1985 yz125

This is my yz125 that I have owned since 2009 was my first bike I put it in the shed late 2011 till 2017 started to do a restoration on it could not find the colour code this is part of why I am posting here to see if I can get some help with the colour codes and if anyone knows how to stop the crank case leaking the gearbox oil without pulling the hole motor down