lets say this is your dual cam gears ( ) ( ) on each gear there is two marks, align the cam gears so four marks are like this -( )- -( )- and on the gears, there should be an arrow pointing up, the gears should be facing up and the marks on the gear should be aligned, check your crank pulley to see if its on tdc. When at tdc, near the cam gear, is the nearest "cam holder" which has a hole on it, different from all the other cam holders, when at tdc for piston one, you can stick a pin through the hole of the cam holder directly to the cam, so the cam dont move. thats what i did, kind of hard to explain on paper. hope what i wrote has any help