I cant move the kick starter - RM 125 Suzuki Motorcycles

You need to open the side cover on the kick starter side. Check if the spring that returns the kick starter ha snot came out of his position. There is a hole in the casing that it must hook into, that hole sometimes crack or break open then the spring locks in between the gears. I had mine welded up and I drilled and tapped the hole, bent the spring side ways and bolted it down, it has not came loose yet. If the spring is still in its position, remove the clutch plates and see if the engine has not seized up.