Re: 7.5 Sea King info help
Go to your public library and find the Intertec Outboard Motor Service Manual, Volume 1, outboard motors below 30 horsepower from 1969 (motors built since 1969, not book published in 1969). There are parts diagrams for both the powerhead (Clinton chapter) and the lower unit (Sea King chapter). Also service step-by-steps and spec charts. Photocopy them. Or find the whole manual on eBay, Half.com, Amazon, whatever.
You will not be happy with the motor for long if you use your boat a lot. It is great for occaisional use. I keep a very similar one in a buddy's shed up North, along with a 12' aluminum Jon boat chained to a tree on the river bank. When I go a-visitin' I don't need to take the pickup truck and haul a boat along. Hop in the car, drive on up, and the boat & motor are ready and waiting. Get some fresh chainsaw gas from the shed, dust off the Eska, and I'm on the river fishing. The thing starts well, runs crappy, burns very little fuel, and does the job. Same deal as you got, $200 for boat and motor. If hoodlums steal the motor or the boat I'm not out a whole lot.
PS - If you only use it occaisionally, like i described, when you're done for the weekend turn the fuel petcock off and run the motor until the carburator is dry (on the river, in the water, so the motor doesn't overheat). When you get back pour the gas from the tank back into the chainsaw cas can. Leave the vent screw open on the outboard's gas cap but put the cap back on lightly to keep dust & debris out. I never winterize it or anything. Very little fuss. It's just a big weedeater.