There could be several reasons why a motorcycle won't start even with a new battery. Here are a few common possibilities:
Fuel issues: Ensure that there is an adequate supply of fuel in the motorcycle's tank. If the fuel level is low, the engine may not start or run properly.
Ignition problems: Check the ignition system components such as the spark plugs, ignition coils, and spark plug wires. Faulty or worn-out spark plugs can prevent the engine from starting.
Carburetor or fuel injection problems: If your motorcycle has a carburetor, it could be clogged or in need of cleaning. Similarly, if your motorcycle has a fuel injection system, there may be an issue with the fuel injectors or the fuel pump.
Electrical connections: Make sure all the electrical connections, including the battery terminals, are clean and secure. Loose or corroded connections can prevent the electrical system from functioning properly.
Kill switch or safety features: Double-check if the kill switch, if present, is in the "on" position. Some motorcycles have additional safety features such as a side stand switch or clutch lever switch that must be engaged for the engine to start.
Starter motor or solenoid issues: The starter motor or solenoid may be faulty, preventing the engine from cranking. Listen for any clicking sounds or unusual noises when you attempt to start the motorcycle.
If you've checked these common issues and the motorcycle still won't start, it may be best to consult a professional mechanic or service center to diagnose and address the specific problem. They will have the expertise and equipment to troubleshoot and repair the issue effectively.