TRIUMPH BSA 71-2366 Nos Valve Spring Base Set Bu

( Brand: Triumph Bsa ), ( Manufacturer Part Number: 71-2366 ), ( Part Type: Valve Spring )

Review TRIUMPH BSA New Nos Valve Spring Base Part Set Of Four One Used Bu fits 650 750

The **Triumph BSA 71-2366 NOS (New Old Stock) Valve Spring Base Set** for the 650cc and 750cc parallel-twin engines is a meticulously preserved, high-performance component designed to restore or enhance the reliability and performance of these legendary British motorcycles. Originally crafted for Triumph s iconic BSA-powered twins such as the Triumph Bonneville, Twin Gun, and Speed Twin this valve spring base set is a critical assembly that ensures proper valve operation, reducing the risk of valve float at high RPMs and preventing catastrophic engine failure. The set includes a complete set of valve springs, retainers, keepers, and often a valve spring compressor tool, all of which are essential for maintaining precise valve clearance and optimal engine breathing. As a NOS part, this assembly has been carefully selected from stock that has remained in its original packaging or packaging with minimal handling, ensuring it is free from wear, corrosion, or aftermarket modifications that could compromise performance. The springs are typically made from high-grade steel, designed to withstand the demanding cycles of high-revving engines while maintaining consistent tension, which is vital for both stock and modified applications. Whether used for a restoration project to return a vintage Triumph to its original glory or for a performance upgrade to squeeze out extra power, this valve spring base set is a trusted choice among enthusiasts and mechanics alike. Its compatibility with a wide range of BSA-based Triumph models including those from the 1960s through the early 1970s makes it a versatile and valuable addition to any workshop focused on preserving or pushing the limits of these timeless machines.

The Triumph BSA 71-2366 NOS (New Old Stock) valve spring base set is a highly sought-after aftermarket part for classic Triumph and BSA motorcycles, particularly those from the 1960s and early 1970s. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros of buying a Triumph BSA 71-2366 NOS Valve Spring Base Set**

1. **Authentic and Original**

The NOS designation means this part was never installed on a motorcycle and has been preserved in its original condition. This ensures you re getting a genuine, unmodified component that matches the factory specifications of your bike. For enthusiasts who prioritize period-correct restoration, this authenticity is invaluable.

2. **High Quality and Durability**

The valve springs and related components from this era were built to last, using materials and manufacturing standards that, while not as refined as modern parts, were robust for their time. The springs are designed to handle the specific valve train dynamics of Triumph and BSA engines, reducing the risk of premature failure if installed correctly.

3. **Compatibility with Classic Engines**

This valve spring base set is designed for the 650cc and 750cc Triumph and BSA parallel-twin engines, particularly those from the 1960s and early 1970s (e.g., Triumph Bonneville, BSA Gold Star, Triumph Trident, BSA Rocket 3). It fits engines with the same valve spring configuration, making it a direct replacement for worn or damaged springs.

4. **Preservation of Engine Performance**

Worn valve springs can lead to poor valve closure, reduced compression, and potential valve float at high RPM. Replacing them with NOS parts restores the engine s original performance characteristics, ensuring proper valve operation and maintaining the bike s intended power delivery.

5. **Investment Potential**

NOS parts, especially those in good condition, can appreciate in value over time. If you re restoring a classic motorcycle, investing in NOS components like this valve spring set can enhance the bike s collectible value. Additionally, if you ever decide to sell the bike, having original parts can make it more attractive to collectors.

6. **Avoiding Modern Part Compromises**

Modern valve springs and related components may not perfectly replicate the feel, performance, or durability of original parts. NOS springs can provide a more "period-accurate" experience, which is important for riders who prioritize authenticity over convenience.

7. **Support for Classic Motorcycle Culture**

Purchasing NOS parts supports the preservation of classic motorcycle heritage. These parts are often sourced from dismantlers or private collections, and their availability can be limited. Buying them helps sustain the aftermarket for vintage bikes.

---

### **Cons of buying a Triumph BSA 71-2366 NOS Valve Spring Base Set**

1. **High Cost**

NOS parts are significantly more expensive than their modern or rebuilt counterparts. The value of these parts is tied to their scarcity and historical significance, which can make them prohibitively expensive for budget-conscious restorers. Prices can range from several hundred to over a thousand dollars, depending on condition and demand.

2. **Limited Availability**

NOS parts are not mass-produced, and their availability is often unpredictable. You may spend considerable time searching for a seller, and even then, the part may not be available when you need it. This can delay restoration projects or require you to compromise on quality by using non-NOS alternatives.

3. **Condition and Quality Variability**

While NOS parts are original, their condition can vary widely. Some may show signs of wear, corrosion, or damage despite being unused. You ll need to inspect the springs, retainers, and valve springs carefully for any defects. A poorly maintained NOS part can be worse than a modern replacement in terms of reliability.

4. **Installation Challenges**

Installing NOS valve springs may require more effort than modern parts. The springs and related components (e.g., retainers, keepers, and valve springs) may need to be carefully measured and fitted to ensure proper function. If you re not experienced with engine work, you may need to consult a mechanic or use a specialist to install them correctly.

5. **Potential for Overkill**

If your engine is not in excellent condition otherwise (e.g., worn camshafts, valves, or guides), replacing just the valve springs with NOS parts may not significantly improve performance or longevity. The benefits of NOS springs are maximized when paired with other restored or high-quality components.

6. **Ethical Concerns**

The NOS market can sometimes involve unethical practices, such as parts being "reconditioned" or "relabeled" as NOS when they are not. It s important to verify the authenticity and history of the part with the seller to avoid being misled. Reputable sellers will provide documentation or provenance to support the NOS claim.

7. **Storage and Handling Risks**

NOS parts are often stored in environments that may not be ideal for long-term preservation. Exposure to moisture, dust, or improper storage can degrade the parts over time, even if they were unused. Handling them roughly during installation can also cause damage.

8. **Limited Longevity Compared to Modern Parts**

While NOS springs are durable, they may not last as long as modern valve springs, which are often designed with improved materials and heat treatments. If you plan to use the bike frequently or for long-distance riding, you may need to replace them sooner than you would with modern alternatives.

---

### **Conclusion**

The Triumph BSA 71-2366 NOS valve spring base set is a premium choice for enthusiasts restoring or maintaining classic Triumph and BSA motorcycles. Its authenticity, historical significance, and potential to enhance performance make it a desirable part for those committed to period-correct restoration. However, the high cost, limited availability, and potential variability in condition require careful consideration.

For riders who prioritize authenticity and are willing to invest in the long-term preservation of their bike s heritage, the NOS valve spring set is an excellent choice. On the other hand, those on a tighter budget or seeking convenience may find modern or rebuilt alternatives more practical. Additionally, if the engine s other components are not in optimal condition, the benefits of NOS springs may be diminished.

Ultimately, the decision depends on your priorities: whether you value historical accuracy and the potential for increased collectible value over cost and convenience.

---

### **Recommendation**

Proceed with purchasing the NOS valve spring set, provided you can afford the cost and are prepared for the potential challenges of sourcing and installing it. Verify the part s condition thoroughly and consider consulting a specialist mechanic if you re unsure about installation. Pair this with other NOS or high-quality components to maximize the benefits.

Consider modern or rebuilt valve spring sets from reputable manufacturers (e.g., Triumph Performance Parts, BSA, or aftermarket brands like B&M or Dyno). These options offer good performance at a fraction of the cost and are widely available. Ensure they are compatible with your engine s specifications.

Before investing in NOS springs, have a mechanic inspect the camshafts, valves, valve guides, and other related components. If these are worn, address them first to ensure the valve springs will function optimally.

Weigh the long-term durability of NOS springs against modern alternatives. Modern springs may offer better longevity, especially if you ride aggressively or frequently.

In summary, the NOS valve spring set is ideal for purists and collectors, but it is not the only viable option. Evaluate your needs, budget, and priorities to make the best decision for your project.

Details:

NEW NOS TRIUMPH 650 750 VALVE SPRING BASE PART # 71-2366 SET OF FOUR ONE USED BUT IS AND IN GREAT SHAPE, THE OTHER 3 ARE OLD STOCK. Rays Brit bits and more .:: Listings By Rage biz.

part #: 712366 price

• $20.00

specifications cyclevintagee:

• for models: 650, 750
• for makes: Triumph
• brand: Triumph Bsa
• mpn: 71-2366
• part type: Valve Spring

payments cyclevintagee:

• wallet: Paypal
• other
• credit card: Discover

returns cyclevintagee:

• policy: No Returns

offer cyclevintagee:

• quantity: 1
• sold: 0
• availability: In Stock
• started: February 22, 2026
• options: Ship-to-home

seller cyclevintagee:

• # reviews: 7496
• city: Peck, Idaho
• rating: 100.0%

general cyclevintagee:

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

shipping cyclevintagee:

• carrier: FedEx
• class: Standard
• type: Calculated
• transit: 5-9 Days
• service: FedEx Ground / FedEx Home Delivery
• cost: $19.48

Triumph Bsa 71-2366 Is Similar To:

• 01-91 Sparky Bsa Triumph Norton Harley Davidson Lucas Magneto Spark Plug (26.9% similar) Ideal for older vintage machines requiring anon-resistor cap. Also excellent for vintage snowmobiles and other engines. 1960 S sparky spark plug casabas Triumph Norton Harley Davidson Lucas magneto caps made of flexible neoprene rubber for a snug fit over...(September 12th, 2018)
• 13469 Nos Triumph Tiger Cub (25.2% similar) Includes 1 piston, sets of rings, piston pin and 2 clips. This is a standard bore piston set. A very rare part. Up for offer is a new old stock piston set your Triumph tiger cub. These were made back in the 1970 S by MC supply, they are japan and a very high quality piston. 5 to 1 compression ratio...(November 6th, 2017)
• 14-0902 Nos Lot Of Nut Triumph (12.3% similar) This is a nos lot of 15 nut 5/1 6X24 its Triumph...(December 31st, 2018)
• 19378-kr Hepolite Nos Triumph Hi Compression Piston Tr (24.6% similar) 5:1 compression.s fits 750 Bonneville or tiger model's. These are getting very rare and hard to find. He polite pistons with rings and pins...(March 22nd, 2018)
• 12-608 609 Choke Lever For 1960s 70s Bsa Triumph Norton (20.1% similar) Choke lever for 1960 S Bsa Triumph Norton. For 7/8 bars, looks right hand part. Some scrapes on top face otherwise, chrome is quite good. Handlebar mount. With clamp and screws part or 609 for most '60S '70S era Triumph, Bsa, and Norton model's...(February 20th, 2016)
• 200713 Lucas Nos Triumph Bsa (19.6% similar) I combine shipping. 1STKICKCYCLES. Please see photo double check part number to make sure it fits your motorcycle before buying. Please see my many other offers and listings. Genuine oem part. All parts are original genuine nos Triumph, they may show shelf ware or need dusting from decades of ...(August 24th, 2017)
• 21-1871 Jrc Spares Nos Plug Tach Drive Lh Thread Triumph (10% similar) This is a nos plug teach drive LHS thread fits Triumph...(January 25th, 2019)
• 2305508 Triumph New Oem Left (28.6% similar) New oem part, fast shipping...(March 26th, 2017)
• 315738 82-5412 82-5687 F5412 F5687 Domiracer Replacement Triumph Rear Brake Light Switch Clip Spring (19.6% similar) This is something that dormice had made with the replacement Lucas shinguard mounted rear brake light stop lamp switch came on Triumph 650 twins T120 TR6 6T. Keep your eyes open for other rarities in my future listings. So, I bought them back. Dormice closed down on, but I still deal in European ...(August 17th, 2018)
• 3412w-3404w Koken Tool Co Triumph Norton Bsa Whitworth Pt Socket Set (26.3% similar) Whit worth sockets are sizes 3412W 7/8 BS3 8, 3410W 3/8 BS5 16, 3408W 5/1 6BS1 4, 3406W 1/4 BS3 4304W standard set in metal box are sizes 7/8 , 25 32, 3/4 , 11 16, 5 true craft fine tooth ratchet...(May 16th, 2018)
• 37-0906complete-37-0905 Triumph Mark Ii Spring Hub Parts (34.3% similar) Used fits all 650CC twin cylinder model's from 1950. Hub has been polished. Very hard to find in this good of condition. This is the latest model called mark ii sprung hub rear wheel unit. No cracks, welds or bad threads. Has been in storage since ready to mount and ride...(November 30th, 2018)