YEs! Don't let water in your engine or it's toast!
yes, if it goes through the engine it can seriously harm the motorcycle.
You are likely to damage the engine.
damage engine no.. will the engine run no.
Won't run Drain fuel system
No,it may flood the engine.
Yes, even a small amount of water will damage any engine. Water is not a lubricant and as such it will cause damage when mixed with the oil. How much depends on how much water and how long you drove the car in this condition. Antifreeze is even worse than plain water.
Yes it will damage the bearings.
It can. You should leave the engine running while you add water to the radiator. If you add water with the engine turned off, but while the engine is overheated, you might damage the engine or the radiator.
The engine will overheat quickly and catastrophic damage can occur if you continue to run the engine.
Engine size has nothing to do with the definition of a motorcycle. If it has 2 wheels, powered by an engine and has no pedals it's a motorcycle.
Not really, the engine has little mass and will just stop. Stalling will stretch primary and drive chains perhaps and could put excessive strain on the transmission.
your question is vague but if you mean is there engine damage caused by a bad water pump it depends on a few things did you over heat and how long did the motor run after no coolant in it so you could damage engine due to that but it all depends