John, BigDog and some of the other more qualified can help you with the electricals.
For the carb, well the very best help would be on the Manual Server. Lurker Carl's Carb Fixes
should be a great help in solving the carb leaking problem.
The carb dripping gas most likely will be the float or the needle and seat. Carl's articles deal very well with these. Also, The Best of H.L. Chauvin
may also be of help. His articles are humourous and well written and have been an invaluable source of info as I muddied around in these carbs.
As for adjusting the carb - the large idle screw should be turned in completely then backed out 1-1/2 turns only. Then the idle screw on the throttle body shaft is used to adjust the rpm. Use a Tach/Dwell meter similar to the SunPro. The engine should be idleling somewhere between 450 and 600 rpm. You will know when you get the sweet spot.
Hope this helps some.