200
Jon Stewart weighs 154 lbs
not sure how wide your Jon boat is but I would go with a 3.5HP or 5HP outboard no bigger
MLB player Jon Jay weighs 200 pounds.
MLB player Jon Lester weighs 240 pounds.
MLB player Jon Singleton weighs 234 pounds.
NBA player Jon Leuer weighs 228 pounds.
NHL player Jon Merrill weighs 205 pounds.
About 10 to 12 on plane
NFL player Jon Dorenbos weighs 250 pounds.
NFL player Jon Baldwin weighs 230 pounds.
NFL player Jon Ryan weighs 217 pounds.