
Big Dog Motorcycles are custom-built bikes with Daytec frames. The fuel tank compatibility depends on the motorcycle model year. For instance, the 2005 model had a dual gas tank with a 250 back tire, while the 2006 model had a one-piece coffin-style gas tank. Softail custom gas tanks are also said to be mountable on Big Dog frames. Additionally, there are fuel tank options available on Amazon that are compatible with Big Dog Motorcycles.
Fuel Tanks Compatible with Big Dog Motorcycles
| Characteristics | Values |
|---|---|
| Year | 2005 Big Dog Motorcycles had dual gas tanks with a 250 back tire. |
| The 2006 model had a 1-piece coffin-style gas tank with a rotating piece to lock it onto the frame and a 250 tire. | |
| The 2005 and 2006 Mastiff models were the only ones with these swingarms. | |
| Interchangeable Parts | Softail custom gas tanks can be mounted onto the Big Dog frame. |
| Harley Davidson Softail hidden shocks (1984-1997) can be swapped. | |
| Gas Tank Fuel Valve | Compatible with Harley Dyna Fatboy Heritage Softail Springer Sport Glide Sportster 883 1000 Super Glide Low Rider. |
| Gas Tank Fuel Cap | Compatible with Harley Sportster XL 1200 883 48 Dyna Touring Road King. |
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What You'll Learn

Harley Davidson Softail gas tanks are compatible with Big Dog frames
Harley Davidson Softail gas tanks are compatible with Big Dog motorcycle frames. While the design of the gas tank may differ, the tanks can be mounted onto the Big Dog frame.
The compatibility of the Harley Davidson Softail gas tanks with Big Dog frames is an interesting feature that allows for customisation and flexibility in motorcycle building and maintenance. This compatibility is especially useful for those who own both a Harley Davidson Softail and a Big Dog motorcycle, as it provides the option to interchange parts between the two.
It is important to note that while the gas tanks are interchangeable, other parts of the motorcycle may not be. For example, the pivot shaft, bearings, and axle locks on a Softail model differ significantly from those on a Big Dog motorcycle. Additionally, the swingarms on Big Dog motorcycles are unique and not interchangeable with other brands.
The Harley Davidson Softail gas tanks that can be mounted onto Big Dog frames include those from the 1992, 1996, and 1997 Softail custom models. These gas tanks can be fitted to a variety of Big Dog frames, including those from the same era.
When considering the compatibility of Harley Davidson Softail gas tanks with Big Dog frames, it is essential to consult a professional or a trusted motorcycle mechanic. They can provide expert advice and ensure that any modifications or replacements are done safely and correctly.
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2005 Big Dog models had dual gas tanks
The 2005 Big Dog models had dual gas tanks with a 250 back tire. This is in contrast to the 2006 Big Dog models, which had a one-piece coffin-style gas tank that used a rotating piece to lock onto the frame and a 250 tire. The 2005 and 2006 Mastiff models were the only years that these swingarms were used with a 250 tire.
The gas tanks on the 2005 and 2006 models are not interchangeable. The 2005 model's dual gas tanks are exclusive to that year, and the same applies to the 2006 model's coffin-style gas tank. The gas tanks are one of the key differences between the 2005 and 2006 Big Dog models, and this affects the overall design and functionality of the motorcycles.
The dual gas tanks on the 2005 Big Dog models are also compatible with certain Harley-Davidson parts. The hidden shocks from a 1984 to 1997 Harley Davidson Softail can be swapped onto the 2005 Big Dog swingarms. Additionally, some gas tank caps designed for Harley-Davidson motorcycles are also compatible with the 2005 Big Dog dual gas tanks.
The 2005 Big Dog dual gas tanks are considered a unique feature and are sought after by some motorcycle enthusiasts. These tanks have a distinct design and are larger than the tanks found on many other motorcycles. The dual gas tanks also contribute to the overall style and aesthetic of the 2005 Big Dog models, which are known for their custom frames and attention to detail.
It's important to note that while the 2005 Big Dog models had dual gas tanks as a standard feature, there may be variations or custom modifications that exist. Some owners may have opted for different gas tank setups or made changes to their motorcycles over time. However, the dual gas tanks are a defining characteristic of the 2005 Big Dog models and are a key factor in their identification.
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2006 Big Dog models had a one-piece coffin-style gas tank
The 2006 Big Dog Mastiff model had a one-piece coffin-style gas tank, a notable difference from the dual gas tank of the 2005 model. This tank is secured to the frame with a unique rotating piece and has a 250 rear tire. The 2006 Mastiff model is also distinguished by its powerful S&S 117-inch powerplant, which provides ample power across various riding conditions.
The one-piece coffin-style gas tank is an iconic feature of the 2006 Big Dog Mastiff, contributing to its sleek and distinctive aesthetic. This tank style is a significant departure from the dual gas tank setup found on earlier models, marking a design evolution for Big Dog motorcycles.
The tank's locking mechanism is worth noting, as it employs a "weird" rotating piece, according to some owners. This mechanism locks the tank securely to the frame, showcasing Big Dog's attention to detail and innovation in motorcycle engineering.
The 2006 Big Dog Mastiff's one-piece coffin-style gas tank also complements the bike's overall design. With its long, flowing lines, the tank adds to the motorcycle's visual appeal, making it stand out on the road. This tank style also contributes to the bike's overall balance and handling, as Big Dog motorcycles are known for their stable and confident riding experience.
While the 2006 Big Dog Mastiff is specifically mentioned for its one-piece coffin-style gas tank, it is unclear if other 2006 Big Dog models, such as the K9, utilised a similar tank design. The K9 model from that year is noted for having a 300 rear tire, a difference from the Mastiff's 250 tire. However, no explicit mention of the K9's gas tank configuration has been found in these sources.
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Big Dog fuel tank caps are available on Amazon
In addition to the fuel tank caps, Amazon also offers a Big Dog Gas Cap Paint Saver Installation and Removal Tool, which is compatible with all Big Dog models from 1999 to 2011.
It is worth noting that the fuel tank designs for Big Dog motorcycles varied between 2005 and 2006. While the 2005 model had a dual gas tank, the 2006 model featured a one-piece coffin-style gas tank.
If you are looking for a fuel tank cap for a Big Dog motorcycle, Amazon offers a range of options specifically designed for these bikes, ensuring a proper fit and functionality.
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Aftermarket fuel tank options are available for Big Dog motorcycles
It is possible to install Harley-compatible fuel tanks on Big Dog motorcycles, but modifications to the trans mount on the frame are necessary. Additionally, Softail custom gas tanks are believed to be mountable on Big Dog frames, although the design differs.
Big Dog Motorcycles offers a range of OEM fuel valves and gas caps for their motorcycles. The OEM fuel valves are available in chrome for models from 2000 to 2011, while the gas caps are designed for split tank models from 1999 to 2005 and are also chrome-plated.
There are also aftermarket fuel tanks available from other manufacturers, such as HCmotorku. Their 14.4L/3.8-gallon fuel tank is designed for Harley Sportster XL883N 72 1200 X48 models from 2007 to 2022. This tank is made from 1.5mm tensile steel and requires painting before use.
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Frequently asked questions
Fuel tanks from a Harley Davidson Softail model will mount onto a Big Dog frame. Tanks from a 1984-1997 Harley Davidson Softail are also compatible with Big Dog swingarms.
The 2005 model had a dual gas tank with a 250 back tire. The 2006 model had a one-piece coffin-style gas tank that used a rotating piece to lock onto the frame.
Yes, Big Dog Motorcycles offers a gas cap set for all models with dual tanks from 1999-2005.
Yes, the HCmotorku Motorcycle 14.4L/ 3.8-gallon gas fuel tank is compatible with Big Dog Motorcycles without needing any modifications.










































