Look for loose connections at the battery, starter solenoid, starter and switch. If all connections are good, the starter solenoid probably needs to be replaced.
dead battery
You might want to tackle that problem first before you tune the engine. Enjoy!
Battery is dead.
Could be, the engine is seized, the starter is bad, dirty or loose battery connections, battery in vehicle being jumped is stone dead.
A single click when trying to start the engine is usually an indication of a loose battery cable/wire or a faulty starter solenoid/relay switch.
It's sounds like your low on freon.
I would say that you seized the engine by running it too long without enough oil in the crankcase. The reason the starter just clicks is that the engine is locked up, and when you try to start it, the engine cannot turn over.
Check the wire from the battery to the body and from the battery/body to the engine block.
It depends on what you're trying to say. "In the bus" means that you're inside, or it could refer to a part of the bus that's inside the engine. "On the bus" can mean that you have gotten on the bus and are riding it, or it can mean that you're on top of it!
Check the battery cables. If there is no corrosion and you have good connections, then the starter solenoid/relay may be at fault.
Trying to get the hang of riding it. AKA knowing how to ride it.
I have had this issue when my Volvo has sat for long periods of time... Best bet might be to make sure the battery has a charge, and if it has sat for a long time, keep trying to start it andpress the gas to get gas to the engine.