What is the engine displacement of the 1951 Harley-Davidson S-125?

The 1951 Harley-Davidson S-125 has an engine displacement of 165.00 ccm (10.07 cubic inches).

How much does the 1951 Harley-Davidson S-125 weigh?

The 1951 Harley-Davidson S-125 has a dry weight of 90.7 kg (200.0 pounds).

1951 Harley-Davidson S-125 Price, Specs, Review

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Review

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The Harley-Davidson S-125, introduced in 1951, represents a unique chapter in the storied legacy of the iconic American motorcycle brand. With its compact 125cc two-stroke engine, the S-125 was designed to provide an accessible entry point into the world of motorcycling, appealing to new riders and those seeking a lightweight, nimble bike. This model featured a distinctive design that combined traditional Harley aesthetics with practical functionality, including a minimalist frame and a straightforward, user-friendly layout. The bike's performance, though modest by today's standards, offered a spirited ride that allowed riders to navigate urban environments effortlessly. In terms of value, the S-125 has become a sought-after classic among collectors and enthusiasts, not only due to its rarity but also because of its place in Harley-Davidson's history as one of the brand's few forays into smaller displacement motorcycles. Its charm lies in its simplicity and reliability, traits that resonate with those who appreciate the nostalgia of classic bikes. Restorations and original models are increasingly prized, often commanding respect and attention at vintage motorcycle shows. Overall, the Harley-Davidson S-125 stands as a testament to the brand's ability to adapt and innovate, capturing the essence of freedom and adventure that defines motorcycling culture.

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Pros (Advantages)
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✅ Why buy this bike?
Classic Design: The S-125 features a timeless design that captures the essence of the early 1950s motorcycles, appealing to vintage enthusiasts and collectors alike.Lightweight and Maneuverable: Weighing in at just around 125cc, the S-125 is lightweight and easy to handle, making it suitable for new riders and urban commuting.Reliable Engine: The bike is equipped with a dependable single-cylinder, two-stroke engine, known for its simplicity and ease of maintenance, which contributes to its long-lasting performance.Affordability: As one of the smaller displacement motorcycles produced by Harley-Davidson, the S-125 is generally more affordable than larger models, allowing entry into the Harley-Davidson community without a hefty price tag.Cultural Icon: Owning an S-125 connects riders to a significant part of motorcycle history, representing Harley-Davidson's efforts in producing smaller, more accessible bikes during a transformative era in motorcycling.

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Cons (Disadvantages)
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⚠️ Things to consider
Limited Power and Performance: The S-125 is equipped with a smaller 125cc engine, which may not provide the power and acceleration that riders expect from a Harley-Davidson, especially when compared to larger models.Basic Features: As a model from the early 1950s, the S-125 lacks modern features and technology, such as advanced suspension, fuel injection, and electronic ignition, which can affect ride comfort and overall performance.Vibration and Comfort: Due to its smaller engine and vintage design, riders may experience more vibration at higher speeds, which can lead to discomfort on longer rides.Availability of Parts: Being a classic model, finding replacement parts for the S-125 can be challenging. This can lead to increased maintenance costs and longer downtime when repairs are needed.Limited Riding Range: The smaller fuel tank capacity may limit the riding range, requiring more frequent stops for refueling during longer journeys, which can be inconvenient for some riders.

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Alternatives
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⚖️ Comparison & Competition
Indian Chief (1940s-1950s)The Indian Chief is a classic American cruiser known for its distinctive styling and powerful V-twin engine. With its smooth ride and iconic fenders, the Chief embodies the spirit of American motorcycling while delivering a comfortable experience for long-distance travel.Norton Dominator 88 (1950-1955)The Norton Dominator 88 is a British parallel-twin motorcycle that offers a blend of performance and style. Renowned for its handling and agility, it features a sleek design and a reliable engine, making it a popular choice among enthusiasts of the era.BSA Gold Star (1938-1963)The BSA Gold Star is a legendary British motorcycle known for its racing pedigree and performance. With its single-cylinder engine, it was celebrated for its speed and lightweight frame, making it a favorite among competitors and casual riders alike during the post-war period.Triumph Thunderbird (1950-1966)The Triumph Thunderbird is a classic British motorcycle that gained fame for its robust design and powerful parallel-twin engine. Its combination of style and performance made it a staple in the motorcycle community, appealing to both cruisers and sport riders.Vincent Black Shadow (1948-1955)The Vincent Black Shadow is an iconic motorcycle recognized for its engineering excellence and speed. With a V-twin engine that offers impressive performance, it was considered one of the fastest production motorcycles of its time, garnering a cult following among collectors and enthusiasts. These alternatives each represent unique facets of motorcycle history, showcasing the diversity in design and engineering during the mid-20th century

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License Class (EU)
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Rule of thumb: under 125cc / 15HP → A1, under 47HP → A2, above → A.

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Fuel Economy & Running Costs
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Estimated average for 165cc class: 55-80 mpg (3.0-4.5 L/100km)

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Insurance Class
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Insurance grouping for Harley-Davidson S-125 (165cc):

📋 Group 8-15 — mid-range

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Insurance Calculator (UK est.)
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Personalised premium estimate for the Harley-Davidson S-125 (UK rates):

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💡 Estimate based on UK market averages. For real quotes, compare on Compare the Market, MoneySuperMarket, GoCompare.

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Price Estimate
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Estimated price range for the Harley-Davidson S-125 based on comparable motorcycles:

AVERAGE

$1,980

📊 Category-based (20 motorcycles) · Approximate (USD)

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Buy New & Used
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Find new and used Harley-Davidson S-125 1951 listings:

🛒 eBay Motors 🏍️ Cycle Trader 🇬🇧 Auto Trader UK 🔍 Google Listings

💡 Third-party listings. MotoBike Info is informational only.

👤 Final premium varies by rider age, history, location.

⚙️ Full Specifications

No specifications found.

📋 Detailed Review

The Harley-Davidson S-125, introduced in 1951, represents a unique chapter in the storied legacy of the iconic American motorcycle brand. With its compact 125cc two-stroke engine, the S-125 was designed to provide an accessible entry point into the world of motorcycling, appealing to new riders and those seeking a lightweight, nimble bike. This model featured a distinctive design that combined traditional Harley aesthetics with practical functionality, including a minimalist frame and a straightforward, user-friendly layout. The bike's performance, though modest by today's standards, offered a spirited ride that allowed riders to navigate urban environments effortlessly. In terms of value, the S-125 has become a sought-after classic among collectors and enthusiasts, not only due to its rarity but also because of its place in Harley-Davidson's history as one of the brand's few forays into smaller displacement motorcycles. Its charm lies in its simplicity and reliability, traits that resonate with those who appreciate the nostalgia of classic bikes. Restorations and original models are increasingly prized, often commanding respect and attention at vintage motorcycle shows. Overall, the Harley-Davidson S-125 stands as a testament to the brand's ability to adapt and innovate, capturing the essence of freedom and adventure that defines motorcycling culture.

🎬 Video Reviews

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⚡ Key Specs

Displacement165.00 ccm (10.07 cubic inches)

Weight90.7 kg (200.0 pounds)

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Harley-Davidson S-125

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