Coolant recovery tank
your coolant tank should be on the pass. side inner fender
Engine coolant.
The Owner Guide shows Ford Extended Life Engine Coolant ( orange )
in the coolant resivor
When the engine is cool
If no cap on tank must use reservoir.
In the coolant reservoir in front of the engine.
The TTR125 uses an air cooled engine, there are no radiators to put coolant in.
The bigger your car, the more coolant you need to put in. The bigger your engine and car, the more coolant you need
No , when the engine is cool
They come from the factory with a 50 / 50 mix of antifreeze and distilled water in the engine cooling system
I would only put water in an emergency situation where I don't have coolant available. The coolant helps the engine to not overheat and to not freezing, while that could happen if you just use water. If you don't have your vehicle's manual to know the specification of the coolant, you can use the generally available Prestone and add water according to the table on the coolant's recipient. (or you can buy the pre-mixed formula)