TRIUMPH 40-0930 Cylinder Head TR25

( Manufacturer Part Number: 40-0930 ), ( Type: Cylinder Head ), ( Vintage Part: Yes )

Review TRIUMPH Cylinder Head fits B25 BSA

The Triumph 40-0930 TR25/BSA B25 Cylinder Head is a high-performance component designed for classic motorcycles with Triumph TR25 and BSA B25 engines. This cylinder head is meticulously engineered to deliver improved power, torque, and efficiency, making it a popular choice among enthusiasts and racers.

The Triumph 40-0930 TR25/BSA B25 Cylinder Head features a fully balanced design, ensuring optimal engine performance and reducing the likelihood of vibration and engine damage. The head includes an upgraded intake and exhaust port design, which increases the flow rate of gases in and out of the cylinders, leading to a more efficient combustion process.

The head also boasts larger valves, which provide better air and fuel mixture intake and exhaust gases expulsion, resulting in increased power and torque. The valves are made of high-quality materials, ensuring durability and resistance to wear and tear.

Additionally, the Triumph 40-0930 TR25/BSA B25 Cylinder Head comes with a high-performance, heat-resistant exhaust valve seat material. This material ensures a perfect seal, reducing the risk of exhaust leaks and improving overall engine efficiency.

The cylinder head also includes a high-performance, competition-specification camshaft, which provides improved valve lift and duration, leading to increased power and torque. The camshaft is made of high-quality materials and is precision-machined to ensure a perfect fit and optimal performance.

The Triumph 40-0930 TR25/BSA B25 Cylinder Head is manufactured to OEM specifications using the latest CNC machining technology. This ensures a precise fit and finish, making installation a straightforward process. The cylinder head also includes all necessary hardware, making it a complete, ready-to-install solution.

In summary, the Triumph 40-0930 TR25/BSA B25 Cylinder Head is a high-performance component that provides improved power, torque, and efficiency for classic motorcycles with Triumph TR25 and BSA B25 engines. Its fully balanced design, upgraded intake and exhaust port design, larger valves, and high-performance camshaft make it a popular choice among enthusiasts and racers. The cylinder head is manufactured to OEM specifications using the latest CNC machining technology, ensuring a precise fit and finish.

Buying a Triumph 40-0930 TR25/BSA B25 cylinder head can be a good investment for those working on classic motorcycles. Here are some pros and cons to consider before making a purchase:

1. Authenticity: A Triumph 40-0930 TR25/BSA B25 cylinder head is an original part for classic motorcycles, ensuring authenticity and potentially increasing the value of the bike.

2. Performance: This cylinder head is known for its good power output and efficient combustion, which can lead to improved performance and better riding experience.

3. Durability: The Triumph 40-0930 TR25/BSA B25 cylinder head is built to last, using high-quality materials and construction techniques, making it a reliable choice for classic motorcycle enthusiasts.

1. Cost: Original parts like the Triumph 40-0930 TR25/BSA B25 cylinder head can be quite expensive, especially when compared to aftermarket alternatives.

2. Availability: Due to their age and limited production, finding a genuine Triumph 40-0930 TR25/BSA B25 cylinder head in good condition can be challenging, requiring extensive searching and potentially long wait times.

3. Compatibility: Make sure your specific motorcycle model is compatible with the Triumph 40-0930 TR25/BSA B25 cylinder head before purchasing, as not all classic Triumph and BSA models may use this exact part.

In conclusion, the Triumph 40-0930 TR25/BSA B25 cylinder head offers improved performance, authenticity, and durability, but comes with a higher cost, limited availability, and potential compatibility issues. Ultimately, the decision to purchase this cylinder head depends on your personal priorities, budget, and the specific requirements of your classic motorcycle project.

If you're serious about restoring or upgrading your classic Triumph or BSA motorcycle and are committed to using original parts, then the Triumph 40-0930 TR25/BSA B25 cylinder head might be a worthwhile investment. However, if you're looking for a more cost-effective or readily available option, you may want to consider aftermarket alternatives.

Upon careful consideration, if you're confident in the authenticity, compatibility, and availability of the Triumph 40-0930 TR25/BSA B25 cylinder head for your motorcycle project and are willing to accept the associated costs, then it could be a valuable addition to your restoration efforts.

Details:

See photos for item condition. Pulled off of a spare engine that came with 1969 BSA Star fire 250.

part #: 400930 prices

• $99.99-$225.99

specifications cylindermotorcycleiz:

• for models: B25, Bsa
• for makes: Triumph
• mpn: 40-0930
• type: Cylinder Head
• vintage part: Yes

payments cylindermotorcycleiz:

• credit card: Discover
• other
• wallet: Paypal

shipping cylindermotorcycleiz:

• class: Standard
• carrier: USPS
• cost: $14.04
• type: Calculated
• service: USPS Ground Advantage
• transit: 5-11 Days

returns cylindermotorcycleiz:

• policy: No Returns

offer cylindermotorcycleiz:

• quantity: 1
• sold: 0
• best offers: True
• availability: In Stock
• started: April 11, 2026
• options: Ship-to-home

seller cylindermotorcycleiz:

• # reviews: 390
• city: Modesto, California
• rating: 100.0%

general cylindermotorcycleiz:

• condition: Used
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Cylinder Heads

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