2025 Kawasaki Ninja ZX-4RR Project Bike Review

Project Bike Upgrades

• 🏍️ The 2025 Kawasaki Ninja ZX-4RR project bike received several key modifications to enhance its performance and aesthetics.
• 🛠️ Upgrades include a Yoshimura AT2 slip-on exhaust, Louis Moto designer seat covers, and Continental Conti Attack SM2 tires.
• 💰 The Yoshimura AT2 slip-on muffler costs $650, the Louis Moto designer seat covers are $300, and the Continental tires are $500 MSRP.

Engine & Transmission Insights

• ⚙️ Powered by a 399cc dual overhead cam water-cooled inline-4 engine with a 16-valve cylinder head, producing around 50 horsepower (more with the exhaust).
• 🔊 The Yoshimura AT2 slip-on exhaust provides a racy sound, is 50-state legal, requires no remapping, and reduces curb weight by 5 lbs.
• 🚀 Features a six-speed transmission, slipper clutch, cable-actuated clutch, and an electronic quick shifter for full-throttle upshifts and downshifts.

Improved Handling & Suspension

• टायर The Continental Conti Attack SM2 tires significantly upgrade from the stock GPR300s, offering better road feel and a sharper profile that enhances handling.
• ⚖️ The bike's original 415 lb curb weight was reduced to 410 lbs with the new exhaust, contributing to its nimble handling.
• 🛣️ The Showa suspension includes a single-function fork with preload adjustment and a rear shock with preload, compression, and rebound, deemed adequate for the bike's power output.

Braking & Rider Aids

• 🛑 Equipped with triple hydraulic disc brakes front and rear, which are more than adequate for slowing down the 410 lb motorcycle.
• ⚠️ The ABS is non-IMU powered and was noted to be disabled during the ride, allowing for nose wheelies.
• 💡 The color TFT instrument panel is functional and easy to read, allowing adjustments to engine power mode settings and includes non-IMU powered traction control.

Overall Riding Experience

• 🤩 The ZX-4RR is described as a "hoot to ride", providing a thrilling experience without needing to go very fast, making it accessible for newer sport bike riders.
• 🏞️ It is well-suited for slower, tighter roads, where its limited power output allows riders to fully utilize its capabilities.
• 🛋️ Despite being a sport bike, it offers a comfortable and cozy ride, handling bumps well, making it a pleasant street bike.