Rajan Wilcox
The Honda Trail CT90 is a motorcycle that has been in production since the 1960s. The bike has two fuel lines, a main line, and a reserve line. The original Honda fuel lines could be differentiated by touch, with the main line being plain and the reserve having ribs. However, this line is no longer available. In more recent models, the main and reserve lines are marked on the rear of the fuel inlet bosses of the carb, with 'O' for the main line and 'R' for the reserve line.
| Characteristics | Values |
|---|---|
| Number of fuel lines | 2 |
| Main fuel line | Left side of the tank |
| Reserve fuel line | Right side of the tank |
| Original fuel line size | 5.5mm |
| Fuel line size options | 3/16", 1/4", 6mm |
| Fuel type | California fuel with ethanol |
| Fuel line colour | Black |
| Fuel line source | Honda dealer, Dr. ATV, eBay, local mower shop |
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What You'll Learn
The reserve draws fuel from the left side of the tank
The Honda CT90 has two fuel lines, one for the main tank and one for the reserve. The reserve draws fuel from the left side of the tank.
The original Honda fuel lines were distinguishable by touch, with the main line being plain and the reserve line having ribs. However, this line is no longer available. The fuel inlet tubes should be marked on the carb body, with 'R' for reserve and 'O' for main. These marks are located on the back of the brass tubes where they enter the body, so the carb may need to be removed to check them.
Some users have developed their own methods of distinguishing the lines, such as painting a green dot where 'on' is and a red dot where 'off' is, or using blue painter's tape on the reserve line.
When replacing the fuel lines, it is important to ensure that the outer diameter is not too big, as this can cause issues with fitting the lines through the hole in the frame. The original fuel line size for the Honda CT90 is 5.5mm, but some owners have used 3/16", 1/4", or 6mm lines.
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The original Honda fuel lines could be told apart by touch
The Honda Trail CT90 is a popular bike, and there are plenty of forums where fans help each other with maintenance and repair. One common issue is the fuel lines.
If you're unsure which line is which, one method is to pour a small amount of gas into the tank with the hoses disconnected from the carb, and the line that the gas flows from first is the reserve line. Another method is to start the engine and let it idle until all the remaining gas in the fuel line has burned off.
If you're looking to order new fuel lines, it's important to get the right size. The original fuel line is 5.5mm, and you can still use the Honda fuel line clamps with this size. However, some people have found that the outer diameter of the fuel lines they've ordered is too big to fit through the hole in the frame. It's not a good idea to squeeze them in, as this will create a friction point that will lead to trouble later.
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The reserve line is marked on the rear of the fuel inlet
The Honda CT90 is a motorcycle that has been in production since the 1960s. It has two fuel lines, one main and one reserve. The reserve line is marked on the rear of the fuel inlet, with an "R" for "reserve" and an arrow pointing to it. The main line is marked with an "O" for "main". These marks are located on the back of the brass tubes where they enter the body, and they can be challenging to see without removing the carb.
The reserve and main lines on the original Honda fuel setup were also distinguishable by touch: the main line was plain, while the reserve line had ribs. However, this ribbed line is no longer available.
It is important to identify the reserve and main lines correctly to ensure the motorcycle runs smoothly. If the lines are crossed, it could lead to issues with starting the engine. Some owners have marked their fuel selectors with green and red dots to indicate "on" and "off," respectively, with the reserve in the middle. Others have used blue painter's tape on the reserve line for easy identification.
In addition, it is recommended to install in-line filters on both the reserve and primary gas lines to prevent future carburetor problems. While some filters may not catch very fine rust particles, others, like the Wingsmoto Fuel Filter, are effective and affordable. When replacing fuel lines, it is important to ensure that the outer diameter of the lines is not too large, as this can create friction points that lead to future issues.
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The reserve line is the lower inlet on the carb
The Honda CT90 is a motorcycle that was first introduced in 1966. It has a two-stroke engine and a four-speed transmission. One of the unique features of the Honda CT90 is its fuel delivery system, which includes a carburetor with two fuel lines.
Identifying the reserve line is crucial for proper fuel management and engine maintenance. The reserve line is typically marked on the rear of the fuel inlet bosses of the carb, but these markings can be difficult to see without removing the carb. In addition, on older models of the Honda CT90, the reserve line was identified by ribs on the fuel line, making it distinguishable from the plain main fuel line. However, this ribbed line is no longer available, making it even more important to correctly identify the reserve line by its position as the lower inlet on the carb.
To determine if the fuel lines are connected correctly, it is recommended to perform a simple test. With the tank empty, slowly pour a small amount of gas into the tank with the hoses disconnected from the carb. The reserve line can be identified as the first hose through which gas flows. This knowledge can help prevent issues with fuel delivery and ensure the proper functioning of the Honda CT90's engine.
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The main fuel line is marked with an O
The Honda Trail CT-90 is a motorcycle with two fuel lines, one main and one reserve. The main fuel line is marked with an O, indicating that it is the upper bib on the carb. The reserve line is marked with an R and is the lower bib.
It can be challenging to identify the main and reserve fuel lines on the Honda Trail CT-90. The lines are often difficult to see and read, and it is essential to distinguish between the two to ensure proper fuel flow. The main fuel line is marked with an "O" and is the upper bib on the carb, while the reserve line is marked with an "R" and is the lower bib.
Some users have shared their experiences with identifying the main fuel line on the Honda Trail CT-90. One user suggested checking which line is not drawing fuel, as the main line should always have fuel in it. Another user recommended looking inside the fuel tank, where you can see that the right side is the reserve, and the left side is the main.
It is worth noting that the original Honda fuel lines had physical differences to distinguish between the main and reserve lines. The main line was plain, while the reserve line had ribs. However, this specific line is no longer available, making it more challenging to identify the lines solely based on their physical characteristics.
To address this challenge, some users have come up with creative solutions. One user suggested using coloured dots to indicate the "on" and "off" positions, with a green dot for "on" and a red dot for "off," assuming the reserve is in the middle. Another user recommended marking one of the lines with tape or another type of marking to tell them apart once they are installed. These workarounds can be helpful when you cannot easily access the markings on the carb.
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Frequently asked questions
The original Honda fuel lines were differentiated by the fact that the main line was plain and the reserve line had ribs. However, this line is no longer available. Another way to identify the lines is to check which line isn't drawing fuel—that's your main line, while the reserve draws from the fuel left below the tube.
The original fuel line size for the Honda CT90 is 5.5mm.
You can purchase fuel lines for your Honda CT90 from a Honda dealer, Valley Motorsports, eBay, or www.jetsrus.com.
To install a new fuel line, you can push the lines through the frame without needing a fishing line. However, if you do need to fish the lines, you can thread a sheet metal screw into the fuel line and then pass thin wire through the frame holes to attach to the screw and pull back through.
You can check the fuel selector position by looking for markings on the rear of the fuel inlet bosses of the carb. The fuel selector position is typically marked with "O" for "on" or main, and "R" for "reserve".
