HONDA 14721-ME5-000 Exhaust Valve

( Manufacturer Part Number: 14721-ME5-000 ), ( Part Type: Valve Exhaust ), ( Compatible Year: 1985, 1984, 1983 ), ( Country Of Origin: Japan )

Review HONDA Exhaust Valve fits NIGHTHAWK 650 1983–1985

The **Honda 14721-ME5-000 Exhaust Valve** is a meticulously engineered component designed exclusively for the **1983 1985 Honda Nighthawk 650** motorcycle, a model renowned for its sporty handling, lightweight frame, and iconic V-twin engine. This valve represents a critical part of the cylinder head assembly, playing a pivotal role in the motorcycle s performance, efficiency, and longevity. Crafted from high-grade **forged steel**, the valve is precision-machined to exacting tolerances to ensure optimal sealing, durability, and heat resistance, which are essential for maintaining peak combustion efficiency in the Nighthawk s high-revving, high-performance engine. The valve s design incorporates a **tapered seat** and a **hardened stem**, allowing it to withstand the intense thermal and mechanical stresses of repeated high-speed operation while minimizing wear and preventing premature failure. Whether you're restoring a classic Nighthawk to its original glory or upgrading an existing engine for improved reliability and power, this OEM-quality valve ensures a seamless fit and consistent performance. Its compatibility with the **ME5 engine** Honda s legendary 650cc V-twin makes it a must-have replacement for riders seeking to preserve the integrity of their motorcycle s powerplant, whether for daily riding, track use, or showroom display. With its robust construction and direct Honda engineering, this valve exemplifies the brand s commitment to precision and performance, delivering a part that not only restores functionality but also enhances the driving experience of one of the most beloved sportbikes of the early 1980s.

### **Pros and Cons of Buying a 1983-1985 Honda Nighthawk 650 with a ME5 Engine and Exhaust Valve Issues**

#### **Pros**

1. **Reliability and Durability** Honda s ME5 engine is known for its robust construction and longevity, especially when maintained properly. Many Nighthawks from this era are still running strong after decades, particularly if the owner has kept up with basic upkeep.

2. **Classic Design and Appeal** The Nighthawk 650 is a cult favorite among classic motorcycle enthusiasts. Its retro styling, lightweight frame, and smooth riding position make it highly desirable for collectors and riders who appreciate vintage bikes.

3. **Good Fuel Efficiency** For its time, the 650cc air-cooled engine was reasonably efficient, making it a practical choice for commuting or long rides without excessive fuel costs.

4. **Modification Potential** The ME5 engine is relatively straightforward to work on, and parts are still available. Many riders enjoy restoring or upgrading these bikes with modern components, such as performance exhausts, carburetures, or suspension upgrades.

5. **Lower Operating Costs (Compared to Modern Bikes)** Fuel, insurance, and maintenance costs are generally lower than those of modern sportbikes, making it an attractive option for budget-conscious riders.

6. **Strong Secondary Market** Due to its popularity, finding parts, restoration guides, and community support is relatively easy. Clubs and forums (such as Honda ME5 forums) provide valuable resources for owners.

7. **Lightweight and Maneuverable** The Nighthawk s small frame and 650cc engine make it easy to handle in tight spaces, appealing to riders who prefer agility over raw power.

---

#### **Cons**

1. **Exhaust Valve Issues (Common Problem)** The ME5 engine is notorious for exhaust valve problems, particularly **valve seat recession** and **valve stem cracks**, which can lead to catastrophic engine failure if ignored. This is a major concern, especially in older bikes that haven t been properly maintained.

- **Symptoms** include blue smoke from the exhaust, loss of power, rough idling, or a hissing sound from the engine.

- **Solution** requires valve job (replacing seats, valves, and possibly the head) or a full engine rebuild, which can be costly ($800 $2,000 depending on labor and parts).

2. **Age and Wear** At 40 years old, many components (brakes, suspension, belts, wiring, and frame) may be worn out and in need of replacement. A thorough inspection is essential.

3. **Poor Modern Safety Standards** The Nighthawk lacks modern safety features such as **ABS, traction control, or advanced braking systems**. Its brakes (especially the rear) are weak compared to today s standards, making it less safe in high-speed or emergency stops.

4. **Rust and Corrosion** Many bikes from this era suffer from rust, particularly in the frame, swingarm, and exhaust. A thorough inspection under the bike is crucial to avoid hidden structural issues.

5. **Limited Power Output** The ME5 engine produces only about **45 50 hp**, which is adequate for cruising but feels underpowered compared to modern sportbikes. Acceleration and top speed are modest.

6. **Maintenance Intensity** Unlike modern bikes with sealed components, the ME5 requires regular **oil changes, chain adjustments, carburetor tuning, and valve maintenance** to stay reliable. Neglect leads to costly repairs.

7. **Parts Availability (But Not Always Reliable)** While parts exist, some components (especially OEM) may be hard to find. Aftermarket parts can be inconsistent in quality, and shipping delays are common.

8. **Resale Value Depends on Condition** A well-restored Nighthawk can hold value, but a neglected one may depreciate quickly. Buyers should be prepared for the bike to lose value unless it s in pristine condition.

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### **Ending Conclusion**

The **1983-1985 Honda Nighthawk 650 with an ME5 engine** is a fantastic choice for **enthusiasts who prioritize vintage charm, modding potential, and a manageable riding experience** provided the buyer is willing to invest time and money in maintenance. Its **reliability, lightweight handling, and classic appeal** make it a rewarding project bike for those who enjoy restoring and riding a piece of motorcycle history.

However, **the exhaust valve issue is a major red flag**. If the bike has **visible signs of valve problems (blue smoke, rough running, or a history of valve failures)**, the repair cost could outweigh the bike s value. A **pre-purchase inspection (PPI) by a trusted ME5 specialist** is **absolutely necessary** before buying.

For **casual riders or those seeking a modern, safe, and low-maintenance bike**, the Nighthawk may not be the best choice. But for **purists, collectors, or those who enjoy mechanical challenges**, it remains a fantastic option **if the engine and frame are in good shape**.

---

### **Recommendation**

- **Get a full mechanical inspection**, especially focusing on the **exhaust valves, cylinder head, and frame for rust**.

- **Budget for a valve job or rebuild** this is the most critical repair.

- **Consider a bike with a known service history** (preferably with recent valve maintenance).

- **Test ride carefully** listen for unusual noises, check for smooth acceleration, and ensure brakes work properly.

- **Avoid bikes with obvious valve issues** this is a dealbreaker.

- **Prioritize bikes with recent maintenance** (oil changes, chain adjustments, carb tune-ups).

- **Be prepared for higher maintenance costs** than a modern bike.

- If the Nighthawk s valve problems are a concern, consider a **Honda CB750 (more reliable, better power)** or a **Yamaha XS650 (similar era, slightly more modern)**.

- For a modern classic feel, a **restored CB400 or CB500** offers better reliability with a similar riding experience.

The **Nighthawk 650 is a great bike for the right buyer** someone who appreciates its heritage, is willing to work on it, and can afford potential repairs. **But it s not a "set-and-forget" machine.** If you re willing to put in the effort, it can be an incredibly rewarding ride. If not, there are better options for hassle-free enjoyment.

Details:

Good used part.

part #: 14721me5000 prices

• $9.99-$24.99

specifications cyclevintagee:

• for models: 650, Nighthawk
• for makes: Honda
• for years: 1983-1985
• mpn: 14721-me5-000
• part type: Valve Exhaust
• compatible year: 1985, 1984, 1983
• country of origin: Japan

offer cyclevintagee:

• started: April 4, 2026
• quantity: 1
• sold: 0
• options: Ship-to-home
• availability: In Stock

shipping cyclevintagee:

• carrier: USPS
• transit: 5-11 Days
• cost: $0.00
• type: Fixed
• class: Standard
• service: USPS Ground Advantage

seller cyclevintagee:

• city: Portland, Oregon
• rating: 100.0%
• # reviews: 958

payments cyclevintagee:

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

general cyclevintagee:

• condition: Used
• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories

returns cyclevintagee:

• policy: No Returns

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