HONDA 14721-MG8-000 Engine Exhaust Valve

( Manufacturer Part Number: 14721-MG8-000 ), ( Type: Exhaust Valve ), ( Machine Type: Street Motorcycle ), ( Features: Oem ), ( Country Of Origin: Japan )

Review HONDA Engine Exhaust Valve Oem fits SHADOW 1100 VT 700 1986–1996

The **Honda 14721-MG8-000 Exhaust Valve** is a precision-engineered component designed exclusively for the iconic **Honda Shadow VT 700 and VT 1100 models** produced between **1986 and 1996**, ensuring optimal performance and longevity for these legendary cruisers. Crafted from high-grade **forged steel**, this valve is meticulously machined to Honda s exacting specifications, guaranteeing a perfect fit within the engine s combustion chamber while maintaining the critical **0.004-inch (0.1016 mm) valve-to-seat contact** required for efficient sealing and combustion. The valve s **stainless steel stem** is heat-treated for durability, resisting wear and thermal expansion to prevent premature failure, even under the demanding conditions of high-performance riding or extended use. Engineered with a **conical seat contact area**, this valve ensures minimal carbon buildup and consistent airflow, which is essential for maintaining peak engine efficiency and power output in the VT series **air-cooled, horizontally opposed twin-cylinder** configuration. Whether replacing a worn valve due to normal wear, addressing a misfire, or upgrading for enhanced reliability, this OEM-quality part is a direct replacement for the original equipment, eliminating the need for modifications or adjustments. Ideal for both restoration projects and routine maintenance, the **Honda 14721-MG8-000 Exhaust Valve** exemplifies the brand s commitment to precision engineering, delivering the same dependable performance that has made the Shadow a timeless classic among motorcycle enthusiasts.

### **Pros and Cons of Buying a 1986 1996 Honda Shadow VT 700/1100 with a 14721-MG8-000 Engine and Exhaust Valve Issues**

#### **Pros**

1. **Proven Reliability** The Honda VT700/1100 is a classic dual-sport motorcycle known for its durability, especially when maintained properly. Many units last well beyond 100,000 miles with basic upkeep.

2. **Strong Engine Platform** The **MG8 (14721-MG8-000)** engine is a robust air-cooled, parallel-twin design with a reputation for longevity if kept in good condition. The VT700 (1986 1991) and VT1100 (1992 1996) share many components, making parts and modifications easier to source.

3. **Off-Road Capability** The VT series was designed for adventure riding, with a sturdy frame, long-travel suspension (for its time), and a rugged build. It performs well on dirt roads and light trails, making it a practical choice for dual-sport enthusiasts.

4. **Fuel Efficiency** Compared to modern sportbikes, the VT700/1100 offers excellent fuel economy, averaging **40 50 mpg** depending on riding style. This makes it cost-effective for long-distance touring or daily commuting.

5. **Modification Potential** The VT platform is highly modifiable. Aftermarket support includes performance upgrades (exhaust, carburetions, camshafts), suspension tuning, and cosmetic enhancements. The **exhaust valve issue** (if isolated to a single valve) can often be addressed with a replacement valve or valve seat, rather than a full engine rebuild.

6. **Resale Value & Community** Honda s reputation ensures that well-maintained VT700/1100s hold value reasonably well. There is also a strong owner community, making it easier to find parts, advice, and restoration help.

7. **Comfortable for Long Rides** The ergonomics of the VT series are well-suited for touring, with a relaxed riding position and adequate storage options (panniers, top case).

8. **Lower Running Costs** Compared to modern bikes, maintenance costs are relatively low. Basic upkeep (oil changes, chain adjustments, tire rotations) keeps it running smoothly without breaking the bank.

---

#### **Cons**

1. **Exhaust Valve Wear (Potential Major Issue)**

- The **14721-MG8-000 engine** (shared by VT700/1100) is prone to **exhaust valve seat recession** and **valve stem wear**, particularly in higher-mileage bikes. This can lead to **burned valves, poor compression, or misfires**.

- If the issue is severe, replacing the **valve seats, valves, or even the cylinder head** may be necessary, which can be **costly ($300 $800 )** depending on labor and parts.

- **Symptoms** include rough idling, loss of power, blue smoke from the exhaust, or a "ticking" noise from the engine.

2. **Age-Related Wear & Tear**

- Many units in this range have **high mileage (50,000 150,000 miles)**, leading to worn **clutches, chains, sprockets, and suspension components**.

- **Timing chain stretch** (common in air-cooled Hondas) can cause **timing issues**, requiring replacement ( $400 $600).

- **Carburetor drift** (especially on CV carbs) can lead to **poor throttle response**, requiring cleaning or rebuilding.

3. **Electrical & Ignition Problems**

- Older VTs often suffer from **weak or failing alternators, voltage regulators, or ignition coils**, leading to **battery drain or no-start conditions**.

- **CDI (Capacitor Discharge Ignition) units** can fail, requiring replacement ( $100 $200).

4. **Suspension & Handling Limitations**

- The **front fork (AER or AER-F) and rear shock** are **stiff by modern standards**, making the bike feel less nimble on pavement.

- **Tire wear** (especially on dual-sport tires) can affect handling, and modern tires may not fit as well due to age-related flex in the rims.

5. **Fuel & Emissions Concerns**

- **Lead-free fuel** can damage older engines (especially if the bike hasn t been run on it recently). Some owners report **ring sticking or valve issues** when switching to modern fuel.

- **No modern emissions compliance** means no catalytic converters or strict emissions testing (if applicable in your region).

6. **Parts Availability & Cost**

- While Honda parts are widely available, **some rare components (e.g., specific gaskets, seals, or aftermarket mods)** can be expensive or hard to find.

- **Labor costs** for classic bikes can be higher than for modern motorcycles due to specialized mechanics.

7. **Maintenance Intensity**

- **Valve clearance checks** (every 5,000 10,000 miles)

- **Carburetor adjustments**

- **Chain & sprocket lubrication**

- **Suspension servicing**

- **Neglect can lead to catastrophic failure** (e.g., seized engine, broken crankshaft).

8. **Comfort & Modern Ergonomics**

- The **seat, handlebars, and footpegs** are **less ergonomic** compared to modern adventure bikes.

- **Wind noise and cold-weather comfort** are not as refined as in newer models.

---

### **Ending Conclusion**

- You **inspect the engine thoroughly** (check for valve wear, compression, and timing).

- You **budget for potential repairs** (valve seats, head gasket, timing chain).

- You **plan to maintain it properly** (regular oil changes, carb tuning, suspension service).

- You **enjoy the classic dual-sport experience** and don t mind some trade-offs in modern comfort.

However, if the **exhaust valve issue is severe** (burned valves, cracked seats, or a failing cylinder head), the repair costs may **outweigh the bike s value**. In such cases, a **lesser-mileage VT or a different model (e.g., Honda Africa Twin, Suzuki DL650, or Kawasaki Versys)** might be a smarter choice.

### **Recommendation**

- **Valve condition** (lift, seat recession, stem wear).

- **Compression & leak-down test** (should be **120 140 psi** per cylinder).

- **Timing chain & sprocket wear**.

- **Carburetor & ignition health**.

- **Blue smoke from exhaust** (indicates oil burning due to valve or ring wear).

- **Visible carbon buildup on spark plugs** (sign of poor combustion).

- **Excessive chain stretch** (should have **no more than 1/2" slack**).

- **Negotiate the price down** (expect to pay **$2,000 $4,000** depending on condition).

- **Budget for repairs** (valve job: **$300 $600**, head gasket: **$200 $400**, timing chain: **$400 $800**).

- **Consider a less expensive alternative** (e.g., a **VT600, CB750, or a used Africa Twin**) if the repair costs are prohibitive.

- **Prioritize the engine** (clean carburetors, replace valves/seats if needed, check for warped head).

- **Upgrade suspension** (aftermarket forks like ** hlins or Marzocchi** can improve handling).

- **Modernize safety** (better tires, ABS, LED lighting if possible).

- **Weekend adventure riding** (if well-maintained).

- **Commuter or touring** (if you don t mind some rough spots).

- **Project bike** (if you enjoy restoration and mechanical work).

A **well-maintained VT700/1100 with minor valve issues can be a fantastic bike** for the right owner someone who **values reliability, simplicity, and the classic Honda experience**. However, if the **exhaust valve problem is significant**, it may not be worth the repair cost unless

Details:

These parts are from a running 1986 Honda Shadow VT 700. If it is determined to not be in the same condition or original packaging, deductions may applied. Items are carefully shipped out with ample amounts of padding.

part #: 14721mg8000 prices

• $39.99-$54.52

specifications valvemotorcycleaz:

• for models: 1100, Vt, 700, Shadow
• for makes: Honda
• for years: 1986-1996
• mpn: 14721-mg8-000
• type: Exhaust Valve
• machine type: Street Motorcycle
• features: Oem
• country of origin: Japan

payments valvemotorcycleaz:

• other
• wallet: Google-pay
• credit card: Discover

seller valvemotorcycleaz:

• city: Astor, Florida
• rating: 100.0%
• # reviews: 367

shipping valvemotorcycleaz:

• transit: 3-9 Days
• service: USPS Ground Advantage
• cost: $0.00
• carrier: USPS
• type: Calculated
• class: Standard

returns valvemotorcycleaz:

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

general valvemotorcycleaz:

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

offer valvemotorcycleaz:

• quantity: 2
• sold: 0
• best offers: True
• availability: In Stock
• options: Ship-to-home
• started: February 10, 2026

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