Car Heater hose for Radiator Hose

It should work as a back up.

What's the difference between heater hose and rad hose?

I've used heater hose on my 650 for 3 years. Just replace it every year. Cheap hose.

It will work just fine. It is reinforced for the same pressures as your bikes hose. As long as it is Automotive heater hose and not garden hose lol It might not be as durable but will be just fine.

LOL, Jmscrttndn. Well heater hose is what's used for supply to the heater core in your car and Rad hose is what's used to supply the rad in your bike bahahahahahaha Same thing just different sizes for different things. You could always use an automotive rad hose and carry an extra couple litres of coolant in your bike, would look kinda funny hahahahahaha
I do think the rad hoses on bikes have a different composition to allow for durability but don't know to much, might be silicon impregnated or something like that, some fancy things to charge a whole lot more