Katerina Swanson
The Honda CB750 is a classic motorcycle with a variety of fuel tank options available. The bike has been in production since 1969, and over the years, there have been different models and variations of the CB750, including the CB750K and the CB750 Super Sport. Finding a replacement fuel tank for the Honda CB750 that is not an OEM part can be challenging, and modifications may be necessary to ensure a proper fit. Aftermarket fuel tanks are available, but they may require custom fabrication to fit the bike. Additionally, some owners choose to create their own fuel tanks using sheet metal or fiberglass, although this requires time and expertise.
| Characteristics | Values |
|---|---|
| Types of Tanks | K and F |
| Tank Interchangeability | K tanks fit on F frames |
| Tank Compatibility | Honda CB750K SOHC models from 1969-1976 |
| Tank Material | Fiberglass, Steel |
| Tank Capacity | 3.8 gallons, 5.3 gallons |
| Tank Modifications | Modification of seat, rear lights, mudguard, and license plate support |
| Tank Installation | Rubber straps, rubber dampers, rubber pads, welding |
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What You'll Learn
The challenge of finding a replacement CB750 fuel tank
Finding a replacement fuel tank for a Honda CB750 motorcycle can be challenging, especially if you're looking for a specific model year or style. While there are options available, they may require some creativity, adaptation, and fabrication to get the desired result.
One option is to search for original equipment manufacturer (OEM) tanks, which are often considered the most reliable and accurate fit for the bike. However, these can be difficult to find and are typically quite expensive. Online searches may yield some results, but they are not always readily available.
Another possibility is to explore aftermarket alternatives. Some companies produce aftermarket fuel tanks for dirt bikes, dual-sports, custom bikes, and Harley-Davidsons. However, finding an aftermarket tank that specifically fits the CB750 may be a rarity. Generic off-the-shelf options may be available, but they would likely require modifications to make them work.
Custom fabrication is another route that some builders take. This involves using a SOHC tank or a similar period tank from another Japanese motorcycle and making the necessary adjustments to fit the CB750. This approach requires fabrication skills and creativity but can result in a unique and functional solution.
For those with the patience and willingness to learn, it is even possible to form sheet metal at home using typical woodworking tools, lumber, and hammers. This method, as demonstrated by master sheet metal worker Ron Covell on YouTube, allows for the creation of custom fuel tanks, albeit with a significant time investment.
Lastly, some owners opt for larger-capacity tanks, such as the 1981 CM400E, which offers a capacity of 3.8 gallons. This option may require modifications to the seat and frame to accommodate the larger tank.
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$9.26 $9.86
The F tank and K frame combination
When considering the F tank and K frame combination, it is advisable to opt for a new tank rather than a second-hand one. Used tanks often require significant work to smooth out rust and dents, which can be costly and time-consuming. New tanks, such as those offered by Carpy's Cafe Racers, are primed and ready for painting, saving restorers and custom builders time and frustration. These new tanks are also free from rust and tank sealers, ensuring a smooth and clean finish.
For those on a budget, a second-hand F tank can be an option, but it may require additional work to get it into optimal condition. Welding skills and access to a welder are beneficial when working with used tanks, as leaks are a significant concern. Whether opting for a new or used F tank, ensuring compatibility with the K frame and addressing any necessary modifications is crucial for a safe and functional motorcycle.
In conclusion, the F tank and K frame combination is a popular choice for Honda CB750 enthusiasts seeking a unique look and larger fuel capacity. While this combination requires modifications, it offers a distinct style and functionality. When considering this combination, it is important to weigh the benefits of a new tank against the challenges of working with a used one, always prioritizing safety and functionality.
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The pros and cons of a new versus a second-hand CB750 fuel tank
The Honda CB750 has a large 15.2-litre fuel tank, which means you can ride farther and longer between fill-ups. There are two major types of CB750 tanks: K and F. The F tank is longer and will fit a K frame, but the mounts will not be in the right spot.
When deciding between a new or second-hand CB750 fuel tank, there are several pros and cons to consider.
New CB750 Fuel Tank
Pros:
- New tanks are clean and rust-free, unlike some second-hand tanks, which may have rust, dents, or creases.
- They are ready to paint and can be customized to your desired colour.
- They are a genuine-looking SOHC gas tank and are of awesome quality.
- They fit the same as the original and save you the time and frustration of modifying a second-hand tank.
Cons:
New tanks are not cheap.
Second-Hand CB750 Fuel Tank
Pros:
- Second-hand tanks can be cheaper, especially if you are on a budget.
- They can be modified to fit your bike, although this requires additional work and may not always be feasible.
Cons:
- Second-hand tanks may be beaten up, with rust, dents, or other issues, requiring you to spend extra money to get them smooth.
- They may not fit your bike perfectly and may require engineering modifications.
- There is a risk of leaks, especially if you need to weld or modify the tank.
In conclusion, a new CB750 fuel tank offers better quality, convenience, and customizability, but at a higher cost. Meanwhile, a second-hand tank can be more affordable but may require additional work and come with inherent risks and imperfections. Ultimately, the decision depends on your budget, desired bike specifications, and willingness to modify and customize your bike.
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Custom-making a CB750 fuel tank
Option 1: Aftermarket Tanks
Aftermarket fuel tanks are available, but they may require some adaptation to fit your CB750. These tanks are typically designed for dirt bikes, dual-sports, custom bikes, or Harley-Davidsons. They can be purchased off-the-shelf and then modified to fit your specific motorcycle. This option may be more feasible if you are comfortable with fabrication and have some experience in welding.
Option 2: SOHC Tank
Another popular option is to use a SOHC tank or a similar period tank from another Japanese motorcycle. This option usually requires some fabrication to make it fit properly. The SOHC tank uses a two-bolt petcock, which was common on models from 1969 to 1975.
Option 3: Custom-Made Tank
For those feeling adventurous, it is possible to custom-make an entire fuel tank from scratch. This option requires a significant amount of time, patience, and skill. Some people have used materials like fiberglass to create their own tanks, while others have formed sheet metal using typical woodworking tools, lumber, and hammers. There are online resources, such as YouTube videos, that can provide instructions and guidance for this challenging process.
Option 4: OEM Reproduction Tanks
While they can be expensive, reproduction OEM tanks are available for the CB750. These tanks are created using the original forms, dies, and machines, resulting in a high-quality product. However, the cost of the tooling investment is reflected in the price of these tanks.
Other Considerations
When modifying your CB750 fuel tank, it is important to consider the frame of your motorcycle. The backbone of the CB750 frame is wider than most, which may require modifications to the tunnel of the fuel tank for a proper fit. Additionally, the seat may need to be changed to accommodate a larger tank. Ensuring safety and proper fitment is crucial when custom-making a CB750 fuel tank.
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The cost of manufacturing metal motorcycle tanks
Generally, metal motorcycle tanks are made from materials such as steel, aluminium, or titanium. Each metal has its advantages and disadvantages in terms of weight, strength, and corrosion resistance, which can impact the manufacturing process and cost.
One of the critical aspects of manufacturing metal motorcycle tanks is ensuring that they are safe and free from leaks. This often involves welding, which can be a complex and skilled process, particularly when joining different metals or ensuring that the tank is sealed correctly. The cost of welding can vary depending on the equipment, the expertise of the welder, and the time required for the job.
Another factor influencing the cost of manufacturing is the volume of production. Producing a single custom tank or a small batch will typically incur higher costs per unit compared to mass production, as fixed costs such as tooling and setup are spread across a smaller number of units.
Additionally, the design of the tank can impact the manufacturing cost. Complex shapes or designs that require intricate welding or specialised coatings will generally be more expensive to produce.
In terms of specific examples, the Honda CB750 gas tank is a popular option for motorcycle enthusiasts. Restoring or replacing the gas tank on this model can vary in cost depending on the approach taken. Some opt for second-hand or vintage tanks, which may require significant work to remove rust and smooth out dents, adding to the overall cost. Others choose to purchase brand new tanks, which can be more expensive upfront but save on the time and effort of restoration, ensuring a smoother finish and better performance.
Overall, the cost of manufacturing metal motorcycle tanks can vary widely depending on the specific circumstances and requirements. It is important to consider the various factors involved to determine the final price.
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Frequently asked questions
There are two major types of CB750 fuel tanks: K and F. The F tank is longer and will fit a K frame, but the mounts will not be in the right spot.
You can buy a CB750 fuel tank from various online retailers, including Carpy's Cafe Racers, Officine08, and eBay.
It is important to consider the year and model of your CB750 when purchasing a fuel tank, as different tanks may fit differently on certain models. Additionally, some tanks may require modifications to other parts of the motorcycle, such as the seat or frame.
Yes, some people choose to fabricate their own fuel tanks or modify existing ones to fit their CB750. This can be done using sheet metal and typical woodworking tools, or by adapting a tank from another motorcycle.
