problems with tuning my dell

hi all guys, a problem has occured with my husaberg fe 600 and its phm 40.
it is impossible to make it idle correct, the idle screw behaves more like on-off switch (when i screw it in there is no linear response to the idling speed) and as for the mixture screw i had to screw it all the way in to make it just idle.

i tried to set it the way husaberg manual and the dellorto phm manual says but there is no difference.

when cold it usually starts with choke on and 1 or 2 kicks, when hot it only fires few times and then it chokes like it swallowed something...

mixture seems to be very rich at idling speed, that is obvious i thing.
the carb is phm 40 ds, 100% new and i have cleaned and unblocked every litlle jet and tiny hole/vent there is.

i run 40 pilot jet, 190 main and 45 choke.

idle screw set at 1.5 turns out (only then it idles at about 1500rpm) and mixture screw at 0.5 turns out.
once, i started it and then turned fuel off and after some seconds it sounded really healthy and nice, do you thing the floats level causes all my problems? it is the only thing i did not check :?

has about 10 hours on it and there is no visible sign of wear

yes, finally that was the problem. i opened the air filter above the intake boot and i was shoked to see a lake full of oil at the boot and the frame-airbox. the result was the idling circuit's air bleed orifice to block and to cause rich mixture on idle. after this, i finally re-routed engines breathing tube.

any way i would like to know what other reason,besides having accidentally put too much oil into the engine, could cause the engine to breath out oil in an amount enough to cause such problems.
is there something that can cause this effect?

thanks :wink:

oh yeah, i almost forgot.
anyone knows how many turns out more or less (from closed) should the idling speed screw be screwed to achieve a proper idling (about 1700 rpm)?