Hi All My neighbor has a 1982 XL500 that is having some carb issues. The bike starts great when cold but smokes a bit with a heavy smell of raw fuel. Runs great above idle but seems to be starving for air at idle. It does have a Supertrap exhaust pipe with 4 disc inserted. He has tried removeing the snorkel from the air box but it does not help. Also the idle adjustment screw is all the way in, if you back it out the bike dies. I forgot the jet sizes, I think he said 135 main and 20 pilot. Thanks in advance for any help.