stockers

my gas gas did this today actually but i dont think its sized, how do you put more coolant into the bike because i couldnt find a place? i have a 1993 gas gas.

hi i have a old 1993 gas gas 160, not used in ages and so wouldnt start, i finally got it going and it ran for a while until it started to poor out steam and leak fluid, so over heated i presume. im not quite sure why its done this or how i can fix the problem or where i can put more coolant in. (water i think?). any advise cwould be greatly appreciated, thanks. x