Kawasaki EX/ER650 Overbore + 3mm Street Version Piston Ceramic Dome Kit/Cylinder/Gaskets 697.06cc

3mm Street Version Piston Ceramic Dome Kit/Cylinder/Gaskets 697.06cc 12.5:1 Compression  Ceramic Dome Coated JE Pistons Spears Racing + JE Pistons — Race-proven big-bore performance for the Kawasaki EX650 / ER650 platform. Take your Ninja 650 from 649cc to a potent 697cc with this complete overbore kit. Designed and manufactured in collaboration with JE Pistons, this kit delivers serious power gains while maintaining reliability for both street and track use.

Key Specifications

• Displacement: 697.06cc (stock 649cc)
• Bore Increase: +3mm over stock
• Compression Ratio: 12.5:1
• Pistons: JE forged pistons by Spears Racing
• Coating: JE Thermal Barrier Ceramic Crown Coating (gold, 0.0015″ thick)
• Valve Pockets: Large pockets for up to 1mm oversized valves
• Gas Ports: Lateral (horizontal) gas ports
• Cylinders: OEM cylinders bored and professionally plated with Nickel Silicon Carbide (NSC) by Millennium Technologies
• Warranty: Limited Lifetime Warranty on NSC plating

Why This Kit Stands Out

• Lateral gas ports for improved ring seal and combustion pressure behind the top ring
• Anti-detonation grooves to protect the top ring land
• Accumulator groove to reduce ring flutter
• Double pin oilers for superior wrist-pin lubrication
• Optimized skirt design for tighter clearances, reduced noise, and better ring seal
• Precision-honed pin bores and custom wrist pins

JE Ceramic Dome Coating
The proprietary gold ceramic coating on the piston crowns:

• Reflects combustion heat away from the piston
• Reduces thermal stress and prevents annealing
• Improves combustion efficiency and exhaust gas velocity
• Extends piston life under high-performance conditions

Premium NSC Cylinder Plating (Millennium Technologies)
Your OEM cylinders are bored, stripped, and coated with Nickel Silicon Carbide (NSC) plating — the same process trusted by professional race teams worldwide. Benefits include:

• Extremely hard, wear-resistant surface
• Lower friction
• Superior heat transfer
• Reduced weight compared to traditional plating
• Limited Lifetime Warranty on the plating

Lighter & Stronger Forgings
These pistons use purpose-designed forgings that are lighter than stock OEM pistons while maintaining exceptional strength.

Kit Contents

• 2 × Matched JE/Spears Racing overbore pistons (ceramic coated)
• Piston rings (top, second, and oil control)
• Lighter wrist pins + circlips
• Bored & NSC-plated OEM cylinders (matched set)
• Custom head gasket
• Custom base gasket

• Installation guidelines (SP700-Kaw-JE PDF)

Why Choose Spears Racing?

With decades of experience building championship-winning race pistons in partnership with JE Pistons, Spears Racing delivers components engineered for real-world performance. Every piston is CNC-machined to millionths-of-an-inch tolerances using the latest forgings and proprietary treatments.

Perfect For

• Track days and club racing
• High-performance street builds
• Minitwin / lightweight class racing
• Riders wanting significant power gains without a full engine rebuild

Note: This is 697.06cc performance upgrade. Professional installation, proper engine tuning, and high-octane fuel are strongly recommended. Supporting modifications (exhaust, intake, cams, valves, etc.) may be required to realize full potential.