BSA 68-896 Pistons Compression .40

( Brand: Bsa ), ( Manufacturer Part Number: 68-896 ), ( Part Type: Piston Compression ), ( Compatible Year: 1964-1967 )

Review BSA Pistons .40 Over Sized To Compression Ratio fits HORNET 650 1964–2010

The **BSA 68-896 1964 Hornet 650** is a legendary piston set designed for the iconic 650cc parallel-twin engine found in BSA Gold Star and Hornet models from the mid-20th century. Crafted with precision engineering, this piston set is a meticulously restored or reconditioned component, tailored to deliver the high-performance characteristics that made the Hornet a favorite among motorcycle enthusiasts and racers. The pistons are forged from high-quality aluminum alloy, ensuring durability and resistance to heat while maintaining optimal weight for smooth operation. With a **40.10mm diameter**, these pistons are engineered to fit snugly within the cylinder bores of the 1964 Hornet, allowing for improved compression and power output when paired with a **10:1 compression ratio** setup ideal for both street use and light track applications. The design incorporates classic Hornet features, such as the distinctive dome-shaped crown and precise ring lands, which enhance combustion efficiency and reduce friction. Whether restoring a vintage machine to its former glory or upgrading an existing engine for better performance, this piston set offers a blend of authenticity and reliability, ensuring that the Hornet s legendary throaty growl and responsive throttle response remain intact. Built to meet the exacting standards of BSA s golden era, these pistons are a must-have for purists and performance seekers alike, bridging the gap between classic engineering and modern tuning.

### **Pros and Cons of Buying a BSA 68-896 1964 Hornet 650 (Pistons 40-10 Compression)**

#### **Pros**

1. **Classic British Design** The BSA Hornet is a well-regarded British motorcycle known for its timeless styling and engineering. Its V-twin layout and classic aesthetics appeal to enthusiasts who value heritage.

2. **Strong Engine Potential** The 650cc parallel-twin engine, particularly with the 40-10 compression pistons, is capable of producing solid power for its era. With proper maintenance and modifications, it can be tuned for better performance.

3. **Durability and Reliability** BSA motorcycles from the 1960s were built to last, with robust construction and simple mechanical designs that are easier to repair than modern, complex engines.

4. **Modification Flexibility** The Hornet s design allows for various upgrades, including cylinder heads, carburetors, and exhaust systems, which can improve performance and drivability.

5. **Community and Parts Availability** As a classic British bike, there is a dedicated community of owners and restorers, making it easier to find parts, manuals, and advice.

6. **Lower Running Costs** Compared to modern motorcycles, fuel, maintenance, and insurance costs are generally lower, especially if the bike is used for occasional riding.

7. **Nostalgia and Collectibility** For riders who appreciate vintage motorcycles, the Hornet holds sentimental value and may appreciate in worth over time if well-maintained.

---

#### **Cons**

1. **High Maintenance Requirements** The engine, particularly with higher compression pistons, may require frequent maintenance, including valve adjustments, chain tensioning, and carburetor tuning. Neglect can lead to costly repairs.

2. **Outdated Technology** The bike lacks modern conveniences such as disc brakes (it likely has drum brakes), electronic ignition, and advanced suspension systems, which can affect safety and comfort.

3. **Fuel Efficiency** The 650cc V-twin is not known for exceptional fuel economy, especially with higher compression. Expect to fill up more often than with a modern bike.

4. **Riding Position and Ergonomics** The upright riding position and heavier weight (likely around 200 220 lbs) may not suit riders seeking a sporty or comfortable modern experience.

5. **Potential for Hidden Issues** A 1964 model with 40-10 compression pistons may have wear in the crankshaft, bearings, or cylinder walls. A thorough inspection by a trusted mechanic is essential to avoid costly surprises.

6. **Limited Modern Comfort** The suspension, seat, and overall ergonomics are not designed for long-distance riding or high-speed stability, which can make it less practical for daily use.

7. **Resale Value Depends on Condition** While classic BSAs can appreciate, their value heavily depends on restoration quality. A poorly maintained example may not hold value or could be difficult to sell.

---

### **Conclusion and Recommendation**

- **Enjoys classic motorcycles** and appreciates vintage engineering.

- **Is willing to invest time and effort** in maintenance and potential upgrades.

- **Prioritizes nostalgia and mechanical challenge** over modern convenience.

- **Plans to use it sparingly** (e.g., for weekend rides or show appearances) rather than daily commuting.

- Riders seeking a **modern, low-maintenance, high-performance** motorcycle.

- Those who prefer **comfort, safety features (disc brakes, ABS), or fuel efficiency**.

- Buyers who want a **practical, long-term investment** without significant upkeep.

If you purchase this bike, **budget for a full inspection** by a BSA specialist to assess engine condition, chain drive wear, and overall mechanical health. Consider restoring it to a **running condition** rather than buying it as a project if you lack mechanical experience. For the right enthusiast, it can be a rewarding and enjoyable ride but it demands respect and attention.

If you re unsure about the commitment, test-ride it thoroughly and research recent service records. Alternatively, consider a **less modified or more modern classic** (e.g., a Triumph Bonneville or a restored 1970s BSA Gold Star) if you want a balance of heritage and practicality.

Details:

BSA A65 Hornet pistons .40 over sized comes with all shown in pics The are original BSA, the rings may not be and require gap adjustment. If shipping is too expensive, I can ship USPS ground.

part #: 68896 price

• $190.00

specifications cyclevintagee:

• for models: 650, Hornet
• for years: 1964-2010
• brand: Bsa
• mpn: 68-896
• part type: Piston Compression
• compatible year: 1964-1967

payments cyclevintagee:

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

offer cyclevintagee:

• quantity: 1
• sold: 0
• availability: In Stock
• started: February 14, 2026
• options: Ship-to-home
• best offers: True

shipping cyclevintagee:

• service: UPS Ground
• class: Standard
• type: Calculated
• cost: $17.56
• carrier: UPS
• transit: 6-12 Days

general cyclevintagee:

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

returns cyclevintagee:

• policy: No Returns

seller cyclevintagee:

• city: Wentzville, Missouri
• # reviews: 1075
• rating: 100.0%

Bsa 68-896 Is Similar To:

• 68-5178 Bsa Fork Outer Sleeves Nos Original Scramblers Hornet (17.6% similar) Sold as a matching pair. Original nos part number is for A65 hornet but fits many Bsa model's with 7 measurement top yoke to pinch bolt you are buying on 2 combined items - a pair...(June 29th, 2018)
• 68-895 Bsa Piston Set Nos Hornet Spitfire Firebird Mm (31.3% similar) 5: fits: A65. Bsa piston full sets 2 part number: hornet, spitfire, fire bird scrambler. 0, bore, 1MM compression: 10. Condition: nos. Includes: pistons, rings, pins, and clips. New in original boxes with paper wrappings. Correct for multiple years...(April 7th, 2018)
• 97 2652 Bsa Pair Victor Hornet Wasp Fork Stanchion Nuts (35.4% similar) Pair Bsa victor hornet wasp fork stanchion nuts...(May 26th, 2018)
• 4259 Hepolite Bsa A65 Cylinder Sleeve Barrel Liner Pair Lightning Spitfire Thunderbolt Hornet (15.5% similar) This will fit all A65 650CC model's including lightning, thunderbolt, spitfire scrambler, hornet, etc. Hi, for sale is one pair 2 new old stock Bsa A65 cylinder sleeve barrel liner to fit all A65'S from it is he polite part number SU4259. This does not bolt on or drop in...(February 27th, 2016)
• Smiths Bg5330 24 Bsa Speedometer Drive 2-1 2 1 Ratio (33.1% similar) Untested drive see pictures untested...(March 27th, 2025)
• Bsa 68-8094 Fiberglass Fuel Tank Hornet Original Needs Paint (40% similar) Any questions I ll try to answer them. Gas cap works as it should. Been painted a few times it appears. I cannot determine if the badge recesses are filled or they were never there. Good candidate for use or core a restoration to look like new. Hornet/spitfire/wasp tank. I cannot be sure of the part...(May 25th, 2025)
• Bsa 68-0734 Crankshaft Early 650 A65 Lightning Thunderbolt Spitfire Hornet Used (24.7% similar) Used Bsa 650 crankshaft assembly 68-0734...(November 18th, 2025)