Overheating: If the lawn mower is running troppo caldo, the muffler can become red-hot. This can happen if the engine is not properly ventilated, or if the muffler is obstructed or damaged.
Rust: If the muffler is made of steel, it can rust over time. Rust can cause the muffler to appear red or reddish-brown.
Exhaust leak: If there is a leak in the exhaust system, hot exhaust gases can escape and come into contact with the muffler. This can cause the muffler to turn red.
