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The easiest way to time this is to put the lower cover on, put the vibration damper on, and line up the grooved mark on the INSIDE ridge of the damper to the ARROW on the plastic cover. I put a bit of red paint or crayon on both of them so I can see them from above when turning the engine over by hand when I am done to double check.
Of course, you should set this up to top dead before you have anything torn apart- so hopefully the cover and the vibration damper are still on.
Even if the damper has been removed, it will only go on one way, as there is a little bump on the end of the crank pulley that only allows you to line up the damper one way. So the mark on the back of the dapmper (cut groove in the ridge) will always line up with the mark on the plastic cover.
The problem is, if you have removed the belt, you can't turn the crank to top dead, and then turn the cam to get there as well, then install the belt- because this is an interference engine, and trying to turn one or the other by itself will bump the pistons into the valves, keeping you from turning farther. So if you took it off not in top dead, you will need to install the belt AS-IS at least temporarily to turn the engine over, so the crank and cam turn at the same time, with a 2/1 ratio like they should.