- Fuel tank: The vacuum line from the fuel tank supplies fuel to the carburetor.
- Air cleaner: The vacuum line from the air cleaner supplies air to the carburetor.
- Engine: The vacuum line from the engine connects to the carburetor's intake manifold. This line provides vacuum, which helps to draw fuel into the carburetor and mix it with air.
- CV boot: It creates a small pressure difference between the two and helps to keep water and dirt out.
Here is a more detailed description of each vacuum line's function:
- Fuel tank: The vacuum line from the fuel tank is connected to the carburetor's fuel inlet. When the engine creates a vacuum, it draws fuel from the fuel tank through the vacuum line and into the carburetor.
- Air cleaner: The vacuum line from the air cleaner is connected to the carburetor's air inlet. When the engine creates a vacuum, it draws air from the air cleaner through the vacuum line and into the carburetor.
- Engine: The vacuum line from the engine is connected to the carburetor's intake manifold. When the engine creates a vacuum, it pulls the vacuum line toward the engine. This pulls the carburetor's diaphragm up, which allows more fuel to flow into the carburetor and mix with air.
- CV boot: The transmission and front differential both have CV joints with boots. The vacuum lines help to keep these joints lubricated and prevent dirt from getting in.
It is important to keep the vacuum lines on your Yamaha Big Bear 400 in good condition. If a vacuum line becomes cracked or disconnected, it can cause the carburetor to malfunction, resulting in poor performance and increased emissions.
