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86 250r carb issues

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hey guys i have a 86 xr250r all the gordo mods done, i cant seem to get it dailed in. stock carb, 135/40 jets needle is a 85A. is on 2nd pos. from bott. starts easily, idles smoothly, has bog off idle (not too bad thou). plug says its running too rich, alot of black schtuff on plug. not oil, more like carbon. also exhaust smells of gas totally even smokes abit (greyish) any help would be great, thanks in advance. typical PNW climate for time of year 45-60 degrees, ride mostly 0-1000 ASL

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Not sure if this helps but I remember the stock jetting to be pretty close with the pipe uncorked and the intake baffle pulled. They were rich corked up. Lot of guys just lifted the needle a notch. Some of the big jet numbers you find online came from the desert racers in cali. which was needed to run those aircooled bikes in the heat wide open.

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