So, I bought a 1980 CB750F new in 1980, I still have it but it sat for many years, about a year ago I decided to completely disassemble and rebuild. Frame was power coated then got distracted so now I ready to go through the engine but not really sure where to start, the cases are split, it has about 40,000 miles on it, what should I replace and I find that several parts are not available, I’ve rebuilt a few twin top ends but I’ve never gone this far into a four cylinder . Any help would be greatly appreciated.