Rajan Wilcox
When it comes to the Honda CB350, ensuring the correct fuel line size is essential for optimal performance and safety. The fuel line is responsible for delivering fuel from the tank to the engine, and using the wrong size can lead to leaks, restricted fuel flow, or even engine damage. While the specific fuel line size for the CB350 is not readily available, general recommendations and repair advice for Honda motorcycles with similar engines can provide valuable insights for owners seeking to maintain their bikes.
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What You'll Learn
A 1/4 fuel line is too large for a CB350
A 1/4" fuel line is too large for a CB350. The stock size fuel line for the Honda CB350K is 5.5mm, which is significantly smaller than 1/4" (6.35mm).
While some sources suggest that a 1/4" fuel line can work for a Honda motorcycle, this is not recommended for the CB350. A 1/4" fuel line will be too large and will not fit properly, even with a good clamp. A 6mm fuel line will also be a loose fit and is not recommended.
The best option for a fuel line for a CB350 is a 5.5mm fuel line, which is the stock size for this model. This size will ensure a proper fit and prevent leaks. It is important to use the correct size fuel line to avoid any issues with fuel flow or leaks.
Additionally, it is worth noting that the fuel line should be made of the correct material. It is recommended to use a fuel line specifically designed for motorcycles, as other types of hoses, such as PVC or vacuum hoses, can harden quickly and cause issues.
Furthermore, it is important to consider the condition of the fuel tank and fuel lines. If the tank is rusty or clogged, it may need to be cleaned or replaced. Regular maintenance and inspections can help prevent issues with the fuel system and ensure the bike runs smoothly.
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6mm will be a loose fit but works with a clamp
When it comes to the fuel line size for a CB350, specifically the 1971 CL350, there are a few options to consider. The bore diameter, or inner diameter, of the fuel line is important to ensure a proper fit and function. While 5.5mm is the specified bore diameter, some have found that 1/4 inch or 6mm fuel lines can also work.
Using a 6mm fuel line for your CB350 will be a slightly loose fit. However, it can still be secured with a good clamp. While it may not be a perfect fit, it is a workable solution. It is important to note that other options, such as a 1/4-inch fuel line, may be too large, so a slightly smaller size like 6mm with a clamp is a viable option.
Clamps are essential when using a fuel line that is slightly larger than the specified size. This ensures a secure connection and prevents leaks. Without clamps, there is a risk of fuel leakage, which can be dangerous. Therefore, if you choose to use a 6mm fuel line for your CB350, be sure to use high-quality clamps designed for fuel lines.
There are different types of clamps available, such as spring clamps or hose clamps, that can be used with a 6mm fuel line. It is recommended to consult with a trusted mechanic or refer to the manufacturer's guidelines to ensure the correct type of clamp is used. Proper installation and periodic inspections are crucial to maintain the safety and performance of your CB350's fuel system.
While a 6mm fuel line with a clamp can work for your CB350, it is always advisable to seek professional advice or refer to the specific recommendations for your motorcycle model. Ensuring the correct fuel line size and secure connections is essential for the safe and efficient operation of your vehicle.
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3/16 fuel hose fits tightly and may need lubrication
The Honda CB350 is a classic motorcycle that was first introduced in the 1960s and has since become a popular choice for custom bike builders and restorers. When it comes to the fuel line for a CB350, it's important to ensure that you're using the correct size to avoid any leaks or issues with fuel delivery.
One common question that arises is whether a 3/16 fuel hose is the appropriate size for the CB350. This size fuel hose is known to fit tightly over the fuel nozzles on the petcock and the inputs on the stock Keihin carburetors. In fact, it can fit so tightly that some lubrication may be required to ease the installation process.
There are a variety of lubricants that can be used in this situation. Some people recommend using a light coating of oil, such as 10 wt oil, to help the hose slide into place more easily. Others have suggested using products specifically designed for this purpose, such as United-Erie "EZ Turn Fuel Lube" or Earls hose lubricant. These options can provide a persistent layer of lubrication that will make future hose removal easier.
However, it's important to note that some lubricants, such as dish soap, can dry and form a sticky film, which may not be ideal. Additionally, while Vaseline or motor oil may be considered, there are concerns about their potential impact on catalytic converters or fuel injectors. As such, it's always a good idea to consult with a mechanic or a specialist before choosing a lubricant to ensure that it is safe and suitable for your specific application.
In summary, while a 3/16 fuel hose may fit tightly on a CB350, a small amount of lubrication can make the installation process smoother. It's important to select an appropriate lubricant that will not cause damage to the fuel system or require frequent reapplication. With the right approach, you can ensure a secure and leak-free fuel line connection on your CB350.
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No clamps are needed for a 3/16 hose
For a 1971 Honda CL350, a fuel hose with a 5.5mm bore diameter is recommended. A 1/4" hose should also be suitable, but a 3/16" hose will be a tighter fit.
If you opt for a 3/16" hose, no clamps are needed for a 3/16 hose. The 3/16" hose fits very tightly over the fuel nozzles on the petcock and the inputs on the stock Keihin carburetors. In fact, the hose fits so tightly that you will need to lubricate the end with a little bit of oil to get it on.
Hose clamps are typically used to secure a hose over a fitting, such as a spigot or barb, acting as a seal to prevent fluid from leaking at the connection. They are also used to stabilize the hose connection. However, in the case of a 3/16" hose for a Honda CL350, the tight fit renders clamps unnecessary.
It is worth noting that some sources recommend using clamps with a 3/16" hose. For example, one source mentions using a regular worm drive hose clamp, which can be tightened with a screwdriver or torque wrench. Miniature worm drive hose clamps are also available, typically featuring a 1/4" slotted hex head screw. However, given the specific context of a 3/16" hose for a Honda CL350, the tight fit renders clamps unnecessary.
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For a 1971 CL350, a fuel hose with a 5.5mm bore diameter should work. A 1/4" hose will also work, but you will need clamps. A 6mm hose will be a loose fit, but it will also work with a good clamp.
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Frequently asked questions
A 1/4-inch fuel hose should be fine for your Honda CB350. You can also use a 3/16-inch fuel hose, but it will fit very tightly and you may need to lube the end with oil.
Yes, a 6mm fuel hose will work, but it will be a loose fit and you will need a good clamp.
You should use a fuel line specifically designed for fuel and not something else like PVC or vacuum hose, which will harden quickly.
