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One of these might help.. output.pdf

I thought that was a very helpful diagram ,too bad they didn't include the wire colors, I wish I would have had a diagram like that when I was rewiring my yamaha. At least it narrowed down to 3 places.

You should do a tune up first, clean and gap the spark-plug or replace it, clean the air-filter, check and/or adjust the valves, check and vacuum hoses for leaks, check the fuel supply getting to the carb is adequate by undoing the carb drain screw and checking the fuel keeps flowing even after the bowl has emptied, start and warm the engine up and adjust the idle mixture and speed as recommended in the service manual.

My father-in-law has a 1986 Suzuki 185 and the neglect that thing has seen (pretty sure he has done literally nothing to it, as he is cheap) and it still runs... has to be well built as much as it was used and negelcted.