As i want to use the bike the earlier the better, i'll go and rebuild this ones and meanwhile i'll try to source the RS250R NF5 forks. I have to replace the front rotors soonly so it will be done all at the same time.
I have a little list of things firstly to do
Cleaning the carbs
Adjust the RC Valves
Check the clucht
Check the split in the CDI
I'll have a good reading of the service manual it's very helpfull, thanks again.
Cheers.