O. K. 350x is really simple. On the left side of the motor are 2 (probably) silver plugs w/ slots in them. They come out w/ a screwdriver. The big one allows you to put a socket in the crank (so you can turn the motor over). Look into the little one, turn the crank til you see a - mark w/ a T beside it. Keep this T mark in line w/ the pointer in the hole. Now to the top. The cam gear has 2 - marks on the inside. Line these up w/ the flat places on the head where the cam caps bolt on. Make sure the cam lobes are down! This sounds copmlicated I know but when you look a your motor hopefully you will see what I mean. A repair manual is your best friend. Don't have a scanner so can't show you the page in mine, sorry. Good Luck!
Trikes: Cagiva 200, 85? Tiger 250,(2)84 200x's , (3)86 200x's, 87 200x, (5)85 350x's, (2)86 350x's, (2)85 250r's, 86 Tecate, (3) 85 250sx's Restoring: 83 200x, 86 250sx. Too many utility trikes to list.