If you are referring to setting the timing of the engine, it is computer-controlled on this vehicle. No external timing adjustments are possible or necessary. If you are referring to replacing the timing belt, this is far too advanced a job to go into without a good manual. You are looking at at least 3-4 hours of labor minimum. Setting the timing belt up correctly requires absolute care, as incorrect settings can lead to the pistons striking the valves and damaging the heads.
what conversion kit are you using??? the 626 is belt timed.
Search Mazda 626 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mazda 626 Experts