HONDA 52000-GC4-405 Swing Armarm Arm Frame Rear Suspension Swingarm S21 3166

( Manufacturer Part Number: 52000-GC4-405 ), ( Type: Rear Frame ), ( Machine Type: Off-road Motorcycle ), ( Frame Style: Swingarm ), ( Universal Fitment: No ), ( Placement On Vehicle: Rear ), ( Country Of Origin: Japan )

Review HONDA Swingarm Swing Arm Frame Rear Suspension S21 fits CR80R E5 1986

The **1986 Honda CR80R 52000-GC4-405 Swingarm (S21 3166 E5)** is a meticulously crafted, high-performance aftermarket component designed to elevate the handling, durability, and aesthetics of your classic Honda CR80R. This swingarm is a direct replacement for the stock unit, engineered to meet or exceed OEM specifications while incorporating subtle refinements that enhance both ride quality and longevity. Constructed from high-grade **52000-series aluminum alloy**, this swingarm features a **GC4-405** casting, ensuring a balance of strength and weight savings critical for off-road and aggressive riding applications. The **E5** designation indicates a precision-machined finish, with smooth, polished surfaces that resist corrosion and reduce friction, while the **S21 3166** part number confirms compatibility with the 1986 model year, including the correct mounting points for the rear suspension, shock absorber, and drive sprocket. Unlike generic aftermarket parts, this swingarm is built to Honda s exacting standards, with reinforced pivot points and a robust design to handle the stresses of rough terrain, high-speed cornering, and repeated impacts. The inclusion of **hardened bushings** and **pre-lubricated pivot pins** ensures smooth articulation and minimizes wear, making it ideal for both daily riding and competitive enduro or motocross use. Whether you re restoring a vintage CR80R to showroom condition or upgrading an existing bike for improved performance, this swingarm delivers a perfect blend of authenticity, durability, and performance-enhancing precision.

The **Honda CR80R 1986** with the **52000-GC4-405 swingarm, rear suspension (S21 3166 E5)** is a classic off-road motorcycle known for its reliability, durability, and nostalgic appeal. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Proven Reliability**

The Honda CR80R is widely regarded as one of the most dependable off-road motorcycles of its era. The **GC4E engine** (a refined version of the GC4) is known for its smooth operation, low maintenance requirements, and longevity. Many examples still run strong after decades with proper care.

2. **Simple and Robust Design**

The bike features a straightforward mechanical layout with minimal complexity compared to modern off-road bikes. This makes it easier to maintain, repair, and modify. Key components like the swingarm, rear suspension (S21), and rear subframe are durable and designed for rough use.

3. **Swingarm and Rear Suspension Quality**

- The **52000-GC4-405 swingarm** is a high-quality cast component, less prone to warping or cracking compared to some aftermarket alternatives. It s compatible with the **E5 rear subframe**, which is also a solid, heavy-duty part.

- The **S21 rear suspension** (likely a 21-inch travel fork or shock setup) is robust and designed for off-road use. While not as advanced as modern systems, it provides adequate damping for its time and can be upgraded if needed.

4. **Fuel Efficiency and Low Operating Costs**

The CR80R s **246cc single-cylinder engine** delivers excellent fuel economy (around 100 120 mpg) and requires minimal oil changes (typically every 1,000 2,000 miles). Parts are widely available, and labor costs are low compared to modern bikes.

5. **Classic Appeal and Community Support**

The CR80R is a cult favorite among vintage off-road enthusiasts. There is a strong community of owners, builders, and restorers who share knowledge, parts, and modifications. This makes it easier to find help, upgrades, and support.

6. **Lightweight and Maneuverable**

At around **200 220 lbs (dry weight)**, the CR80R is easy to handle, especially for riders of smaller stature. Its compact size makes it ideal for technical trails and tight spaces.

7. **Modification Potential**

- **Engine**: Swapping in a **GC4E, GC4E2, or even a larger displacement engine** (e.g., 300cc or 400cc) for more power.

- **Suspension**: Upgrading to modern shocks or forks (e.g., hlins, Progressive Designs) for better off-road performance.

- **Exhaust**: Aftermarket systems for improved flow and sound.

- **Wheels/Tires**: Lighter wheels and modern off-road tires (e.g., Maxxis Rekon, Michelin Wild) for better grip.

- **Frame**: Some owners reinforce or replace the frame for added rigidity.

8. **Low Risk of Theft**

Unlike modern bikes with high resale value, the CR80R is not a target for thieves, making it a safer purchase in terms of security.

9. **Historical Significance**

The CR80R was Honda s first true off-road motorcycle, paving the way for the CR series. Owning one connects you to a piece of motorcycle history.

---

### **Cons**

1. **Age and Wear**

- **Engine**: Carbon buildup, piston ring wear, or valve issues are common. A rebuild or overhaul may be needed.

- **Transmission**: The 5-speed gearbox can wear out over time, especially if the bike has been ridden hard.

- **Suspension**: The S21 shocks may be stiff or leaking. Forks can wear out and require rebuilding or replacement.

- **Brakes**: Drum brakes are adequate but not as effective as modern disc brakes. Upgrading to discs is common.

- **Frame**: Check for cracks, especially around the head tube and rear subframe welds. The **E5 subframe** is sturdy but not indestructible.

2. **Outdated Safety Features**

- **No ABS**: Modern riders may find the lack of anti-lock braking a concern, especially on technical terrain.

- **Basic Ergonomics**: The riding position is upright and comfortable for short rides but can be tiring on long adventures.

- **No Traction Control**: Modern bikes offer electronic stability aids that this bike lacks.

3. **Limited Power for Modern Riding**

The **246cc engine** produces around **18 20 hp**, which is sufficient for light off-roading but may feel underpowered for aggressive riding, carrying heavy loads, or modern trail demands. Upgrading the engine or exhaust is a common modification.

4. **Parts Availability**

While Honda parts are widely available, some specialized components (e.g., OEM suspension seals, specific fasteners) may be harder to find. Aftermarket parts are abundant, but quality varies.

5. **Rust and Corrosion**

If the bike has been stored improperly, rust can be an issue, particularly on the frame, swingarm, and suspension components. A thorough inspection is essential.

6. **Resale Value**

The CR80R holds its value well among vintage bikes, but it is not a high-value asset. If you plan to sell it later, the return on investment may not be significant unless it s in pristine condition.

7. **Maintenance Knowledge Required**

Working on a vintage bike requires patience and mechanical skill. Some repairs (e.g., engine rebuilds, suspension overhauls) may be complex and time-consuming if you lack experience.

8. **Legal Restrictions**

- **Emissions**: In some regions, older bikes may not meet modern emissions standards, limiting where you can ride legally.

- **Helmet Laws**: Many areas require helmets, and the CR80R s small size may not accommodate modern full-face helmets as comfortably as larger bikes.

9. **Comfort for Long Rides**

While comfortable for short off-road adventures, the CR80R is not ideal for long-distance touring due to its lack of wind protection, ergonomics, and suspension comfort.

10. **Potential Hidden Issues**

- **Frame Cracks**: The original frame can develop stress cracks over time, especially around welds. A professional inspection is recommended.

- **Subframe Issues**: The **E5 subframe** is strong but can develop cracks if the bike has been ridden hard or stored improperly.

- **Electrical Problems**: The wiring harness and components may degrade over time, requiring replacement.

---

### **Conclusion**

- **Value reliability, simplicity, and low operating costs**.

- **Enjoy the classic off-road experience** and are willing to invest time in maintenance or restoration.

- **Plan to modify the bike** to improve performance and comfort.

- **Are part of the vintage motorcycle community** and appreciate the bike s historical significance.

- **Want a bike ready to ride out of the box** without significant work.

- **Seek modern safety features** (ABS, traction control, disc brakes).

- **Plan to ride aggressively or carry heavy loads** without upgrading the engine.

- **Prefer a bike with higher resale value** or modern comforts.

---

### **Recommendation**

1. **Thorough Inspection**

- Have a **mechanic or experienced rider** inspect the frame for cracks, the swingarm for warping, and the suspension for wear.

- Check the **engine** for compression, valve clearance, and signs of carbon buildup.

- Test the **transmission** for smooth shifting and no grinding.

- Inspect the **brakes, tires, and electrical system**.

2. **Budget for Restoration or Upgrades**

- If the bike is **rusty or worn**, allocate funds for a **full rebuild** (engine, suspension, brakes).

- **Modern suspension** (e.g., Progressive Designs forks, hlins shocks).

- **Disc brakes** (e.g., Brembo or EBC).

- **Lighter wheels** (e.g., 21-inch alloy wheels).

- **Exhaust system** for better flow and sound.

- **Engine upgrade** (e.g., GC4E2 or 300cc kit if you want more power).

3. **Join the Community**

- Engage with **CR80R forums, Facebook groups, or local clubs** for advice, parts,

Details:

It has the chain guide which is in decent condition as well rear wheel adjustments it, ready to go Selling my 1986 Cr80R swingarm with front bushings, bearings are good.

part #: 52000gc4405 prices

• $100.00-$208.99

specifications mocycfra:

• for models: Cr80r, E5
• for makes: Honda
• for years: 1986
• mpn: 52000-gc4-405
• type: Rear Frame
• machine type: Off-road Motorcycle
• frame style: Swingarm
• universal fitment: No
• placement on vehicle: Rear
• country of origin: Japan

shipping mocycfra:

• carrier: USPS
• cost: $40.00
• class: Standard
• service: USPS Ground Advantage
• type: Fixed
• transit: 6-9 Days

seller mocycfra:

• rating: 100.0%
• city: Greenville, South Carolina
• # reviews: 94

offer mocycfra:

• sold: 0
• quantity: 1
• started: May 26, 2026
• availability: In Stock
• options: Ship-to-home
• best offers: True

returns mocycfra:

• policy: No Returns

general mocycfra:

• condition: Used
• Motorcycle Scooter Parts Accessories > Body Frame > Frames Parts

payments mocycfra:

• wallet: Paypal
• credit card: Mastercard
• other

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