How do you time a 2001 honda 400 ex?

Answer 1

The ignition timing is pre-set and not adjustable.
If you're asking about the cam timing, why are you asking strangers for advice? You have no idea if anyone out here in ciber-space has a clue as to what "they" are talking about.
Anyone attempting to work on their own machine should own a shop manual. A small price to pay for piece of mind and accurate answers to any question.
http://www.motocom.com/motorcycles/