Engine Performance

The 649cc parallel-twin engine that powers the Kawasaki ZX-4R is designed to provide exceptional power and performance. The engine’s bore measures 67 mm, while its stroke measures 49.5 mm. This combination allows for a compression ratio of 12:1, which enables the engine to produce a significant amount of power.

The engine produces **72 horsepower at 10,000 rpm** and 43 lb-ft of torque at 8,000 rpm. This power output is made possible by the use of lightweight pistons, forged connecting rods, and a digital fuel injection system. The fuel injection system features dual injectors per cylinder, which provide a high level of precision and control.

The engine’s parallel-twin design allows for a compact and narrow shape, making it easier to handle and maneuver. Additionally, the engine’s low center of gravity provides improved stability and handling. Overall, the Kawasaki ZX-4R’s 649cc parallel-twin engine is designed to provide exceptional power and performance, making it well-suited for both daily riding and spirited twisties.

Transmission and Drivetrain

The Kawasaki ZX-4R’s transmission is designed to provide smooth and seamless shifting, making it ideal for both daily commuting and track days. The 6-speed manual transmission features a gear ratio that is carefully selected to optimize engine power delivery and rider feedback.

First Gear: The first gear has a relatively short gear ratio of 3.000:1, allowing the rider to quickly accelerate from a standstill without sacrificing too much low-end grunt.

Second to Sixth Gears: The subsequent gears have increasingly longer ratios, ranging from 2.333:1 to 1.857:1. This allows the rider to maintain momentum and accelerate smoothly through the power band.

The clutch type used in the ZX-4R is a wet multi-disc clutch, designed to provide both durability and smooth engagement. The clutch pack features multiple friction plates with different thicknesses, allowing for precise control over engine braking and throttle response.

The final drive of the ZX-4R is equipped with a 530mm O-ring chain, providing reliable power transmission while minimizing maintenance requirements.

Braking System

The Kawasaki ZX-4R’s advanced braking system is designed to provide exceptional stopping power, allowing riders to confidently navigate a variety of road conditions. Front Calipers: The bike is equipped with 2-piston calipers that grip 260mm petal-style rotors up front, providing ample surface area for heat dissipation and efficient braking performance.

Rear Caliper: The rear brake features a single-piston caliper gripping a 220mm rotor, designed to provide balanced braking power and stability. ABS Module: The ZX-4R’s ABS module is programmed to work seamlessly with the bike’s electronic control unit (ECU), allowing for precise control over braking performance.

The system is designed to detect when the rear wheel is about to lock up and apply gentle pressure to the caliper, preventing wheel lock-up and maintaining traction. This advanced technology enables riders to brake harder and more frequently without sacrificing control or stability. Braking Modes: The ZX-4R’s ABS module features two distinct braking modes: Normal and Low-Rate. In Normal mode, the system provides optimal braking performance for most riding conditions. In Low-Rate mode, the system reduces braking force to prevent wheel lock-up on slippery surfaces, providing increased traction and stability.

  • Key Features:
    • 2-piston front calipers with 260mm petal-style rotors
    • Single-piston rear caliper with 220mm rotor
    • Advanced ABS module with Normal and Low-Rate modes
    • Optimized for high-performance braking performance and traction

Suspension and Handling

The Kawasaki ZX-4R’s suspension system is designed to provide exceptional stability and agility, allowing riders to carve through corners and navigate rough roads with confidence. At the front, the inverted fork features 37 mm tubes that provide a stout 120 mm of travel, giving the bike plenty of room to absorb bumps and jolts. The adjustable preload allows riders to fine-tune the suspension to suit their riding style and load.

The horizontal back-link rear suspension provides an additional 130 mm of travel, making it well-suited for long highway stretches or twisty mountain roads. The gas-charged shock absorber features a compression damping ratio that is carefully calibrated to provide a smooth ride while maintaining excellent handling. The rear suspension also features adjustable preload, allowing riders to customize the bike’s response to changing road conditions.

The combination of these suspension components allows the Kawasaki ZX-4R to maintain its composure and traction in a wide range of situations, making it an exceptional choice for both casual cruisers and aggressive riders alike. Whether carving through canyons or commuting through city streets, the ZX-4R’s suspension system is designed to provide a thrilling and confidence-inspiring ride.

Riding Experience

The Kawasaki ZX-4R’s powerful engine, lightweight chassis, and advanced braking system come together to create an exceptional riding experience. Acceleration is one area where the ZX-4R truly shines. With its powerful 636cc parallel-twin engine producing 110 horsepower at 12,000 rpm, the bike can go from 0-60 mph in just 3.5 seconds. This incredible acceleration is made possible by a carefully tuned transmission and a chassis that is designed to optimize power delivery.

When it comes to braking, the ZX-4R features advanced technology to provide exceptional stopping power. The bike is equipped with dual 310mm petal discs up front, paired with a 220mm disc at the rear. These discs are squeezed by dual piston calipers in the front and a single piston caliper in the back. This setup provides excellent braking performance, with a consistent feeling and predictable bite.

In addition to its impressive acceleration and braking capabilities, the ZX-4R also features cornering that is designed to inspire confidence. The bike’s upright riding position and wide handlebars provide excellent control and visibility, making it easy to carve through corners with precision. The bike’s 17-inch wheels are shod with sticky tires that provide excellent grip, allowing riders to push the limits of what’s possible on twisty roads.

In conclusion, the Kawasaki ZX-4R is a high-performance motorcycle that offers an exceptional combination of power, agility, and handling. With its powerful engine, lightweight chassis, and advanced braking system, this bike is capable of delivering thrilling performance on both the street and track. Whether you’re a seasoned rider or just starting out, the Kawasaki ZX-4R is sure to provide an unforgettable riding experience.