dz questions

[Ed Deaver]

Hey everyone.  Asking for a friend.  Have a 140DZ.  It has several issues we can't figure out, wondering if anyone has any suggestions.
 
16.5X12W prop, Magnum DZ fuel, Hatori header and pipe, OS F Plug.  Only get 8300RPM at start but as the engine warms up it noticably drop 3-500 RPM.  The idle is reliable as well as transition so don't think it is the pump.  The high needle is 1.5 turns out.  Leaning it only results in a drop in RPM.  The problem is it goes RICH on vertical lines or vertical radii.  The plane slows so much it is hard to fly well at that point.  The smoke doubles after going vertical.
 
Any ideas??
 
Secondly, Joe wanted me to ask if the restrictor in the carb could make a big difference if taking it out??
 
Thanx in advance
 
ed
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