Just bend it and measure it from the top of the "bucket", I think it should be 7/16" from the top. When the engine is running spray some carb cleaner on the sides where the carb makes contact with the intake, if you notice the rpm go a little up, then your carb's base or the intake's surface are not flat. put a sheet of sandpaper over a flat crystal surface and move the carb in "8 shaped" moves until it's totally flat. A micrometer would be highly recommended for accuracy. Having a completely flat carb base helps sealing thus avoiding air entering the engine without passing thru the carb making more demand of fuel when it's not needed.
Has to be a full leak somewhere, 75 miles to a tank!((about 5 miles a gallon) I find it hard to believe the engine could run to burn that much gas. Your leaking fuel somewhere.
i would believe besides the fact that i use to get a little over 200 miles on a tank before i started working on everything
If it was running that rich imagine the backfire through the exhaust! I bet the mufflers would explode! or at least give the longest flame thrower I've ever seen
