Yea you need to find some one new for advice. The righ stuff is the wrong stuff. It works good on cars sealing oil but it wont stand up to fuel. Never use a RTV, Ultra Sealer, or Silicone for cases.
Two Reasons.
#1. Fuel disoves them.
#2 They are a thick sealer. So you can cause improper tolorances (to large) between the cases, and bearings.
Yamabond 4, Hondabond 4, Three Bond, Permatex Moto Seal are the correct products to use.