Yoshimura - RS-4 Full System (Yamaha)

Yoshimura - RS-4 Full System (Yamaha)Yoshimura RS 4 Signature Series Full System (Yamaha) Developed through years of pro level racing, the Yoshimura RS 4 Signature Series Full System was built to make Yamaha motocross bikes faster, lighter, and smoother from the gate drop to the checkered flag. Engineered for riders who demand top tier performance, the RS 4 delivers real power gains across the entire rpm range, with a stronger pull out of corners and a crisp, race tuned sound that stands

Yoshimura – RS-4 Signature Series Full System (Yamaha)

Developed through years of pro-level racing, the Yoshimura RS-4 Signature Series Full System was built to make Yamaha motocross bikes faster, lighter, and smoother from the gate drop to the checkered flag. Engineered for riders who demand top-tier performance, the RS-4 delivers real power gains across the entire rpm range, with a stronger pull out of corners and a crisp, race-tuned sound that stands out without being too loud.

The RS-4’s pentagonal-shaped muffler is more than just a visual statement — it increases internal volume for improved exhaust flow and tone control. Inside, the Polyresonant Duplex Chamber and two-stage stepped baffle reduce noise while maintaining power, giving your bike that clean factory bark. Each system comes with a stainless steel or titanium header for durability and flow, while the carbon fiber end cap adds a finishing touch worthy of any pro-level setup.

Why We Like It:
It’s the perfect mix of power, precision, and sound. The RS-4 gives Yamaha’s four-strokes that deep, controlled Yoshimura tone and a noticeable boost in torque and top-end pull. It feels like a full factory system — because it is.

Why It’ll Work for You:
This system makes your Yamaha smoother off the bottom, stronger through the mid, and more responsive on top. You’ll get better throttle control, faster acceleration, and less weight — all while keeping noise levels in check. Whether you’re racing or riding hard on the weekends, the RS-4 brings pro-level confidence and reliability.

Variants / Options:
Available in three configurations:

• Stainless Header with Aluminum Canister and Carbon End Cap
  
  

• Titanium Header with Titanium Canister and Carbon End Cap
  
  

• Titanium Header with Carbon Canister and Carbon End Cap
  
  

Key Features:

• Developed through years of professional racing
  
  

• Pentagonal muffler design for better flow and unique factory styling
  
  

• Polyresonant Duplex Chamber reduces sound while improving performance
  
  

• Two-stage stepped baffle for smooth power and tone control
  
  

• Carbon fiber end cap for weight savings and durability
  
  

• Improved torque and power across the rpm range
  
  

• Lighter than stock for better handling and acceleration
  
  

• Available in stainless or titanium configurations
  
  

• Handcrafted by Yoshimura in the USA