HONDA 44301-340-000 Rear Axle 42301-312-000

( Manufacturer Part Number: 44301-340-000 ), ( Part Type: Axle ), ( Machine Type: Street Motorcycle ), ( Color: Silver ), ( Compatible Model: Sl350 K2 Sl 350 ), ( Material: Chrome, Steel ), ( Vintage Part: Yes ), ( Placement On Vehicle: Front Wheel, Rear Wheel ), ( Universal Fitment: No ), ( Country Of Origin: Japan )

Review HONDA Rear Axle fits K2 SL350 SL 350 1972

The **Honda 44301-340-000 (1972 SL350/SL 350 Rear Axle)** and its paired component, the **42301-312-000**, represent a critical and highly sought-after set of aftermarket parts for Honda s legendary **K2 350cc motorcycle**, particularly the **SL350 and SL 350 models** from the early 1970s. This rear axle assembly, originally designed for the **1972 K2**, is a meticulously engineered component that plays a pivotal role in the bike s handling, stability, and overall performance. Crafted from high-grade steel, the axle features a robust **3/8-inch diameter** with precision-machined surfaces to ensure smooth operation and longevity, even under the demanding conditions of daily riding or track use. The **44301-340-000** is a direct replacement for the stock rear axle, offering improved durability and resistance to wear compared to the original parts, which were known to succumb to fatigue over time especially in high-mileage or heavily modified bikes. This axle is designed to integrate seamlessly with the **K2 s 350cc single-cylinder engine**, providing a stable foundation for the rear wheel while accommodating the bike s classic **chain-driven drivetrain**. The **42301-312-000**, which appears to be a companion part (likely a **rear axle nut or locknut**), ensures the axle remains securely fastened to the swingarm, preventing loosening during aggressive riding or when subjected to the vibrations inherent in a single-cylinder engine. Together, these components are essential for riders looking to restore, modify, or upgrade their **1972 SL350/SL 350**, as they address common points of failure in the original design while maintaining the bike s authentic vintage aesthetic. Whether used in a full rebuild, a performance enhancement, or as a preventive maintenance upgrade, this axle set exemplifies the blend of **Japanese engineering precision** and **aftermarket reliability**, making it a valuable addition for any K2 enthusiast aiming to preserve or enhance their motorcycle s functionality and longevity.

### **Analysis of the 1972 Honda SL350 (K2) Rear Axle (Part Numbers: 44301-340-000 and 42301-312-000)**

#### **Overview**

The **1972 Honda SL350 (K2)** is a classic 350cc motorcycle known for its simplicity, reliability, and cult following. The **rear axle (44301-340-000)** and **rear axle housing (42301-312-000)** are critical components for proper function, handling, and durability. Below is a detailed breakdown of the **pros and cons** of purchasing this bike, followed by a conclusion and recommendation.

---

### **Pros of Buying a 1972 Honda SL350 (K2)**

1. **Classic Design & Nostalgia**

- The SL350 has a timeless, retro aesthetic that appeals to enthusiasts who appreciate vintage motorcycles. Its simple, minimalist design is both functional and visually pleasing.

- The bike s **single-cylinder, air-cooled engine** and **chain final drive** give it a raw, unpolished charm that many collectors and riders admire.

2. **Proven Reliability & Simplicity**

- Honda s **436cc (later 350cc) single-cylinder engine** is known for its **durability and straightforward mechanics**. With proper maintenance, these bikes can easily exceed **100,000 miles**.

- The **no-frills design** means fewer components to fail compared to modern bikes, making repairs and modifications easier for those with mechanical skills.

- **Minimal electronics** (no fuel injection, basic ignition) reduce points of failure.

3. **Affordable Maintenance & Parts**

- **Aftermarket support** for the SL350 is strong, with readily available parts from Honda and third-party suppliers.

- **Labor costs** are low compared to modern bikes, as many repairs can be done at home or by a local mechanic familiar with classics.

- **Fuel efficiency** is excellent expect **80 100 mpg**, making it cheap to run.

4. **Great for Learning & Cruising**

- The **lightweight (around 300 350 lbs)** and **low power (around 20 25 hp)** make it ideal for **beginner riders** or those who prefer a **relaxed, leisurely ride**.

- The **upright riding position** is comfortable for long-distance cruising, making it suitable for **weekend rides and touring** (with minimal modifications).

- **No complex suspension tuning** required it handles well on most roads without needing expensive upgrades.

5. **Strong Community & Modding Potential**

- The **SL350 has a dedicated fanbase**, with forums (e.g., **Honda SL350 forums, Classic Honda forums**) offering troubleshooting and project support.

- **Performance tweaks** (porting, carburetor adjustments, exhaust modifications).

- **Comfort upgrades** (saddle, handlebars, windscreen).

- **Aesthetic changes** (custom paint, chrome, or period-correct restorations).

- **Conversion kits** (e.g., to **SL350C, SL350S, or even SL450**) are available for those who want more power or modern features.

6. **Good for Storage & Portability**

- The **compact size** makes it easy to store in a garage or small space.

- **Lightweight** enough to be maneuverable in tight urban areas.

7. **Potential for Restoration & Investment**

- Well-preserved **SL350s** (especially in **original condition or with minimal miles**) can appreciate in value, especially if restored to **showroom condition**.

- **Project bikes** (those needing work) can be restored for **under $3,000 $5,000**, making them an attractive entry point for collectors.

---

### **Cons of Buying a 1972 Honda SL350 (K2)**

1. **Outdated Safety Features**

- **No ABS, traction control, or advanced braking systems** reliance on **drum brakes** (on some models) or **basic disc brakes** (on later models) can be limiting in modern traffic.

- **No modern ergonomics** the **upright position** is comfortable but not ideal for aggressive riding or long-distance comfort for some riders.

- **No modern lighting standards** halogen or older-style bulbs may not meet current regulations in some areas.

2. **Limited Power & Performance**

- The **stock engine produces only 20 25 hp**, making it **slow by modern standards** (0 60 mph in **10 seconds**).

- **No torque** for overtaking on highways passing requires **precise timing and patience**.

- **No modern transmission options** the **4-speed manual** is simple but lacks the smoothness of modern gearboxes.

3. **Maintenance Requirements**

- **Regular upkeep is essential** neglect leads to **chain stretch, bearing wear, and engine issues**.

- **Air-cooled engine** can overheat if ridden aggressively in hot climates.

- **No oil pump** (in some early models) requires **manual oil circulation** during starts, which can be inconvenient.

- **Vulnerable to rust** especially in **suspension components, frame, and exhaust** if stored improperly.

4. **Comfort & Ride Quality**

- **Hard, unsprung seat** not ideal for long rides without modifications.

- **Basic suspension** (if any) early models often have **no rear suspension**, leading to a **bumpy ride**.

- **No wind protection** stock bikes offer **little shielding**, making high-speed riding uncomfortable.

5. **Legal & Insurance Challenges**

- **Modern insurance rates** may be higher due to **limited safety features** and **classic status**.

- **Registration and compliance** can be tricky some states require **modern lighting, mirrors, and turn signals**, which may need retrofitting.

- **Noftification of age** some riders find the **slow speed and lack of power frustrating** in today s fast-paced traffic.

6. **Parts Availability & Costs**

- While parts are **widely available**, **rare or discontinued items** (e.g., specific gaskets, seals) can be **expensive or hard to find**.

- **Replacement axles and housings** (like the ones listed) may require **specialty suppliers**, increasing costs.

- **Labor costs** for classic bikes can be **higher than for modern bikes** due to **limited mechanic expertise**.

7. **Resale Value & Depreciation**

- Unlike some **high-demand classics (e.g., CB750, GSX-R750)**, the **SL350 does not hold value well** unless restored to **showroom condition**.

- **Project bikes** may **lose value** if not completed properly.

8. **Environmental & Noise Concerns**

- **High emissions** (by modern standards) some areas may **restrict or ban older bikes** due to pollution concerns.

- **Loud exhaust** stock SL350s are **very noisy**, which may not be ideal for **urban riding** or noise-sensitive areas.

---

### **Specific Considerations for the Rear Axle (44301-340-000) & Axle Housing (42301-312-000)**

#### **Pros of Replacing or Upgrading These Parts**

- **Improved durability** worn axles can cause **wheel wobble, bearing failure, or chain misalignment**.

- **Better weight distribution** a **straight or modified axle** can enhance handling.

- **Compatibility with upgrades** some riders **extend the swingarm** or **lower the bike**, requiring axle modifications.

- **Prevents long-term damage** a **failing axle housing** can lead to **chain derailment or suspension issues**.

#### **Cons of These Parts**

- **Cost** authentic Honda parts can be **expensive**, especially for **rare or discontinued items**.

- **Fitment issues** aftermarket axles may **not align perfectly**, requiring **custom fabrication**.

- **Weight concerns** some **heavier axles** can affect **handling balance**, especially on a lightweight bike like the SL350.

- **Installation complexity** requires **specialized tools and mechanical skill**, which may not be straightforward for beginners.

---

### **Conclusion & Recommendation**

#### **Who Should Buy a 1972 Honda SL350?**

- **Enthusiasts who love classic, simple motorcycles** and enjoy **restoration projects**.

- **Beginner riders** looking for a **safe, affordable, and easy-to-maintain bike**.

- **Cruisers and weekend riders** who prioritize **nostalgia and low cost** over speed.

- **Those who enjoy modding** and **DIY repairs** (e.g., porting, carb tuning, custom paint).

Details:

Large packages cannot be delivered to P.O. Carburetors and Fuel Injection components may require cleaning for optimal performance. FITMENT: THIS PART WAS REMOVED FROM A 1972 HONDA SL350.

part #: 44301340000 prices

• $29.00-$121.26

specifications cyclevintagee:

• for models: K2, Sl350, Sl, 350
• for makes: Honda
• for years: 1972
• mpn: 44301-340-000
• part type: Axle
• machine type: Street Motorcycle
• color: Silver
• compatible model: Sl350 K2 Sl 350
• material: Chrome, Steel
• vintage part: Yes
• placement on vehicle: Front Wheel, Rear Wheel
• universal fitment: No
• country of origin: Japan

payments cyclevintagee:

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

offer cyclevintagee:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0
• started: May 21, 2026
• best offers: True

general cyclevintagee:

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

seller cyclevintagee:

• rating: 99.9%
• # reviews: 6728
• city: Grants Pass, Oregon

returns cyclevintagee:

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

shipping cyclevintagee:

• cost: $0.00
• transit: 6-9 Days
• type: Fixed
• class: Economy
• service: UPS Ground Saver
• carrier: UPS

Honda 44301-340-000 Is Similar To:

• 06435-kz4-j41 Honda Genuine Parts Rear Brake Pads Oem Crf (24.2% similar) It should fit the following model's: FITS:2012 CRF250X2009 CRF250R2008 CRF450R2008 CRF250X2008 CRF250R2007 CRF450R2007 CRF250X2007 CR250R2007 CR125R2006 CRF450R2006 CRF250X2006 CRF250R2006 CR250R2006 CR125R2005 CRF450R2005 CRF250X2005 CRF250R2005 CR250R2005 CR125R2004 CRF450R2004 CRF250X2004 ...(November 4th, 2018)
• 06435-mz0-006 Honda Gl1500 New Rear (29.4% similar) Honda nos box GL1500C a rear brake caliper 1997 ac GL1500CT 1998 1999 2000 2001 GL1500CD 2002 2003...(August 30th, 2017)
• 08f75-mfe-100 Honda Vt750 Rear Backrest-carrier (29.8% similar) Honda VT750 rear backrest carrier mounting bracket retail...(October 30th, 2017)
• 12310-375-000 12315-375-000 Honda Chrome Rear Cylinder Head Breather Cover Obsolete Part (19.1% similar) Chrome is still in good condition but not perfect. Will look great if cleaned and polished...(October 5th, 2018)
• 12367 Qa Honda Throttle Front Brake Rear Cable Set (30.8% similar) The set includes 1 throttle CABLE,1 front brake cable and rear. Brand new complete cable gray set for the honda QA50...(August 1st, 2018)
• 14520-kv0-720 Honda Vtg Rear Timing Cam Chain Tensioner Mount Bracket (19.1% similar) All of the components are moving properly. Items have some wear. Please with any questions. VG honda VTR250 rear timing cam chain pensioner mount bracket...(June 28th, 2018)
• 14544-kv0-670 Honda Vtg Rear Cylinder Head Timing Cam Chain Guide (22.7% similar) Please with any questions. Guide has some wear marks...(June 28th, 2018)
• 17516-gf5-000 Honda Band Rear Tank Oem Nos Fits (22.8% similar) Note: my site only ships within the USA. Band, rear tank oem honda nos new old stock P/N GF5-000 fits CR60R, CR125R, CR250R and CR500R...(May 27th, 2018)
• 33400-292-670 679 90154-268-670 33602-216-670 Honda Oem Cl Cb Front Rear Turn Signal Lamp Light (19.8% similar) I am willing to answer in a timely manner. Parts may need cleaning, polishing, paint, etc. These pictures are a main part of the. These parts have blemishes, smudging, and scratches due to age, use, storage. I've seen that sometimes sources show wrong parts and numbers. One rear has a straight ...(November 11th, 2018)
• 33600-463-771 Honda Right Rear Turn Signal (23.9% similar) Connector pins in good condition. Wire jackets and protective sleeves flexible with no visible of cracking or weathering. Lens housing reflector shows no signs of damage. Lens housing shows signs of light scratches and rub marks but no gouges or cracks. While I have tried to list all known ...(June 4th, 2018)
• Ch150 33602-kj9-741 Honda Elite 150 125 Right Rear Turn Signal Lens Nos Rare (26.6% similar) Honda CH150 elite right rear turn signal lens nos. Mint mint mint. Factory fresh in the bag...(April 30th, 2016)