performance and racing forged piston kits are available here for the KLX400 off road dirt bikes. Standard bore size and big bore 434cc and 450cc KLX400 CP Pistons Kawasaki kits and high compression KLX 400 piston 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 2003 - 2006 Kawasaki KLX400 Piston Kits

Stock Standard Bore size is 90mm (3.543") Stock Stroke is 62.4mm (2.464")

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, along with the individual piston kit info.

Part # Bore Size Size Compression Top End Gasket Kit # Installation
Piston Kit Price
cp m4028 90mm std. 398 cc 12.5-1 e-mail us deglaze cylinder
Add To Cart
cp m3003 +4mm 94mm big bore 434cc 12.5-1 cp c7806 bore and replate
Add To Cart
cp m3004 +5mm 95mm big bore 450 cc 12.5-1 cp c7980 bore and replate
Add To Cart

Installation Notes:

  • Deglaze Cylinder When replacing a piston with the same stock bore size as the original factory stock size you do not need to have your cylinder modified. We do recommend that you deglaze the cylinder. This involves running a hone through the cylinder to remove glazing and provide the best possible surface for piston ring seal. This will improve power and piston and ring life.
  • Bore and Replate Cylinder When installing an oversize, big bore piston, the cylinder must be bored to the correct new bore size to allow installation of your oversize piston. The cylinder then must be re-plated and finish honed to provide the proper surface for your piston and rings to work in, and provide best power and longevity. 
Kit Contents
Standard Features included in Kawasaki KLX400 CP Piston Kit:
Double forced pin oilers
Fully CNC machined
Piston Pin
Accumulator groove
Pin lock removal grooves
Piston Rings
Anti detonation grooves
X-style forging
Pin retaining locks
Light weight piston pin
Balanced to + or - 1 gram
CP Pistons Kawasaki KFX450 Piston FULL RACE Model M4025 Top View
Kawasaki KFX 450 CP Forged Piston Bottom View

FULL RACE upgraded model piston shown in pictures.


The piston and gaskets listed on this page fit the following model year Kawasaki KLX400 Dirt Bike:

2003 2004 2005 2006 KLX400



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