The 1991 Harley-Davidson FLSTF, often called the Fat Boy, is an iconic cruiser. Introduced in 1990, it quickly became popular for its distinctive styling and robust V-twin engine. Known for its wide handlebars, fat tires, and chrome accents, the FLSTF embodies a classic American motorcycle aesthetic. This model typically featured the 80 cubic inch Evolution engine. Its popularity stems from its timeless design and the unmistakable Harley-Davidson riding experience, making it a sought-after classic.
The Good
The 1991 FLSTF offers a powerful, torquey engine for satisfying rides, coupled with a comfortable, laid-back riding position. Its legendary V-twin sound and classic, eye-catching design appeal to emotional desires, while its solid build and enduring style provide practical value.
The Bad
Potential weaknesses for the 1991 FLSTF include the age-related wear and tear common in vintage motorcycles. Buyers should watch out for leaks from the engine or transmission, aging electrical components, and potential brake system issues. The carburetor can also require periodic tuning.
1991 Harley-Davidson FLSTF: Quick Overview
- Engine: The 1991 Harley-Davidson FLSTF was equipped with the 80 cubic inch (1340cc) Evolution V-twin engine. This air-cooled engine was a staple for Harley-Davidson during this era, known for its distinctive rumble and broad torque curve.
- Horsepower: Official horsepower figures for this era were often conservatively rated. The 1340cc Evolution engine typically produced around 50-55 horsepower at the crankshaft.
- Torque: This engine was primarily known for its torque, generally around 65-70 ft-lbs, providing strong acceleration from a standstill and effortless cruising.
- Fuel Economy: Fuel economy for the 1991 FLSTF is modest. Expect figures in the range of 35-45 miles per gallon (MPG), depending on riding style and conditions.
- 0-60 Times: Acceleration was not the primary focus for this cruiser. 0-60 mph times were generally in the 5-6 second range, adequate for its intended purpose but not performance-oriented.
- Towing Capacity: As a cruiser motorcycle, the FLSTF is not designed or rated for towing. Towing capacity is effectively zero.
- Transmission: A 5-speed constant mesh manual transmission was standard.
- Brakes: Typically featured a single front disc brake and a rear disc brake.
- Suspension: Front telescopic forks and a rear swingarm with dual shock absorbers.
- Trim-Level Features: The FLSTF (Fat Boy) trim was characterized by its distinctive styling cues: a wide, silver headlight nacelle, wide handlebars, chrome spoke wheels with solid aluminum discs, wide whitewall tires, and a teardrop-shaped fuel tank. It also featured a low seat height for comfortable cruising and a classic teardrop tail light. The overall aesthetic emphasized a vintage, powerful cruiser look.
1991 Harley-Davidson FLSTF Specifications
Vehicle Information
| Year | 1991 |
| Make | Harley-Davidson |
| Model | FLSTF |
| Trim | - |
| Style | - |
| Type | Motorcycle |
| Category | Motorcycle |
Manufacturing Details
| Made In | United States |
| Manufacturing City | YORK |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 1340CC |
| Engine Size | 1340L |
| Engine Cylinders | 2 |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | - |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
Vehicle History Report
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What Problems Does the 1991 Harley-Davidson FLSTF Have?
The 1991 Harley-Davidson FLSTF, like many motorcycles of its era, has known potential issues that arise with age and mileage. One common area of concern is related to the Evolution engine, particularly the **crankcase breather system**. Over time, these can clog, leading to oil leaks or pressure buildup. Owners often report the need for regular maintenance of the **carburetor**, which may require cleaning and adjustment to maintain smooth running. Another area to scrutinize is the **electrical system**. Aging wiring harnesses, connectors, and the voltage regulator can be prone to failure. The **clutch and primary drive** components can also show wear, especially on higher-mileage examples. Transmission issues, while not rampant, can occur, often manifesting as difficulty shifting or false neutrals. Brake system components, such as seals and master cylinders, may also require attention due to age. Recall information for specific model years is often found through VIN lookups, but general wear and tear are more common than widespread factory defects for this vintage. Long-term reliability is generally good if the motorcycle has been consistently maintained with quality parts and regular service. However, neglected examples can quickly develop a cascade of problems. The 1991 model year itself did not have exceptionally widespread unique issues compared to other early Evolution Big Twin models, but all the general age-related concerns apply. Attention to detail during pre-purchase inspection is crucial.
How long will the 1991 Harley-Davidson FLSTF last?
Based on owner data and maintenance habits, a well-maintained 1991 Harley-Davidson FLSTF can easily surpass 100,000 miles, with many reaching 150,000 miles or more. The Evolution engine is known for its robustness and can be rebuilt for extended service life. Durability is high, provided routine maintenance is performed diligently. Weaknesses that emerge over time typically relate to age rather than inherent design flaws. These can include wear on the transmission, clutch, suspension components, and electrical systems. However, with proper care, these are often manageable and repairable, allowing the FLSTF to remain a reliable rider for decades.
What Technology & Safety Features are Included?
The 1991 Harley-Davidson FLSTF represents a simpler era of motorcycling, focusing on the core riding experience rather than advanced technology. Consequently, built-in tech, entertainment, driver-assistance, and safety features are very minimal.
Technology: The primary technological feature is the engine itself and the 5-speed transmission. Instrumentation is basic, typically consisting of a speedometer, odometer, and a few indicator lights for oil pressure, turn signals, and high beam. There is no onboard computer, GPS, or digital displays.
Entertainment: Entertainment is solely derived from the rider's interaction with the machine and the environment – the rumble of the V-twin, the wind, and the open road. There are no integrated audio systems or connectivity features.
Driver-Assistance Features: Driver-assistance features are non-existent. The rider is entirely in control of the motorcycle's operation. There are no electronic aids such as traction control, ABS, or cruise control available from the factory for this model year.
Safety Features: Safety features are limited to the mechanical components of the motorcycle. These include standard front and rear disc brakes for stopping power and the inherent stability of its cruiser design. The large, often whitewall tires contribute to its distinctive look but are not considered a modern safety feature.
Optional Features: While factory options were relatively limited compared to modern vehicles, some common additions from dealers or aftermarket suppliers could include saddlebags for storage, a windshield for wind protection, upgraded exhaust systems for sound and performance, and custom seats for enhanced comfort.
Crash-Test Ratings: Motorcycles of this vintage do not undergo standardized crash-testing in the same way that automobiles do. Therefore, there are no official crash-test ratings available for the 1991 Harley-Davidson FLSTF. Rider safety is primarily dependent on rider skill, protective gear, and adherence to traffic laws.
Technology: The primary technological feature is the engine itself and the 5-speed transmission. Instrumentation is basic, typically consisting of a speedometer, odometer, and a few indicator lights for oil pressure, turn signals, and high beam. There is no onboard computer, GPS, or digital displays.
Entertainment: Entertainment is solely derived from the rider's interaction with the machine and the environment – the rumble of the V-twin, the wind, and the open road. There are no integrated audio systems or connectivity features.
Driver-Assistance Features: Driver-assistance features are non-existent. The rider is entirely in control of the motorcycle's operation. There are no electronic aids such as traction control, ABS, or cruise control available from the factory for this model year.
Safety Features: Safety features are limited to the mechanical components of the motorcycle. These include standard front and rear disc brakes for stopping power and the inherent stability of its cruiser design. The large, often whitewall tires contribute to its distinctive look but are not considered a modern safety feature.
Optional Features: While factory options were relatively limited compared to modern vehicles, some common additions from dealers or aftermarket suppliers could include saddlebags for storage, a windshield for wind protection, upgraded exhaust systems for sound and performance, and custom seats for enhanced comfort.
Crash-Test Ratings: Motorcycles of this vintage do not undergo standardized crash-testing in the same way that automobiles do. Therefore, there are no official crash-test ratings available for the 1991 Harley-Davidson FLSTF. Rider safety is primarily dependent on rider skill, protective gear, and adherence to traffic laws.
What Colors Options are Available?
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In the meantime, feel free to explore the other sections for more content.
1991 Harley-Davidson FLSTF Prices and Market Value
When new, the 1991 Harley-Davidson FLSTF Fat Boy had a manufacturer's suggested retail price (MSRP) that typically ranged between $12,000 and $14,000, depending on optional accessories and specific configurations. As a classic motorcycle, the FLSTF has experienced a unique depreciation curve. While most vehicles depreciate heavily in their early years, the Fat Boy, particularly iconic models like the 1991, has largely stabilized and often appreciated in value due to its status as a collectible.
Current used market prices vary significantly based on mileage, condition, originality, and maintenance history. Well-maintained examples in good to excellent condition can command prices from $8,000 to $15,000 or even higher for pristine, low-mileage machines. Factors affecting resale value include the presence of original parts, a documented service history, rarity of specific color schemes, and the overall aesthetic appeal. Collectors and enthusiasts are willing to pay a premium for well-preserved Fat Boys that represent a significant chapter in Harley-Davidson's history.
Current used market prices vary significantly based on mileage, condition, originality, and maintenance history. Well-maintained examples in good to excellent condition can command prices from $8,000 to $15,000 or even higher for pristine, low-mileage machines. Factors affecting resale value include the presence of original parts, a documented service history, rarity of specific color schemes, and the overall aesthetic appeal. Collectors and enthusiasts are willing to pay a premium for well-preserved Fat Boys that represent a significant chapter in Harley-Davidson's history.
1991 Harley-Davidson FLSTF Cost of Ownership
Owning a 1991 Harley-Davidson FLSTF can be a rewarding experience, but it's not typically considered economical. Insurance costs can vary widely based on rider experience, location, and coverage levels, but expect it to be more than for a typical commuter vehicle. Fuel costs are moderate, with its 1340cc engine delivering around 35-45 MPG. Maintenance and repair are where costs can accumulate. While the Evolution engine is durable, parts and specialized labor for vintage Harleys can be expensive. Regular maintenance is crucial to prevent costly repairs. Overall, the FLSTF is a passion purchase rather than an economical choice; long-term ownership costs are moderate to high, especially if extensive restoration or custom work is desired.
1991 Harley-Davidson FLSTF Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
1991 Harley-Davidson FLSTF Warranty
Basic
Original warranty
0 months / No data
Estimated remaining
Expired
Powertrain
Original warranty
0 months / No data
Estimated remaining
Expired
Rust
Original warranty
0 months / No data
Estimated remaining
Expired
1991 Harley-Davidson FLSTF Insurance
Insurance for a 1991 Harley-Davidson FLSTF is moderately priced, reflecting its status as a Motorcycle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1991 Harley-Davidson FLSTF Compare to Other Motorcycle?
The 1991 Harley-Davidson FLSTF Fat Boy carved out a unique niche in the cruiser market, but it had contemporaries and subsequent models that offered different strengths.
Performance: In terms of raw acceleration and top-end speed, the FLSTF was not a performance leader. Its V-twin offered strong, satisfying torque for cruising, but rivals like some Japanese cruisers from Yamaha (e.g., V-Star series) or Honda (e.g., Shadow series) might offer smoother power delivery and slightly quicker 0-60 times. Harley's iconic rumble and character, however, are unmatched.
Features: The FLSTF was intentionally minimalist, focusing on its iconic styling. Competitors, especially later Japanese models, began offering more creature comforts like basic infotainment, cruise control, and more advanced braking systems. Harley's appeal was its authentic, stripped-down experience.
Reliability: Harley-Davidson V-twin engines from this era, especially the Evolution, are known for their durability when properly maintained. However, they often require more frequent and specialized maintenance than their Japanese counterparts. Some Japanese brands like Honda historically boasted superior reliability with less frequent maintenance needs.
Price: New, the Fat Boy was a premium offering. Today, used prices for a 1991 FLSTF are often in a similar or higher bracket compared to similarly aged Japanese cruisers, reflecting its iconic status and collector appeal.
Alternatives:
* Similar: The **Harley-Davidson FLHS Electra Glide Sport** (if a bagger style is preferred) or **FLHTC Electra Glide Classic** offer more touring amenities but share the same engine platform. Other Harley-Davidson Softail models from the era offer a similar ride feel.
* Different Style, Similar Era: A **1991 Honda Shadow VT1100C** or a **Yamaha XV1100 Virago** would offer comparable engine size and cruiser styling, often with more refined engineering and potentially better fuel efficiency and reliability for less initial cost on the used market, though lacking the Harley mystique.
* Later Models: If seeking more modern features and improved reliability within the Harley-Davidson family, a later model Softail like a Fat Boy from the late 1990s or early 2000s would be a consideration, offering fuel injection and other enhancements.
Performance: In terms of raw acceleration and top-end speed, the FLSTF was not a performance leader. Its V-twin offered strong, satisfying torque for cruising, but rivals like some Japanese cruisers from Yamaha (e.g., V-Star series) or Honda (e.g., Shadow series) might offer smoother power delivery and slightly quicker 0-60 times. Harley's iconic rumble and character, however, are unmatched.
Features: The FLSTF was intentionally minimalist, focusing on its iconic styling. Competitors, especially later Japanese models, began offering more creature comforts like basic infotainment, cruise control, and more advanced braking systems. Harley's appeal was its authentic, stripped-down experience.
Reliability: Harley-Davidson V-twin engines from this era, especially the Evolution, are known for their durability when properly maintained. However, they often require more frequent and specialized maintenance than their Japanese counterparts. Some Japanese brands like Honda historically boasted superior reliability with less frequent maintenance needs.
Price: New, the Fat Boy was a premium offering. Today, used prices for a 1991 FLSTF are often in a similar or higher bracket compared to similarly aged Japanese cruisers, reflecting its iconic status and collector appeal.
Alternatives:
* Similar: The **Harley-Davidson FLHS Electra Glide Sport** (if a bagger style is preferred) or **FLHTC Electra Glide Classic** offer more touring amenities but share the same engine platform. Other Harley-Davidson Softail models from the era offer a similar ride feel.
* Different Style, Similar Era: A **1991 Honda Shadow VT1100C** or a **Yamaha XV1100 Virago** would offer comparable engine size and cruiser styling, often with more refined engineering and potentially better fuel efficiency and reliability for less initial cost on the used market, though lacking the Harley mystique.
* Later Models: If seeking more modern features and improved reliability within the Harley-Davidson family, a later model Softail like a Fat Boy from the late 1990s or early 2000s would be a consideration, offering fuel injection and other enhancements.
Final Verdict: Is the 1991 Harley-Davidson FLSTF a Good Motorcycle?
The 1991 Harley-Davidson FLSTF Fat Boy is ideal for the rider who cherishes classic American motorcycle styling, the distinctive V-twin rumble, and the iconic Harley-Davidson experience. It's best suited for those who appreciate a laid-back cruising style over outright performance or cutting-edge technology.
It is absolutely worth buying for the right enthusiast, particularly in the used market. As a collectible, its value is stable, and well-maintained examples offer a unique blend of nostalgia and riding enjoyment.
Conditions for purchase: Focus on used examples. Thorough mechanical inspection is crucial due to age. Prioritize bikes with a documented maintenance history and as much originality as possible. Specific trims are less of a factor for the FLSTF itself, as it is the quintessential Fat Boy. Be prepared for ongoing maintenance costs associated with a vintage motorcycle. It's a purchase for the heart, not necessarily for the wallet.
It is absolutely worth buying for the right enthusiast, particularly in the used market. As a collectible, its value is stable, and well-maintained examples offer a unique blend of nostalgia and riding enjoyment.
Conditions for purchase: Focus on used examples. Thorough mechanical inspection is crucial due to age. Prioritize bikes with a documented maintenance history and as much originality as possible. Specific trims are less of a factor for the FLSTF itself, as it is the quintessential Fat Boy. Be prepared for ongoing maintenance costs associated with a vintage motorcycle. It's a purchase for the heart, not necessarily for the wallet.
Simon A
Simon is a contributor to VinCheck, where he provides articles and reviews on various automotive topics. His work focuses on delivering accurate and up-to-date information about used cars, helping readers make informed decisions.