Yoshimura HEPTA FORCE TSS Racing Titanium Cyclone – ZX-25R / ZX-4R

Race-bred. Precision-tuned.
The Yoshimura HEPTA FORCE TSS Racing Cyclone is a full titanium system designed to extract maximum performance—delivering sharp acceleration, reduced weight, and a sound that defines intent.

Product Overview

Engineered for closed-circuit performance, this system features a 4-2-1 exhaust layout, optimising high-RPM power while maintaining strong mid-range usability. The result is a responsive, controllable powerband suited for serious track riding.

The signature 7-sided HEPTA FORCE silencer, finished with a carbon fibre end cap, delivers both performance and a distinctive Yoshimura aesthetic.

Specifications

• Material: Full Titanium
• Layout: 4-2-1 Full Exhaust System
• Silencer: HEPTA FORCE TSS (carbon end cap)

Performance Data (Reference)

Without Sound Diffuser

• ZX-4R (2023): 112 dB / 8000 rpm
• ZX-25R (2023): 111 dB / 8000 rpm
• ZX-25R (2021–2022): 109 dB / 7750 rpm

With Sound Diffuser

• All models: Approx. 104 dB

Track Regulation Reference

• Suzuka / Motegi: ~105 dB limit compatibility with diffuser

Weight

• Standard:
  • ZX-4R: 10.1 kg
  • ZX-25R: 8.6–9.1 kg
• Yoshimura System: ~3.9 kg
  (Approx. 60% weight reduction)

Fitment

• Kawasaki Ninja ZX-25R (2021–2025)
• Kawasaki Ninja ZX-4R / ZX-4R SE / ZX-4R RR (2023–2025)

Key Features

• Full titanium construction for major weight reduction
• 4-2-1 layout for high-RPM performance and mid-range usability
• Removable sound diffuser for adjustable volume
• Compact, tapered 7-sided silencer design
• Maintains oil and filter access with system installed
• Compatible with stock centre stand

Performance Benefits

• Faster throttle response and acceleration
• Significant weight savings for improved handling
• Track-tuned exhaust note with adjustable volume
• Balanced power delivery across the rev range

Service & Support

• Replaceable silencer covers
• Repackable glass wool
• Serviceable carbon end components

Important Notes

• Racing use only – not road legal
• Regular inspection and maintenance recommended
• Specifications may change without notice
• Images may include other products or configurations
• Instructions, if included, may be in Japanese

Bushido Motorcycles

On the edge of control,
precision decides everything.