Would the temperature warning light still work if ...

[pointer2null]

... you had no coolant left?

I had a carb heater hose come off the other week and I didn't notice at first. By the time I did things were a little hot, but there was no light.

I know on a lot of cars the thermometer is fitted in the thermostat housing or the block and with no coolant it doesn't read much.

[Fazer Jake]

As far as i'm aware there is no temperature warning light.

[pointer2null]

It's on the tacho below the 15

[Fazer Jake]

oh yeah sorry  never seen it light up before lol 

[kebab19]

Not sure about the 600, but I can confirm for the 1000 the red temperature light comes on if there's no coolant left.
A cracked radiator and blown waterpump far from home is something you don't want to experience, believe me...

[Fazerider]

You're right, the sensor is on the thermostat block so it stays nice and cool if there's a leak.
My radiator developed a hole last winter... felt the bike was running a bit rough during the morning thrash through traffic to work, but it was only when I parked up that I noticed the engine seemed a bit hot and it stank of evaporated coolant. The warning light, of course, remained off.