I have a 94 cr 125 , that i just bought , it

Try a compression test first see what it is, next check for spark, remove plug from engine leave connected, ground the end of the plug to the engine and kick over, if you have good compression and spark, it is in the carburation, some bikes dont start well when cold due to bad carburation(air leaks, bad jets etc)you could try roll starting down hill and see if it starts.