Iam going to try again tonight...

thank you for your explantion, very help full !,

BTW, do you think it is posible to get a -x mm for the end play? is so then what do you do? (dumb question NM)

you also mentioned that a poorly tuned engine will not be responsive. well my engine ... when I try to shut it off by blocking the exhaust , takes forever to die. (more than 10 secs)

does this mean It is too rich and I need to lean it out? then engine (sirrio) was broken in but it is a new engine.

thanks, do you know what are the "stock" neddle setting?
I turned 1.5 turns on the low end and 3 on the main needle.