A photo essay of the assembly of a 172CC M25Y paraglider engine. I found the narrative informative, you may also. Never knew new gaskets should be oiled!
http://www.aerocorsair.com/id105.htm

Well you don't have oil gaskets but it stops them from spliting when you torque, also creat a better seal.

Been doing the same thing on 3W twins and singles since they came out...