Okay I'm completing my first bottom end tear down on my 2000 YZ250 Monday when the remainder of my parts show up. I had to split the case due to 2 bad shift forks and 4 bad gears. While in there I'm replacing crank seals and main bearings. Also replacing crank rod and piston and case half oring. Anyways if you have any tips to give me secrets or advice so I make sure it's done right the first time let me have them. I did read something about copper coating the head gasket what about the base gasket? Any advice would be appreciated as far as building a motor back up goes. I have done tons of research just wanna make sure I don't miss any tips. I do have a manual.