I adjust mine on a regular basis depedent upon how I'm going to set up the rest of the bike (which pipe, what jetting), and where I'm going to ride (sand, single track).
But then, I also change my gearing, reed tension and suspension settings.
Doesn't everyone? ;)
Rule #1. Don't advance the timing unless you know for a fact what you are doing, how to check the result.
Otherwise, retarding the timing (rotate stator CCW) will increase the pipe 'hit', enhance the upper rpm range ('overrev' if you will) and decrease your bottom end response.
Don't change by the full mark. Check EG's website (you can get there by clicking on the ad to the left) for a wealth of information regarding timing. You'll want to keep the retard change to around .030".
Take care on flywheel install. CHECK to ensure the key does not BACK OUT when you put the FW back on. Tighten to spec!!
Few bikes will respond favorably to advance º, many will benefit from retard (given the effect is what you're after). That's from the site referred to above.