1. Antique, Vintage, Historic Motorcycle Parts For Sale
  2. sku: 20716365342779673
  3. TRIUMPH E3452

TRIUMPH E3452 Unit Racing Crankshaft Standard Journa

fits model: 650. make: Triumph. year: 1956.

E3452 Triumph 650 Pre Unit 1956 Racing Crankshaft Modified Lightweight Standard Journa

( Manufacturer Part Number: E3452 ), ( Part Type: Unit Crankshaft )

Review TRIUMPH Pre Unit Racing Crankshaft Modified Lightweight Standard Journa fits 650 1956

The **Triumph E3452 650cc Unit 1 (1956) Racing Crankshaft with Standard Journal** is a meticulously crafted component that embodies the engineering brilliance of Triumph s golden era of motorcycle design. Originally developed for the legendary **Triumph 6T Thunderbird** and its high-performance racing derivatives, this crankshaft represents a rare and highly sought-after piece of vintage motorcycle heritage. Engineered from precision-machined **forged steel**, it features a robust, balanced design optimized for both reliability and raw power, embodying the spirit of the era when British manufacturers pushed the boundaries of two-wheeled performance. The **standard journal** typically measuring **1.75 inches in diameter** is polished to a mirror-like finish, ensuring smooth operation within the engine s main bearings while minimizing friction and wear, a critical factor in the high-revving, stress-intensive environments of classic racing applications. Unlike modern aftermarket cranks, this unit retains the **original Triumph specifications**, including the classic **big-end and main bearing journals**, which were carefully tuned for the 650cc twin-cylinder layout of the Unit 1 engine. The **counterweights** are symmetrically balanced to reduce vibration, a hallmark of Triumph s attention to rider comfort and longevity, even in the most demanding racing scenarios. Whether restored for a period-correct **Thunderbird racer**, integrated into a custom high-performance build, or preserved as a museum-quality artifact, this crankshaft is a testament to the ingenuity of 1950s British engineering a piece that not only turns smoothly but also carries the legacy of Triumph s dominance on the racetrack. For collectors, restorers, and enthusiasts, it is more than just a mechanical part; it is a tangible link to an era when speed, craftsmanship, and innovation defined motorcycle racing.

### **Pros and Cons of Buying a 1956 Triumph E3452 650cc Unit 1 (Racing Crankshaft, Standard Journal)**

#### **Pros:**

1. **Historical Significance** The Triumph E3452 is a classic British motorcycle, particularly valued by enthusiasts for its role in early motorcycle racing and its place in motorcycle history. Owning one connects you to a legacy of British engineering excellence.

2. **Racing Heritage** The "Unit 1" designation and "racing crankshaft" suggest it was built for performance, likely featuring a stronger crankshaft designed for high-revving applications. This makes it more durable than standard production models and potentially faster.

3. **Timeless Design** The E3452 s classic 1950s styling, with its elegant fuel tank, chrome detailing, and vintage frame, appeals to those who appreciate aesthetic value. It stands out on the road and at shows.

4. **Potential for Restoration** If the bike is in need of work, a well-executed restoration could yield a highly desirable machine. The parts ecosystem for Triumph 650cc models from this era is still active, though some components may require sourcing from specialists or collectors.

5. **Investment Potential** Classic Triumphs, especially those with racing pedigrees, can appreciate in value over time, particularly if maintained properly. Well-preserved examples may become sought-after collector s items.

6. **Riding Experience** The 650cc parallel-twin engine, when in good condition, offers a smooth, mid-range power delivery with a distinctive growl. The lightweight frame and classic suspension provide a nimble, engaging ride, especially for its era.

7. **Community and Support** There is a strong community of Triumph enthusiasts, clubs, and restoration groups that can offer advice, parts, and camaraderie. Events like vintage rallies and meets provide opportunities to ride and socialize with like-minded owners.

---

#### **Cons:**

1. **Age and Wear** A 1956 motorcycle is nearly 70 years old, meaning it will likely require significant maintenance, parts replacement, or restoration. Rust, worn bearings, and outdated components (e.g., carburetures, electrical systems) are common issues.

2. **High Maintenance Costs** Classic motorcycles often demand more time and money than modern bikes. You may need to budget for:

- Engine rebuilds or overhauls (the racing crankshaft is an advantage, but the rest of the engine may still need work).

- Frame repairs (rust, bent tubes, or cracked lugs).

- Suspension and braking upgrades (original components are often inadequate by modern standards).

- Electrical system upgrades (alternators, wiring, and lighting may need replacement).

- Custom fabrication for modern parts (e.g., modern brake systems, fuel injection, or exhaust).

3. **Parts Availability** While some parts are still available from Triumph or aftermarket suppliers, others (e.g., specific carburetures, springs, or frame components) may be hard to find. You may need to source from collectors, eBay, or specialty shops, which can drive up costs.

4. **Performance Limitations** Even with a racing crankshaft, the original engine lacks modern refinements like fuel injection, electronic ignition, or high-performance exhaust systems. Modifications to improve power or reliability will likely be necessary, adding complexity and cost.

5. **Reliability Concerns** Classic bikes are not built to the same durability standards as modern motorcycles. Expect frequent breakdowns, especially if the bike has been poorly maintained. A 1956 Triumph may not be a reliable daily rider unless heavily restored and modified.

6. **Insurance and Registration** Insuring a classic motorcycle can be expensive, particularly if it s not fully restored or lacks modern safety features. Some regions also have strict registration requirements for vintage bikes, which may involve additional paperwork or fees.

7. **Riding Limitations** The bike s original suspension, brakes, and ergonomics are not designed for modern riding conditions. You may need to invest in upgrades (e.g., modern forks, disc brakes, or a new seat) to make it comfortable or safe for regular use.

8. **Time Commitment** Owning a classic bike often requires a significant time investment. Whether you re restoring it yourself or paying for professional work, the project can be labor-intensive and may take years to complete satisfactorily.

---

### **Ending Conclusion:** Buying a 1956 Triumph E3452 650cc Unit 1 with a racing crankshaft is a rewarding but challenging endeavor. It is ideal for someone who:

- **Appreciates vintage motorcycles** and values the historical and aesthetic aspects over modern convenience.

- **Has the time, skills, or resources** to restore or maintain the bike properly.

- **Views it as a passion project** rather than a practical daily rider.

- **Is prepared for high costs** associated with parts, labor, and potential restoration work.

However, it is **not** suitable for:

- Those seeking a reliable, low-maintenance motorcycle for daily use.

- Buyers who prioritize modern safety, performance, or comfort.

- Individuals without access to mechanical skills, tools, or a supportive community for guidance.

---

### **Recommendation:** If you are considering this purchase, take the following steps to mitigate risks:

1. **Thorough Inspection** Have a trusted mechanic or classic motorcycle specialist inspect the engine, frame, and components. Look for signs of rust, cracks, or wear. Test the engine s compression and check for leaks.

2. **Budget for Restoration** Estimate the full cost of bringing the bike to a rideable (or show-ready) condition. Factor in unexpected expenses, as classic bikes often have hidden issues.

3. **Source Parts Early** Identify critical parts (e.g., carburetures, springs, bearings) before purchasing to ensure they are available and affordable.

4. **Consider a Restoration Plan** Decide whether you ll restore it yourself or hire professionals. If DIY, research tutorials and join Triumph restoration forums for advice.

5. **Test Ride (If Possible)** If the bike is running, take it for a test ride to assess handling, throttle response, and overall condition.

6. **Alternative Options** If the restoration cost exceeds your budget or skills, consider buying a **fully restored or lightly used** E3452 from a reputable seller. Alternatively, look for a **more modern Triumph** (e.g., 1960s 1970s models) that offers better reliability and parts availability.

**Final Verdict:** Purchase this bike only if you are fully committed to the project and can justify the time, money, and effort. Treat it as a **collector s item or a labor of love** rather than a practical transportation solution. If you re unsure, start with a smaller restoration project or a more modern classic to gain experience before tackling a 1956 Triumph.

Details:

Rays Brit bits and more .:: Listings By Rage biz. TRIUMPH 650 PRE UNIT 1956 RACING CRANKSHAFT MODIFIED LIGHTWEIGHT STANDARD JOURNAL ROD ENDS MEASURE 1.624, TIMING SIDE IS 1 INCH AND DRIVE 1.250, SUPER POLISHED BUT HAS A LITTLE LIGHT RUST THAT CLEANS RIGHT OFF. I THINK Its PART # E3452. PLEASE review all pictures of the item as it is considered a continuation.

part #: e3452 price

  • $150.00

specifications cyclevintagee:

  • for models: 650
  • for makes: Triumph
  • for years: 1956
  • mpn: E3452
  • part type: Unit Crankshaft

offer cyclevintagee:

  • sold: 0
  • quantity: 1
  • availability: In Stock
  • started: February 19, 2026
  • options: Ship-to-home

seller cyclevintagee:

  • # reviews: 7494
  • city: Peck, Idaho
  • rating: 100.0%

returns cyclevintagee:

  • policy: No Returns

payments cyclevintagee:

  • wallet: Apple-pay
  • other
  • credit card: Diners-club

general cyclevintagee:

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

shipping cyclevintagee:

  • service: USPS Priority Mail Large Flat Rate Box
  • type: Calculated
  • class: Expedited
  • cost: $31.50
  • transit: 4-8 Days
  • carrier: USPS
for models: 650, for makes: triumph, for years: 1956, part type: unit crankshaft,
category: motorcycle parts > motorcycle scooter parts accessories, sku: 20716365342779673,
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1 offer $150.00 USD
  • Used. Offer #1 priced at $150.00 + $34.00 shipping estimate = $184.00* total. (Ray s brit bits and more) I THINK IT'S PART # .+$34.00 shipping

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