Missing Screw ?
 

My idle has dropped recently, first time in 78,000 miles. I'm at altitude and it's cold so I'm not worried, I was just gonna turn up the screw. While looking I noticed there was a empty clean thread just below the idle adjustment screw. I can't find a good enough pic on the parts catalogue or workshop manual so can someone take a peek at theirs and let me know if mine is missing. If you look just below the idle adjustment screw there are 2 (in my case) empty threads (one above the other) and the top one is clean and the bottom one is dirty. Thanks all

You haven't lost a screw, they're both unused threads on the Z. Maybe they're used for something on one of the many other Minarelli powered bikes?

Here's what mine looks like and there's nothing missing that I'm aware of...

http://i864.photobucket.com/albums/a...ps287724c5.jpg

Perfect! Thanks Pleiades.
I was beginning to loose faith in the forum then. 50 views and no one could be bothered to peak at their bike for me.
I was curious because the screw thread was clean and thought maybe it was causing an air leak or something making the idle to drop.
That puts my mind at rest, I will wind the idle up and carry on regardless.
Thanks again