KTM 55737020000 Cylinder Power Valve Exhaust 1728 S87

( Manufacturer Part Number: 55737020000 ), ( Type: Exhaust Valve ), ( Country Of Origin: United States )

Review KTM Cylinder Power Valve Exhaust Assembly S87 fits XCW 300 2021

The **KTM 55737020000 2021 300 XC-W Cylinder Power Valve Exhaust (1728 S87)** is a high-performance, precision-engineered component designed exclusively for KTM s 300 XC-W Enduro motorcycle, ensuring optimal power delivery, enhanced throttle response, and improved exhaust flow. This aftermarket cylinder head assembly features a **customized power valve system**, meticulously calibrated to maximize efficiency across a wide RPM range while maintaining reliability and durability. The **1728 S87 designation** indicates a tuned variant optimized for aggressive riding styles, offering a sharper powerband and quicker spool-up compared to the stock configuration. Crafted from high-grade materials, including a robust cylinder barrel and precision-machined valve mechanisms, this component is built to withstand the demands of off-road and trail riding, delivering consistent performance under extreme conditions. The exhaust porting is finely tuned to reduce backpressure, allowing for smoother airflow and a more aggressive exhaust note ideal for riders seeking a balance between power and responsiveness. Whether used for competition, long-distance enduro, or aggressive trail riding, this cylinder power valve exhaust assembly ensures that the 300 XC-W s engine operates at peak efficiency, providing a noticeable boost in acceleration and overall drivability. Installation requires professional expertise to ensure proper sealing and alignment, but the result is a motorcycle that feels more connected, responsive, and capable, making it a sought-after upgrade for performance-focused riders.

### **Pros and Cons of buying a KTM 300 XC-W (2021, Part Number: 55737020000, Cylinder Power Valve, Exhaust 1728 S87)**

1. **Performance and Power**

The 2021 KTM 300 XC-W is equipped with a high-performance 275.5cc single-cylinder engine paired with a **cylinder power valve (CPV)** system, which enhances throttle response and power delivery. The **S87 exhaust** (1728 model) is tuned for better airflow and efficiency, providing a noticeable boost in mid-range and top-end power compared to stock models. This makes it ideal for trail riding, enduro, and light off-road racing.

2. **Lightweight and Agile**

KTM s reputation for lightweight frames is upheld here. The 300 XC-W weighs around **103 kg (227 lbs)**, making it highly maneuverable on technical terrain. Its compact size and low seat height (880 mm) improve agility, especially for riders of average height.

3. **Advanced Suspension**

The bike features **WP XPLOR suspension**, which includes adjustable preload on both the front fork and rear shock. This allows riders to fine-tune damping for different trail conditions, improving comfort and control. The **WP X39 rear shock** is particularly praised for its smoothness and responsiveness.

4. **Electronic Rider Aids**

- **Trail Control (TC)** Adjustable traction control for slippery conditions.

- **Wheelie Control (WC)** Prevents uncontrolled wheelies.

- **Launch Control (LC)** Assists in smooth starts from a standstill.

- **Engine Brake Control (EBC)** Reduces rear brake drag for better maneuverability.

These features are beginner-friendly but also useful for experienced riders in tricky situations.

5. **Durability and Reliability**

KTM s engines are known for their longevity, especially when maintained properly. The **2021 model** incorporates updates from previous years, including improved cooling and fuel delivery, which contribute to reliability. The **CPV system** also reduces wear on internal components by optimizing power delivery.

6. **Off-Road Capability**

The XC-W is designed for trail riding, with a **long-travel suspension setup (190 mm front, 200 mm rear)** and a **knobby tire package** (typically 80/100-21 front and 120/90-18 rear). The bike s **low gearing** and **aggressive handling** make it well-suited for rocky, root-filled, and steep trails.

7. **Aftermarket Support**

The KTM 300 XC-W has a strong aftermarket following, with availability of **performance upgrades** (e.g., aftermarket exhausts, air filters, suspension tuning) and **customization options**. This makes it easier to tailor the bike to personal preferences.

8. **Fuel Efficiency**

Despite its sporty nature, the 300cc engine remains fuel-efficient for a dual-sport bike, typically averaging **3.5 4.5 L/100 km (60 70 mpg)** in mixed riding conditions. This is better than many larger displacement bikes.

9. **Resale Value**

KTM bikes hold their value reasonably well, especially models with desirable features like the CPV and S87 exhaust. The 2021 XC-W is still a relatively recent model, which may appeal to buyers looking for a pre-owned bike with modern technology.

10. **Beginner-Friendly Yet Capable**

While the XC-W is capable of serious off-road riding, its manageable power (around **30 32 hp**) and electronics make it accessible for new riders. Experienced riders will appreciate its versatility for both trail riding and light enduro.

---

1. **Limited Power for Heavy Riders or Aggressive Use**

The 300cc engine is **not suitable for riders over 90 kg (200 lbs)** without modifications, as the power-to-weight ratio becomes less impressive. Heavier riders may find the bike underpowered on steep climbs or in aggressive riding scenarios. The CPV helps, but it s not a replacement for a larger engine.

2. **Suspension Tuning Can Be Tricky**

While the WP XPLOR suspension is high-quality, it requires **careful adjustment** to match rider weight and trail conditions. Poorly tuned suspension can lead to either a harsh ride or poor handling. Some riders may prefer to invest in aftermarket suspension (e.g., hlins or Showa) for better customization.

3. **Maintenance Costs**

KTM bikes, while durable, have **higher maintenance costs** compared to mass-market brands. Components like suspension, tires, and electronics (e.g., ECU upgrades) can be expensive. Riders must budget for regular servicing, especially if they push the bike hard.

4. **Comfort for Long Distances**

The XC-W is **not ideal for long highway rides** due to its narrow seat, upright riding position, and lack of wind protection. It s primarily an off-road bike, and extended highway use can be uncomfortable.

5. **Noise and Vibration**

The single-cylinder engine, while peppy, can be **loud and vibration-heavy** at higher RPMs. The S87 exhaust reduces some of this, but it remains noticeable compared to modern dual-sport bikes with more refined engines (e.g., Honda CRF300L).

6. **Limited Storage**

The XC-W has **minimal storage space** only a small top box and no under-seat storage. Riders carrying gear for long trips may need to invest in aftermarket panniers.

7. **Price Relative to Alternatives**

Even as a used 2021 model, the XC-W can be **expensive** compared to other 300cc dual-sports or enduro bikes (e.g., Honda CRF300L, Yamaha TW200, or Suzuki DR200S). Buyers should compare prices across brands to ensure they re getting the best value.

8. **Electronics Can Be Overwhelming for Beginners**

While the Pro-Tec electronics are helpful, some riders (especially beginners) may find the **multiple settings and modes** confusing. It takes time to learn how to optimize them for different conditions.

9. **Tire Wear**

The knobby tires designed for off-road use **wear out quickly** on mixed terrain or highway riding. Riders who frequently switch between trails and pavement may need to replace tires more often.

10. **Resale Depreciation**

Like most motorcycles, KTM bikes experience **depreciation over time**. While the 2021 model holds value better than older ones, it may not retain as much as a newer or more premium bike (e.g., a Husqvarna or Yamaha with similar specs).

---

The **KTM 300 XC-W (2021, CPV, S87 exhaust)** is an **excellent choice for riders** who prioritize **performance, agility, and off-road capability** without the complexity of a full enduro bike. It strikes a balance between **fun, efficiency, and versatility**, making it suitable for trail riding, light enduro, and even beginner-friendly adventure touring.

- Need a bike for **long-distance highway riding** or comfort.

- Require **high power output** for heavy riders or aggressive use.

- Prefer **minimal maintenance** or a quieter, smoother ride.

- Are on a **tight budget**, as used prices can still be high.

If you re a **trail rider, enduro enthusiast, or someone looking for a capable 300cc dual-sport with modern electronics**, the XC-W is a **strong recommendation**. Just ensure you re prepared for **regular maintenance, suspension tuning, and the bike s limitations on pavement**.

- **Buy if:** You want a **lightweight, peppy, and capable off-road bike** with modern electronics, and you re willing to invest in maintenance and accessories for comfort.

- **Avoid if:** You need a **versatile adventure bike** for long trips, prefer a **quieter/smoother ride**, or are on a budget where a slightly older or different model (e.g., Honda CRF300L) would be more practical.

- **Consider alternatives:** If you want **more power**, look at the **350 XC-W or 450 XC-F**. If you prefer **longer travel suspension**, the **Husqvarna TE 300i** or **Yamaha T n r 700** (for adventure) might be better.

- **Test ride first:** Always test the bike to ensure the **suspension, ergonomics, and power delivery** suit your riding style.

For most **serious trail riders or enduro enthusiasts**,

Details:

Removed from a 2021 KTM 300 XCW. Working replacement or spare. Threads are in good condition. Includes hardware as pictured.

Imperfections, pitting and weathering as pictured. Worked well before removal. Smaller items combined with larger will show a significant price decrease in shipping.

part #: 55737020000 price

• $2362.54

specifications valvemotorcycleaz:

• for models: Xcw, 300
• for makes: Ktm
• for years: 2021
• mpn: 55737020000
• type: Exhaust Valve
• country of origin: United States

seller valvemotorcycleaz:

• # reviews: 4665
• city: Homosassa, Florida
• rating: 100.0%

offer valvemotorcycleaz:

• best offers: True
• started: April 20, 2026
• quantity: 1
• options: Ship-to-home
• sold: 0
• availability: In Stock

general valvemotorcycleaz:

• condition: Used
• Engines Engine Parts > Valvetrain Components > Engine Valves

shipping valvemotorcycleaz:

• service: Standard
• transit: 3-8 Days
• cost: $29.99
• class: Standard
• type: Fixed

returns valvemotorcycleaz:

• policy: No Returns

payments valvemotorcycleaz:

• credit card: Visa
• wallet: Apple-pay
• other

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