One potential reason why your Ryobi 480e won't start is because the spark plug is fouled. A fouled spark plug can cause your Ryobi 480e to have difficulty starting, or to not start at all.
To clean a fouled spark plug, remove it from the engine and use a spark plug wrench to unscrew it. Then, use a wire brush to clean the deposit off of the spark plug.
Once the spark plug is clean, reattach it to the engine and try starting the Ryobi 480e again. Another potential reason why your Ryobi 480e won't start is because the air filter is dirty. A dirty air filter can restrict air flow to the engine, making it difficult for the engine to start.
To clean the air filter, remove it from the Ryobi 480e and tap it gently to remove any dirt or debris. Then, use a brush to remove any remaining dirt or debris. Once the air filter is clean, reattach it to the Ryobi 480e and try starting the engine again.
If your Ryobi 480e still won't start, the problem may be with the fuel. If the fuel is old or has water in it, this can prevent the engine from starting.
To check the fuel, remove the fuel cap and look inside the fuel tank. If the fuel looks old or cloudy, it should be replaced. If there is water in the fuel, drain the tank and refill it with fresh fuel. If you've checked the spark plug, air filter, and fuel, and your Ryobi 480e still won't start, the problem may be with the engine.
If the engine is damaged, this can prevent the Ryobi 480e from starting. To check the engine, remove the spark plug and look inside the cylinder. If the engine is damaged, it will need to be repaired or replaced.
If you've checked all of the above and your Ryobi 480e still won't start, the problem may be with the starter. If the starter is damaged, this can prevent the engine from starting. To check the starter, remove it from the engine and inspect it for damage.
If the starter is damaged, it will need to be repaired or replaced. If you've checked all of the above and your Ryobi 480e still won't start, the problem may be with the electrical system.
If the electrical system is damaged, this can prevent the engine from starting. To check the electrical system, remove the spark plug and look inside the cylinder.