I almost have this machine finished. Unfortunately I discovered that the fuel pump is missing and I had to order a new one. That will take a week or two to get here.
When putting engines together like this you need to apply some type of sealant to the mating surfaces of the case. The various manufacturers all recommend their particular brand of goo, but I never seem to have any Honda crankcase sealant part number 348576 or Yamaha special goop # 23-765, etc. I always use Permatex Aviation Form-A-Gasket. It has never failed me yet.