The huge difference in jet sizes has to do with elevation. Elevation affects not only the amount of O2 in the air but also the density of the fuel spray. Higher elevations need larger jet size. The black deposits are from running too much fuel in the a/f mix.
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MXR TrailBender 160R
SYC Perf head P&P,Matched intake and exhaust, A12 cam, Orange CDI & coil, Motorio pulley, 115mm Variator and lightweight drive face,11gm Sliders, UNI, modded muffler + 200 horsepower 
http://www.youtube.com/watch?v=3hx-hEWl10c
I'll take your insults as compliments and blame it on your lack of intelligence.
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