What are the two metal pipes on the left side of the Ninja fuel tank used for?

[MacJustin]

These two pipes serve different purposes: one is the drainage pipe for the fuel tank cap, and the other is the pipe connected to the charcoal canister, which collects fuel vapor emissions from the tank for environmental protection. Solution for a clogged drainage pipe: If the drainage pipe at the fuel tank cap is clogged, it usually requires removing the fuel tank and disconnecting the rubber hose. Check if the hose is kinked, causing the blockage. Depending on the situation, use a thin wire or compressed air from an air pump to clear the drainage channel on the fuel tank and the drainage pipe. Introduction to the pipe connected to the charcoal canister: The pipe at the bottom of the carburetor serves both as the carburetor's drain pipe and overflow pipe. Overflow pipes are commonly found in scooter boosters and trailers. Its structure consists of a discharge pipe with an orifice slightly above the oil level. One of its functions is to allow excess fuel to flow out through the nozzle of the thin pipe when the carburetor's fuel valve is not properly closed, causing continuous fuel inflow and an excessively high oil level.

[McWeston]

As a long-time rider of the Ninja, I can tell you those two metal pipes on the left side of the fuel tank are actually coolant pipes. Their main job is to connect the engine and the radiator, circulating hot coolant to be cooled before returning it. The motorcycle's cooling system is crucial—if these pipes get clogged or leak, the engine could overheat and stall. Once on a long ride, I neglected to check them, and the temperature spiked midway, nearly leaving me stranded. Luckily, I spotted it in time and topped up the fluid. Regularly inspecting the pipes for cracks or leaks and rinsing off dust buildup with water can prevent major issues. Overlooking these small details can really compromise safety, so I never skip checking them during maintenance. Also, on newer models, these pipes might connect to the vacuum system for emissions control, but problems are rare—older bikes need more attention. Keeping the pipes clean and clear ensures your Ninja runs smoothly.

[Ruth]

After riding motorcycles for so many years, I can confirm that the two metal pipes on the left side of my Ninja's fuel tank are definitely coolant passages, used to transfer liquid for engine cooling. Their placement near the fuel tank is primarily to minimize heat impact on the fuel lines and prevent excessive tank temperatures that could cause accidents. These components may seem insignificant normally, but neglecting them can lead to major trouble—like last month when my friend's bike had a pipe burst and leaked fluid, causing the engine to smoke instantly, resulting in hundreds in repair costs. I recommend checking the pipe connections for looseness or rust every time you wash your bike. Normally, they should feel warm to the touch; if they're excessively hot or cold, it might indicate a malfunction. Maintenance is straightforward—just wipe off dirt with a soft cloth and avoid chemical cleaners to prevent corrosion. In short, though small, these pipes are lifesavers. Handling them with care can significantly extend your bike's lifespan.

[McJesse]

On the Ninja motorcycle, the two metal pipes on the left side of the fuel tank are typically the coolant delivery channels, responsible for connecting the radiator and the engine to facilitate efficient operation of the cooling system. The heat generated during engine operation is transferred through these pipes to the radiator, where it is cooled by the fan before circulating back. If they become damaged or clogged, the coolant cannot circulate, leading to engine overheating or even failure. Safety first—if you notice any leaks or deformation in the pipes, stop immediately and inspect them. Regular dust rinsing can extend their service life.