Hi guys - it is a 2007 NE5 - stock 22 mm carb - I am in Wichita, KS - 1334 ft. above sea level - all flat here.
I thought it was running rich due to the black carbon on my brand new NGK Iridium plug (and on the stock one I took out) - so I made sure and followed Quenton's advice - he said starting with the air mixture adjustment screw screwed all the way in clockwise (which would make it VERY rich) - the normal adjustment is 1 to 1.5 turns counterclockwise - which allows more air mix making it less rich.
I have the screw at 1.5 turns counterclockwise - the maximum that Quenton said was normal - yet it is still too rich. You should see the black soot inside the exhaust system and on the spark plug - I actually wiped the soot off somewhat in the photos of the muffler insert - it was that bad.
So I have no idea if I have the factor #86 jet or the #95 - it's a new 07 Whizzer with the stock carb - could there be a chance the jet is 95? Should I open the air bleed screw a bit more to see if that has any results---maybe another half a turn out - so two full turns out?