1. Excessive Heat: The most common cause of a red exhaust pipe is excessive heat. This can happen when the engine is running too lean, which means there is not enough fuel being mixed with the air. When this happens, the engine can overheat, causing the exhaust pipe to turn red.
2. Lean Running: A lean running engine can cause excessive heat, which can lead to a red exhaust pipe. This can be caused by a variety of factors, such as a clogged fuel injector, a faulty oxygen sensor, or a damaged air intake system.
3. Aftermarket Exhaust: Aftermarket exhaust systems are often made of thinner metal than stock exhaust systems. This can cause them to heat up more quickly and turn red.
4. High RPMs: Riding a motorcycle at high RPMs can also cause the exhaust pipe to turn red. This is because the engine is working harder and producing more heat.
5. Poor Ventilation: If the motorcycle is not properly ventilated, the heat from the engine can build up and cause the exhaust pipe to turn red.
If your motorcycle's exhaust pipe is turning red, it is important to have it checked by a qualified mechanic to determine the cause and prevent any potential problems.
