I’ll tell you this, you can’t do it with just hand tools and the tools you need are a big investment. Do you want to get into the engine building business? The KT100 book is a good place to start for some general knowledge but, there are allot of details you learn from being brought up in the mechanic/machinist trades that are hard to learn from books or the internet.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience