Kawasaki EX650 Overbore + 3mm Piston Ceramic Dome Kit/Cylinder/Gaskets 697.06cc
Spears Racing Piston Kits have been winning races and Championships all over the world for over 4 decades. Spears Racing pistons have been in several of the race wins in close course racing and in road circuits in Europe and has won the Isle Of Man TT Twins race several times.
Kawasaki EX650 Overbore + 3mm Piston Ceramic Dome Kit/Cylinder/Gaskets 697.06cc pistons kit is a 13.5 to 1: These pistons are Lateral Gas Ported with large valve pockets for 1mm over valves includes pistons, rings, lighter wrist pins, and cir clips. At the forefront of performance, piston manufacturing has been a result of continuous research and development of unique materials, piston designs and technologies.
Spears Racing has been designing and making race pistons with the State of the Art CNC Machining and manufacturing alliances with JE-Pistons for decades. Spears Racing continuous committed to excellence to advance as the industry changes. This commitment has resulted in more forgings specific to certain applications, proprietary treated wrist pins and piston rings manufactured only for us. Each of these aspects has been put through stringent research and development stages to ensure that our product will exceed your standards.
Spears Racing along with JE-Pistons the piston manufacturing has been a result of continuous research and development both in the dyno room and on the race track winning championships all over the world.
Utilizing State of the Art CNC machines for manufacturing, along with purpose-designed forgings, while being able to maintain exacting specifications on each and every piston – holding tolerances to millionths of an inch. This is the new forging that is lighter than stock OEM Pistons.
The Cylinders are proprietary Nickel Silicon Carbide (NSC) cylinder plating process and cylinder services. This NSC process is so superior to factory plating that Millennium Technologies is often used by professional race teams all over the world to re-plate brand new OEM cylinders. Millennium stands behind their plating with a LIMITED LIFETIME WARRANTY.
Modern engine designs use very light aluminum cylinders. The aluminum base metal is very soft and would wear out almost instantly without a very special protective barrier. The Millennium Technologies Nickel Silicon Carbide (NSC) cylinder plating process forms an extremely hard, extremely durable barrier with less friction, improved heat transfer, less weight, and ultimately more horsepower.
Nickel Silicon Carbide (NSC) plating service includes:
Why Choose Spears Racing? With decades of expertise and a legacy of winning, Spears Racing delivers performance you can trust. Every component in this kit reflects our dedication to quality, precision, and innovation, ensuring your Kawasaki Ninja 500cc performs at its peak.
Unleash the true potential of your bike. Upgrade to the Spears Racing 650cc Overbore Piston Kit today and experience the thrill of race-bred engineering.
A more recent advancement in piston design is lateral (horizontal) gas ports as a standard feature on Spears Racing pistons and an option on many others. This process places gas ports above top of the top ring land to provide combustion pressure access to the back side of the ring. Because these lateral holes are somewhat restricted by the small area above the top ring land, they are not quite as effective but are also not subject to clogging concerns.
Advanced Cylinder Plating
The OEM cylinder is bored, inspected, and coated with a superior NSC plating process by Millennium Technologies, trusted by professional race teams globally. This plating outperforms factory standards and comes with a Limited Lifetime Warranty, ensuring durability under extreme conditions.
JE Pistons’ Thermal Barrier Crown Coating
The kit features JE’s proprietary ceramic gold coating (.0015” thick) on the piston crowns, engineered for unmatched durability and performance:
Heat Reflection: Rejects combustion heat, reducing thermal stress on the piston crown.
Prevents Annealing: Minimizes material softening, extending piston lifespan indefinitely under proper conditions.
Boosts Efficiency: Reflects heat into the combustion chamber, improving exhaust gas velocity and power output.
This coating ensures reliability for high-performance street and track applications, protecting against deformation and material degradation.
Piston Design Features
Spears Racing pistons are engineered for extreme performance, incorporating:
Anti-Detonation Grooves: Reduce piston-cylinder contact at high temperatures and RPMs, protecting the top ring from detonation waves.
Accumulator Groove: V-shaped groove between top and second rings reduces ring flutter, improving seal and longevity.
Double Pin Oilers: Deliver twice the oil to the wrist pin, enhancing lubrication and durability.
Precision Pin Fitting: Honed pin bores with clearances from 0.0003” to 0.003” for optimal performance.
Optimized Cam and Barrel: Custom skirt shapes ensure tighter clearances, less noise, better ring seal, and increased power.
Custom Laser Marking: Each piston is serialized with part number, batch.
Each Kawasaki EX650 Overbore Kit Consist of the Following:
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