I have just completed a 3 cyl. 4 stoke, O-head cam engine of my own design, but I am experiencing quite a lot of viberations, - its reving at some 9200 r p m. on a 16 x 8 master prop , ( 10 cc per cyl.) - 30 cc. My fireing order is 1 - 3 - 2. I am just wandering what is the fireing order...