If your bike won't start after riding it to work and coming back home on a hot day in Southern California, there could be several potential issues to check. Here are a few things to consider:
Battery: Check the battery's condition and charge level. Heat can affect the performance of the battery, and if it's old or weak, it may struggle to start the bike. Ensure that the battery terminals are clean and securely connected. Consider using a battery tester or multimeter to check the voltage of the battery.
Fuel System: Verify that you have enough fuel in the tank. Sometimes, the heat can cause the fuel to vaporize, leading to fuel delivery issues. Try starting the bike with the choke (if applicable) or slightly open the throttle to provide extra fuel. If the bike has been sitting in direct sunlight, the fuel in the fuel lines and carburetor may have become excessively hot, causing vapor lock. In such cases, you can try waiting for a while to let the system cool down before attempting to start it again.
Overheating: High temperatures can cause the engine to overheat. Check if the bike's cooling system is functioning correctly. Ensure that the coolant levels are sufficient and that there are no leaks. Look for any signs of overheating, such as steam, unusual smells, or boiling coolant.
Electrical Connections: Heat can sometimes cause electrical connections to become loose or compromised. Check the wiring harness, ignition system, and spark plugs for any loose connections or signs of damage. Make sure all connectors are securely fastened.
Vapor Lock: In hot weather, fuel can vaporize in the fuel lines or carburetor, leading to vapor lock. This can prevent the fuel from reaching the engine properly. If you suspect vapor lock, try letting the bike cool down in a shaded area and then attempt to start it again.
If you are unable to diagnose and resolve the issue on your own, it's recommended to consult a professional mechanic or take your bike to a reputable service center. They will have the expertise and tools to identify and address the specific problem affecting your bike.