The 2008 Big Dog K9 is a quintessential factory-built American custom chopper, emerging from the era when Big Dog Motorcycles was a prominent player in the custom bike market. This long, low, and raked-out cruiser features a distinctive body style, known for its exaggerated dimensions and massive rear tire. Produced primarily in the mid-2000s, the K9 was a flagship model. While "trims" in the traditional sense don't apply, each K9 was highly customizable, with new prices often starting around $30,000 to $35,000+. Its popularity stemmed from offering a radical custom look straight from the factory, making it stand out from mainstream cruisers with its aggressive stance and powerful S&S V-twin engine.
The Good
The 2008 Big Dog K9 offers stunning, head-turning custom chopper aesthetics and the raw, unadulterated power of its large S&S V-twin engine, appealing deeply to emotional buyers seeking uniqueness and presence. For practical aspects, the S&S engine is renowned for its durability, and despite its custom nature, the K9 provides a surprisingly comfortable ride for its class, making long cruises enjoyable. Its unique design ensures excellent value for those seeking a distinct, factory-built custom motorcycle.
The Bad
Known weaknesses for the 2008 Big Dog K9 include its challenging low-speed maneuverability due to the long wheelbase and rake, limited lean angle, and substantial weight. Electrical issues, such as wiring harness problems or stator failures, can arise. Parts for specific custom components can be expensive and sometimes difficult to source due to the brand's niche status, and the dealer network is very limited compared to major manufacturers.
2008 Big Dog K9: Quick Overview
- Engine Options: The 2008 Big Dog K9 primarily featured a potent S&S X-Wedge 117 cubic inch (1917cc) V-twin engine, a signature component renowned for its torque and reliability. This large displacement engine provides ample power for highway cruising and assertive acceleration. Big Dog occasionally offered other S&S engine sizes in different models, but the K9 largely standardized on the 117ci for its power-to-weight ratio and distinct exhaust note.
- Horsepower: While exact figures vary slightly based on tuning and exhaust, the S&S 117ci engine typically produced around 90-100 horsepower at the crank, accompanied by a significant amount of torque, often exceeding 110-120 ft-lbs. This power output ensures robust performance for a cruiser of its size.
- Fuel Economy: Fuel economy is not a strong suit for a high-performance, large-displacement V-twin engine. Owners typically report figures in the low to mid-30s miles per gallon (mpg), depending heavily on riding style and tuning. Premium fuel is usually recommended or required to ensure optimal engine performance and longevity.
- 0-60 Times: Official 0-60 mph times were not typically published by Big Dog Motorcycles. However, given its powerful S&S engine and relatively low center of gravity, estimates place its 0-60 mph acceleration in the low 4-second range, making it quite quick for a cruiser, especially in a straight line.
- Towing Capacity: Towing capacity is not applicable for the Big Dog K9. It is designed as a solo or two-up riding motorcycle and is not equipped or intended for towing.
- Trim-Level Features: The K9 itself was a distinct model, rather than having multiple "trims." Its defining features included a massive 300-series rear tire, a very long wheelbase (often exceeding 100 inches), and a highly raked front end for its aggressive chopper stance. Standard features comprised polished billet aluminum components, a Baker 6-speed right-side drive transmission, a comfortable two-up seat (for a chopper), custom paint schemes (often multi-layered and intricate), digital instrumentation, and high-quality chrome finishes throughout. Owners could extensively customize their K9s from the factory, choosing from various paint, wheel, exhaust, and accessory options, effectively making each bike unique.
2008 Big Dog K9 Specifications
Vehicle Information
| Year | 2008 |
| Make | Big Dog |
| Model | K9 |
| Trim | - |
| Style | - |
| Type | Motorcycle |
| Category | Motorcycle |
Manufacturing Details
| Made In | United States |
| Manufacturing City | WICHITA |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | ss 119 c.i. V-twin |
| Engine Size | - |
| Engine Cylinders | - |
| Transmission | 6-Speed |
| Transmission Type | - |
| Transmission Speeds | 6-Speed |
| Drivetrain | - |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
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What Problems Does the 2008 Big Dog K9 Have?
The 2008 Big Dog K9, while admired for its custom appeal, is not without its frequently reported problems and long-term reliability concerns, common with many niche, factory-custom motorcycles. One of the most often cited issues revolves around the electrical system. Owners frequently report problems such as intermittent wiring harness glitches, stator failures, or voltage regulator issues leading to battery drain or charging system malfunctions. These can be challenging to diagnose and repair due to the custom wiring looms.
Another area of concern can be the fuel delivery system. While 2008 models largely transitioned to Electronic Fuel Injection (EFI), older carburetors (if any were still in use for certain configurations) and early EFI systems sometimes suffered from finicky tuning, rough idling, or fuel pump issues. Even with EFI, proper tuning is critical for optimal performance and can be a source of frustration if not correctly set up.
Oil leaks, particularly from the primary drive or engine gaskets, are not uncommon on large V-twin engines of this era, and Big Dogs are no exception. Regular inspection and timely gasket replacement are often necessary.
From a handling perspective, the K9's extreme rake and long wheelbase, while contributing to its iconic look, can lead to instability at very low speeds and a severely limited lean angle, making tight turns and U-turns a challenge. This isn't a "problem" in the traditional sense, but a design characteristic that some riders find problematic.
The sheer power and weight, combined with the massive rear tire, can lead to accelerated tire wear, especially on the rear. Replacing custom-sized tires can be more expensive than standard motorcycle tires. Furthermore, while the brakes are generally adequate, the bike's substantial weight can sometimes make them feel less responsive than on lighter, more agile motorcycles.
Regarding recalls, Big Dog Motorcycles, being a smaller manufacturer, had fewer widely publicized recalls compared to industry giants. It's always advisable to check the NHTSA database using the VIN for any specific recalls that might have affected the 2008 K9. Long-term reliability of the S&S engine itself is generally high, but the custom chassis components, paint, and chrome require diligent maintenance to prevent degradation over time, such as chrome pitting or paint fading. Finding mechanics familiar with Big Dog motorcycles for major repairs can also be a challenge outside of specialized custom shops.
Another area of concern can be the fuel delivery system. While 2008 models largely transitioned to Electronic Fuel Injection (EFI), older carburetors (if any were still in use for certain configurations) and early EFI systems sometimes suffered from finicky tuning, rough idling, or fuel pump issues. Even with EFI, proper tuning is critical for optimal performance and can be a source of frustration if not correctly set up.
Oil leaks, particularly from the primary drive or engine gaskets, are not uncommon on large V-twin engines of this era, and Big Dogs are no exception. Regular inspection and timely gasket replacement are often necessary.
From a handling perspective, the K9's extreme rake and long wheelbase, while contributing to its iconic look, can lead to instability at very low speeds and a severely limited lean angle, making tight turns and U-turns a challenge. This isn't a "problem" in the traditional sense, but a design characteristic that some riders find problematic.
The sheer power and weight, combined with the massive rear tire, can lead to accelerated tire wear, especially on the rear. Replacing custom-sized tires can be more expensive than standard motorcycle tires. Furthermore, while the brakes are generally adequate, the bike's substantial weight can sometimes make them feel less responsive than on lighter, more agile motorcycles.
Regarding recalls, Big Dog Motorcycles, being a smaller manufacturer, had fewer widely publicized recalls compared to industry giants. It's always advisable to check the NHTSA database using the VIN for any specific recalls that might have affected the 2008 K9. Long-term reliability of the S&S engine itself is generally high, but the custom chassis components, paint, and chrome require diligent maintenance to prevent degradation over time, such as chrome pitting or paint fading. Finding mechanics familiar with Big Dog motorcycles for major repairs can also be a challenge outside of specialized custom shops.
How long will the 2008 Big Dog K9 last?
The 2008 Big Dog K9, with its robust S&S engine, is built for long-term service. With meticulous maintenance, these engines can easily achieve 50,000 to 100,000 miles. However, most K9s are weekend pleasure bikes, so average owner mileage is often much lower, typically ranging from 1,000 to 3,000 miles per year. Many well-cared-for examples from 2008 are still on the road today, representing over 15 years of service.
Long-term durability is strong for the core components like the frame and engine. However, weaknesses tend to emerge in the electrical system, where original wiring and connectors can degrade, leading to intermittent issues. Rubber components such as hoses and gaskets will require replacement over time due to age and heat cycling. Chrome finishes, if not properly cared for, can pit or peel, and custom paintwork can fade or chip. The availability of proprietary custom parts can become a long-term challenge, although S&S engine components are readily available. Consistent maintenance is paramount to mitigating these age-related weaknesses.
Long-term durability is strong for the core components like the frame and engine. However, weaknesses tend to emerge in the electrical system, where original wiring and connectors can degrade, leading to intermittent issues. Rubber components such as hoses and gaskets will require replacement over time due to age and heat cycling. Chrome finishes, if not properly cared for, can pit or peel, and custom paintwork can fade or chip. The availability of proprietary custom parts can become a long-term challenge, although S&S engine components are readily available. Consistent maintenance is paramount to mitigating these age-related weaknesses.
What Technology & Safety Features are Included?
The 2008 Big Dog K9, as a factory-built custom chopper, prioritized raw riding experience and aesthetics over advanced technology and intricate features. Therefore, its built-in tech is quite spartan by modern standards.
Built-in Tech: The primary technological features were limited to essential instrumentation. This typically included a digital speedometer and odometer, along with basic warning lights for oil pressure, neutral, and high beam. Some models might have included a small clock or trip meter functionality. There was no integrated navigation system, complex multi-information display, or connectivity features like Bluetooth.
Entertainment: There were no built-in entertainment features. Owners seeking audio typically relied on aftermarket solutions, such as handlebar-mounted speakers or personal communication devices with headphones, rather than any factory-installed stereo.
Driver-Assistance Features: The 2008 K9 lacked any form of modern driver-assistance technology. Features like ABS (Anti-lock Braking System), traction control, stability control, cruise control, or advanced ride modes were not available. The riding experience was purely mechanical and rider-controlled.
Safety Features: Basic safety equipment included adequate lighting with a powerful headlight, taillight, and turn signals. Braking was handled by dual disc brakes on the front wheel and a single disc on the rear, providing sufficient stopping power for its class. However, as mentioned, there was no ABS. The long wheelbase and low stance contributed to straight-line stability, but its extreme rake and limited lean angle could be a safety consideration in spirited cornering or emergency maneuvers. There are no crash-test ratings available for motorcycles of this niche segment from organizations like NHTSA or IIHS, as these tests are typically not conducted for low-volume, custom bikes.
Optional Features: While "optional features" in the traditional sense were limited, Big Dog Motorcycles excelled in factory customization. Owners could select from a vast array of custom paint schemes, chrome packages, wheel designs, exhaust systems, handlebar styles, and seating options. This level of personalization was a significant selling point, allowing each K9 to be uniquely tailored to the owner's taste, effectively making the customization itself a core "feature." Aftermarket support also provided extensive options for further personalization and performance upgrades.
Built-in Tech: The primary technological features were limited to essential instrumentation. This typically included a digital speedometer and odometer, along with basic warning lights for oil pressure, neutral, and high beam. Some models might have included a small clock or trip meter functionality. There was no integrated navigation system, complex multi-information display, or connectivity features like Bluetooth.
Entertainment: There were no built-in entertainment features. Owners seeking audio typically relied on aftermarket solutions, such as handlebar-mounted speakers or personal communication devices with headphones, rather than any factory-installed stereo.
Driver-Assistance Features: The 2008 K9 lacked any form of modern driver-assistance technology. Features like ABS (Anti-lock Braking System), traction control, stability control, cruise control, or advanced ride modes were not available. The riding experience was purely mechanical and rider-controlled.
Safety Features: Basic safety equipment included adequate lighting with a powerful headlight, taillight, and turn signals. Braking was handled by dual disc brakes on the front wheel and a single disc on the rear, providing sufficient stopping power for its class. However, as mentioned, there was no ABS. The long wheelbase and low stance contributed to straight-line stability, but its extreme rake and limited lean angle could be a safety consideration in spirited cornering or emergency maneuvers. There are no crash-test ratings available for motorcycles of this niche segment from organizations like NHTSA or IIHS, as these tests are typically not conducted for low-volume, custom bikes.
Optional Features: While "optional features" in the traditional sense were limited, Big Dog Motorcycles excelled in factory customization. Owners could select from a vast array of custom paint schemes, chrome packages, wheel designs, exhaust systems, handlebar styles, and seating options. This level of personalization was a significant selling point, allowing each K9 to be uniquely tailored to the owner's taste, effectively making the customization itself a core "feature." Aftermarket support also provided extensive options for further personalization and performance upgrades.
What Colors Options are Available?
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In the meantime, feel free to explore the other sections for more content.
In the meantime, feel free to explore the other sections for more content.
2008 Big Dog K9 Prices and Market Value
When new in 2008, a Big Dog K9 carried a premium price tag, typically ranging from $30,000 to over $35,000, depending on customization options. As a factory-built custom, it commanded prices comparable to or exceeding many top-tier mainstream cruisers.
Today, in the used market, prices are highly variable but generally range from $10,000 to $20,000+, with exceptional, low-mileage examples sometimes fetching more. Depreciation was significant from its new price, typical for most motorcycles. However, for a niche custom bike, the K9 has maintained a reasonable percentage of its value after the initial depreciation compared to standard production models, especially for a well-preserved example. Factors affecting resale value include the bike's overall condition, mileage, quality of custom paint and chrome, documented maintenance history, and the specific desirability of its factory options. Bikes with tasteful, high-quality modifications tend to hold value better than those with questionable aftermarket additions. The health of the S&S engine and electrical system is also a critical factor for potential buyers.
Today, in the used market, prices are highly variable but generally range from $10,000 to $20,000+, with exceptional, low-mileage examples sometimes fetching more. Depreciation was significant from its new price, typical for most motorcycles. However, for a niche custom bike, the K9 has maintained a reasonable percentage of its value after the initial depreciation compared to standard production models, especially for a well-preserved example. Factors affecting resale value include the bike's overall condition, mileage, quality of custom paint and chrome, documented maintenance history, and the specific desirability of its factory options. Bikes with tasteful, high-quality modifications tend to hold value better than those with questionable aftermarket additions. The health of the S&S engine and electrical system is also a critical factor for potential buyers.
2008 Big Dog K9 Cost of Ownership
Owning a 2008 Big Dog K9 is generally a costly endeavor. Insurance can be higher than average due to its custom status, high original value, and perceived theft risk, though rates vary by rider. Fuel economy is poor, with the large S&S engine consuming premium fuel at low to mid-30s MPG. Maintenance costs are elevated because specialized parts and labor rates for custom bikes are often higher. Repair can be expensive and challenging; finding mechanics familiar with Big Dog motorcycles and sourcing proprietary custom parts can be difficult. Long-term ownership involves potential costs for aging electrical components, tire replacements (especially the wide rear tire), and chrome/paint upkeep. In summary, the 2008 Big Dog K9 is not an economical vehicle; it's a luxury item with correspondingly high ownership costs.
2008 Big Dog K9 Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
2008 Big Dog K9 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
2008 Big Dog K9 Insurance
Insurance for a 2008 Big Dog K9 is moderately priced, reflecting its status as a Motorcycle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2008 Big Dog K9 Compare to Other Motorcycle?
The 2008 Big Dog K9 carved its niche among factory-built custom choppers, making direct comparisons to mainstream cruisers complex. Its primary rivals would include other factory custom brands like American IronHorse (e.g., Texas Chopper, Tejas) or Bourget, and perhaps the more custom-oriented models from Harley-Davidson's CVO (Custom Vehicle Operations) line.
In terms of performance, the K9, with its S&S 117ci engine, offers raw, unadulterated V-twin power and impressive straight-line acceleration, often surpassing similarly sized Harley-Davidson production bikes of its era. However, its extreme rake, long wheelbase, and limited lean angle mean it sacrifices agility and handling prowess compared to most mainstream cruisers, even custom ones like a Harley-Davidson Softail Custom or a Victory Hammer. The K9 is built for cruising and making a statement, not for carving corners.
Features are where the K9 fundamentally differs. Its main "feature" is its bespoke, radical custom styling – the massive rear tire, extended front end, and intricate paintwork. In contrast, mainstream rivals, especially CVO Harleys, might offer more rider-friendly amenities, integrated infotainment (in later years), ABS, or superior ergonomics for varied riding conditions. The K9 is minimalistic in its tech.
Reliability is a mixed bag. The S&S engine at its core is renowned for durability. However, the custom nature of the K9's chassis, wiring, and proprietary components can lead to more frequent small electrical issues or harder-to-find replacement parts compared to a mass-produced Harley-Davidson, which benefits from a vast dealer network and parts availability. American IronHorse bikes shared similar reliability profiles.
Price new, the K9 was comparable to or sometimes more expensive than a CVO Harley-Davidson. Used, its value is highly dependent on condition and customization, generally holding better than a standard production cruiser but with a more volatile market.
Alternatives:
Ultimately, the K9 is for someone who prioritizes ultimate custom style and presence above all else. For a more balanced, all-around reliable cruiser with custom flair and better support, a customized Harley-Davidson is often a more practical, "better" alternative.
In terms of performance, the K9, with its S&S 117ci engine, offers raw, unadulterated V-twin power and impressive straight-line acceleration, often surpassing similarly sized Harley-Davidson production bikes of its era. However, its extreme rake, long wheelbase, and limited lean angle mean it sacrifices agility and handling prowess compared to most mainstream cruisers, even custom ones like a Harley-Davidson Softail Custom or a Victory Hammer. The K9 is built for cruising and making a statement, not for carving corners.
Features are where the K9 fundamentally differs. Its main "feature" is its bespoke, radical custom styling – the massive rear tire, extended front end, and intricate paintwork. In contrast, mainstream rivals, especially CVO Harleys, might offer more rider-friendly amenities, integrated infotainment (in later years), ABS, or superior ergonomics for varied riding conditions. The K9 is minimalistic in its tech.
Reliability is a mixed bag. The S&S engine at its core is renowned for durability. However, the custom nature of the K9's chassis, wiring, and proprietary components can lead to more frequent small electrical issues or harder-to-find replacement parts compared to a mass-produced Harley-Davidson, which benefits from a vast dealer network and parts availability. American IronHorse bikes shared similar reliability profiles.
Price new, the K9 was comparable to or sometimes more expensive than a CVO Harley-Davidson. Used, its value is highly dependent on condition and customization, generally holding better than a standard production cruiser but with a more volatile market.
Alternatives:
- Similar Niche: For those wanting a factory custom chopper, the American IronHorse Texas Chopper or Tejas would be direct conceptual rivals, offering similar aesthetics and riding experiences, though both brands are now defunct.
- Mainstream with Custom Potential: A highly customized Harley-Davidson Softail Breakout or Fat Boy could offer a factory-supported bike with a strong custom aesthetic, better reliability, and superior dealer network, albeit with a less extreme "chopper" stance.
- Performance Cruiser: If performance and handling (for a cruiser) are priorities, the now-defunct Victory Hammer S offered a powerful, stylish alternative with better handling characteristics than the K9.
Ultimately, the K9 is for someone who prioritizes ultimate custom style and presence above all else. For a more balanced, all-around reliable cruiser with custom flair and better support, a customized Harley-Davidson is often a more practical, "better" alternative.
Final Verdict: Is the 2008 Big Dog K9 a Good Motorcycle?
The 2008 Big Dog K9 is an ideal motorcycle for a very specific type of rider: the enthusiast who craves an undeniable, factory-built custom chopper with massive road presence and the raw power of an S&S V-twin. It's for someone who prioritizes unique styling and the experiential aspect of riding over practicality, nimble handling, or low ownership costs. This bike is a statement piece, designed to turn heads and deliver an unfiltered, American-made riding experience.
Is it worth buying? Absolutely, for the right individual. It's not a "sensible" purchase for a daily commuter or a rider seeking a versatile machine, but rather an investment in a lifestyle and a piece of custom motorcycle history. As buying new is no longer an option, it must be purchased used.
When considering a used 2008 K9, look for well-maintained examples with documented service records. Pay close attention to the electrical system, overall engine health, and the condition of the chrome and paint. A pre-purchase inspection by a mechanic familiar with custom V-twins is highly recommended. Focus on bikes whose factory customization appeals to you directly, as extensive aftermarket modifications might not universally enhance value. Be prepared for potentially higher maintenance and repair costs, and understand that dealer support will be limited. It's a unique machine that delivers immense character, but demands a committed owner.
Is it worth buying? Absolutely, for the right individual. It's not a "sensible" purchase for a daily commuter or a rider seeking a versatile machine, but rather an investment in a lifestyle and a piece of custom motorcycle history. As buying new is no longer an option, it must be purchased used.
When considering a used 2008 K9, look for well-maintained examples with documented service records. Pay close attention to the electrical system, overall engine health, and the condition of the chrome and paint. A pre-purchase inspection by a mechanic familiar with custom V-twins is highly recommended. Focus on bikes whose factory customization appeals to you directly, as extensive aftermarket modifications might not universally enhance value. Be prepared for potentially higher maintenance and repair costs, and understand that dealer support will be limited. It's a unique machine that delivers immense character, but demands a committed owner.
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.