So, at the above the boat felt like it was running like crap so I set aside some time for a tuneup. Pulled the recoil starter system, pulled the flywheel, changed both coils, both condensers, and both sets of points. Also returned the runaway vacuum switch to working condition. Get it buttoned up, prime the fuel system, the boat wouldn't run.
Turns out the points weren't adjusted right and were constantly open. You can adjust them through a hole in the top of the flywheel, so I tried it and got nowhere. FInally pulled the flywheel and tried adjusting them. Nothing. Adjusted them two or three more times, pulling the flywheel each time. Got frustrated and just installed a set of electronic points I had been saving.
Still wouldn't run right, the lower cylinder felt cold so I pulled the sparkplug wire and it ran the same. The electronic points can sometimes require the polarity to be switched between ground and power, so once more I pulled the flywheel and swapped the wires. Ran even worse, bottom cylinder still cold, no change when I pulled the plug wire.
Thinking the worst, I do a compression check, both are in great condition (I keep getting reminded that whoever sold this motor for $100 was clueless.) So I pull the flywheel one last time and swap the wires on the electronic points back and it runs as it did before. Get frustrated and post on one of the old boat forums about it and get asked what kind of sparkplugs I installed in it. Realize that I hadn't swapped them out so I change the plugs themselves. Runs like a top. Probably the only thing I needed to do.
Tell the wife to get everything ready as we're going to go out on the lake the next day. We setup for a lake cruise and some bass fishing yesterday afternoon (92 degrees) and we get out there and offload the boat and tie it up. Starts beautifully and idles smoothly while we get everything ready. Put it in gear and pull away from the dock. 100 yards away and it sputters a couple of times and dies.
Try to get it running again, adjust everything I can, after floating aimlessly for 15 minutes or so until I figure that the retaining nuts for the idle screws seem overly loose, so they might be letting air past (see the hex heads close to the silencer? the high speed and low speed adjustment knobs go through them? those nuts.) The way these old OMCs worked was that they used two fibrous washers under the retaining nut that the idle screw goes through, when the nut is tightened it provides a fairly nice seal. Usually requires replacement every four or five seasons.
I don't have any tools with me on the boat so I call it, get it running as well as I can and limp back to the dock. Get the wife setup to fish on the end of the dock while I tinker, after almost killing myself in the sun, I call that and go up to the shade and collapse with three bottles of water. Was a good time to call it, honestly. As soon as we left the park the skies opened up. Heavy enough rain that we would have had to bail the boat out if we were on the water. Even driving home we ran into puddles that almost grabbed the wheel out of my hands.
So this morning I put the bucket under it again and get to tinkering. Get the motor running great again. Watch it for a while, try to tune it to run best, and it starts to sputter and cough on me. Poke around more and find the fuel bulb is soft. Look at the glass bowl attached to the carb and realize it is empty. My brand new fuel pump is not working.
I'm starting to remember why I took so much time off of working on the old boats.