MOTO TASSINARI WPS59-6674 Delta Reed Valve V3140-794-2

( Brand: Moto Tassinari ), ( Manufacturer Part Number: WPS59-6674 ), ( Part Type: Valve ), ( Universal: No )

Review MOTO TASSINARI 59-6674 Delta Reed Valve Yam Except fits TWINS 800

The **Moto Tassinari WPS59-6674 (59-6674 V3140-794-2 Delta Reed Valve)** is a meticulously engineered, high-performance replacement reed valve designed specifically for Yamaha YZF-R1, YZF-R6, and other high-revving twin-cylinder sportbikes, including the iconic YZF800 twins. Crafted from premium materials, this valve is built to withstand the extreme demands of modern high-performance engines, ensuring optimal airflow and reliability under intense racing or high-speed conditions. The **Delta reed design** is a hallmark of Moto Tassinari s expertise, offering a balanced and efficient flow profile that minimizes turbulence while maximizing power output. This valve features a **precision-machined reed plate** with a durable, heat-resistant coating to prevent warping or deformation, even during prolonged high-RPM sessions. The **V3140-794-2** designation indicates a carefully calibrated spring rate and reed geometry tailored to enhance throttle response and torque delivery, particularly in the mid-to-high RPM range where twin-cylinder engines excel. The valve s robust construction, featuring a reinforced housing and sealed gasket system, ensures a secure and leak-proof installation, reducing the risk of vacuum loss or air leaks that could compromise performance. Whether used in street tuning, track days, or full-race applications, this Moto Tassinari reed valve delivers a noticeable improvement in engine breathing, smoothness, and overall responsiveness, making it a trusted choice among riders seeking to extract every ounce of power from their YZF twins. Its compatibility with aftermarket intake systems and its ability to pair seamlessly with other Moto Tassinari components such as intake manifolds or throttle bodies further solidifies its reputation as a premium upgrade for enthusiasts pushing the limits of their bikes.

The Moto Tassinari WPS59-6674 (specifically the Delta Reed Valve version for Yamaha YTZ800/YBR800 twins) is a popular aftermarket exhaust system designed to enhance performance, sound, and aesthetics. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Performance Gains**

- Slightly increased horsepower and torque, particularly noticeable in mid-range RPMs.

- Better throttle response and smoother power delivery, especially in twin-cylinder engines like the YTZ800/YBR800.

- Improved exhaust scavenging, which can enhance combustion efficiency.

2. **Sound Characteristics**

The Delta Reed Valve design is known for producing a deep, aggressive, and slightly "growling" tone that is highly sought after by enthusiasts. The sound is often described as:

- Louder and more pronounced than stock systems, with a noticeable difference in exhaust note.

- A "two-tone" effect where the reed valve creates a distinct pitch shift, adding to the exhaust s personality.

- Better at masking engine noise, making the bike feel more connected to the rider.

3. **Durability and Build Quality**

- High-quality materials, including stainless steel construction that resists corrosion and heat.

- Precision manufacturing, ensuring a tight fit and minimal leaks.

- Robust mounting brackets and clamps that reduce the risk of detachment during riding.

4. **Aesthetic Appeal**

The WPS59-6674 features a sleek, aggressive design that enhances the bike s sporty or aggressive look. The Delta Reed Valve adds a unique visual element, distinguishing it from standard exhausts.

5. **Compatibility**

The system is specifically designed for the Yamaha YTZ800/YBR800 twins, ensuring a seamless fit without modifications to the frame or mounting points. It works well with both stock and upgraded engines.

6. **Warranty and Support**

Moto Tassinari offers a warranty (typically 1 2 years) and has a reputation for good customer service, including technical support and parts availability.

7. **Aftermarket Community Favor**

The WPS59-6674 is a popular choice among Yamaha twin enthusiasts, with many riders reporting positive experiences. This widespread adoption also means easier access to replacement parts or modifications if needed.

---

### **Cons**

1. **Cost**

The WPS59-6674 is not a budget-friendly upgrade. Prices typically range from **$800 to $1,200**, depending on the retailer and any additional accessories (e.g., muffler covers, clamps). This is a significant investment for an exhaust system, especially when compared to stock or more affordable aftermarket options.

2. **Noise Levels**

While the sound is a pro for many, the WPS59-6674 is **extremely loud**, often exceeding legal limits in many regions without additional modifications. Riders may need:

- A **catback system** (if legal restrictions apply).

- **Muffler covers** to reduce noise for street use.

- **Helmet and ear protection** to mitigate noise fatigue during long rides.

Some jurisdictions may require a **DOT-compliant muffler** or restrict the use of reed valves on public roads.

3. **Maintenance and Sensitivity**

- Get gummed up with carbon deposits, reducing performance and altering the sound.

- Require occasional cleaning or replacement, adding to long-term maintenance costs.

Riders who don t maintain their exhaust system properly may experience a loss of power and a muffled tone.

4. **Weight**

While not excessively heavy, the WPS59-6674 is heavier than stock exhausts. This can slightly affect handling, particularly in high-speed maneuvers or aggressive riding.

5. **Potential for Power Loss in Some Cases**

- A slight drop in low-end torque if the engine is not properly tuned.

- The need for a **ECU flash or tune** (e.g., from a company like **Yamaha Performance Tuning or a third-party tuner**) to fully realize performance gains. Without a tune, the bike may still run stock, negating some benefits.

6. **Installation Complexity**

- Basic mechanical skills or access to a mechanic.

- Proper alignment of the exhaust headers to avoid leaks.

- Possible adjustments to the heat shields or mounting brackets for a perfect fit.

7. **Limited Customization**

The WPS59-6674 is a complete system, and while it looks great, it offers fewer customization options compared to modular exhausts. Riders who want to tweak the sound or performance further may need to pair it with additional parts (e.g., different mufflers, headers).

---

### **Conclusion**

The Moto Tassinari WPS59-6674 Delta Reed Valve exhaust is one of the best aftermarket options for Yamaha YTZ800/YBR800 twins, offering significant performance gains, a distinctive sound, and premium build quality. It is ideal for riders who prioritize:

- **Aggressive sound and exhaust note** (even if it means dealing with noise regulations).

- **Noticeable power improvements** (with or without a tune).

- **Durability and a high-end aesthetic** that enhances the bike s appearance.

- Are on a tight budget.

- Prefer a quieter exhaust for daily commuting or legal compliance.

- Don t want to invest time in tuning or maintenance.

If you re willing to address the noise and maintenance aspects, the WPS59-6674 is an excellent choice for those who want a **high-performance, visually striking exhaust** that stands out from stock systems.

---

### **Recommendation**

- You own a Yamaha YTZ800/YBR800 and want a **premium exhaust system** that improves performance and sound.

- You re prepared to **invest in a tune** (e.g., from YPT or a trusted tuner) to maximize gains.

- You don t mind **loud exhaust noise** and are willing to use muffler covers or ride in legal areas.

- You appreciate **high-quality, durable parts** and are okay with the upfront cost.

- You want a **quieter exhaust** (e.g., a **catback system** like the **Moto Tassinari WPS59-6674 with a DOT muffler** or a **non-reed system** like the **Akrapovic or Incon**).

- You re on a **tighter budget** (look for **used systems** or **entry-level aftermarket exhausts** like the **Yamaha Performance Parts catback**).

- You re unsure about **maintenance requirements** (a **stock or mild aftermarket exhaust** may be simpler).

For most serious Yamaha twin enthusiasts, the WPS59-6674 is a **top-tier choice** just be prepared for the noise and investment it demands. If you re new to aftermarket exhausts, test-ride a bike with this system to ensure the sound suits your preferences before committing.

Details:

Higher efficiency improved economy. Features: Patent pending snap together cage design with symmetric reed petals. These items are designed exclusively for closed course competition use ONLY. Moto Tassinari 59-6674 V3140-794-2 W/C DELTA 3 REED VALVE YAM TWINS EXCEPT 800.

This fitment information is based upon the stock version of Motorcycle or unit referenced and any accessory added other modification could invalidate quick reference provided. Dramatic horsepower increase. Longer reed petal life. 1987 1990YamahaWJ 500 Waveform, 1987 - 1993 Yamaha Wave Runner, 1993 - 1996 Yamaha 700 Wave Blaster, 1993 - 1994 Wave Runner Pro VXR, 1994 - 1995 1994 2017YamahaSJ Super Jet, 1994 - 1995 Yamaha III GP, 1994 - 1997 7 1995 - 1996, 1998 Wave Venture, 1996 - 1997 Yamaha 760 Wave Blaster II, 1996 760, 1997 2000YamahaGP 1997 Yamaha III, 1997 1998 - 1999 Yamaha XL 1999 -2004YamahaXL.

Patent pending reed tip shape accelerates the air mixture over tips.

part #: wps596674 prices

• $243.41-$258.95

specifications jetskiintakeez:

• for models: 800, Twins
• for makes: Yamaha
• brand: Moto Tassinari
• mpn: Wps59-6674
• part type: Valve
• universal: No

shipping jetskiintakeez:

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• transit: 3-5 Days
• cost: $0.00
• carrier: FedEx, USPS, UPS
• service: FedEx Ground / FedEx Home Delivery, USPS First Class, USPS Priority Mail, UPS Ground
• type: Fixed

returns jetskiintakeez:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

general jetskiintakeez:

• condition: New
• Parts Accessories > Personal Watercraft Parts > Intake Fuel Systems

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seller jetskiintakeez:

• rating: 100.0%
• city: Omaha, NE
• # reviews: 4261

offer jetskiintakeez:

• quantity: 5
• started: April 13, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock

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