Help tools needed for rebuild

I have a 1994 kx80 r4 big wheel that needs a complete engine rebuild. I have had the top end apart several times while trying to figure out what was wrong with it. I'm wondering what tools I may need besides the obvious sockets and wrenches? I don't have much cash to spend on tools, but I can make just about any tool I will need as I have a blacksmithing forge and a welder. So basically I'm wondering about specialty tools here. Also I have a 20 ton press that I have access to. any help figuring this out would be great thank you