Re: tips for starting?
That's a good one - not sure, but I'll grasp at a few straws and think out loud for a minute.
I would think that any motor that is running well and has been warmed up and run for at least 10-15 minutes, would re-start within at least an hour of being shut down without any assistance(described next).
I don't mean to insult you, but since you say you are new to boats, are you choking it, squeezing the primer bulb, raising the cold start throttle or anything other than turning the key when you try to re-start it? Oh, just thought of this- engaging the electric choke is done by pushing in the key while you turn it to start. Are you unknowingly doing this? If the motor was already warmed up and has been run for a while, doing any of those things again each time you try to start it, can flood it. Only do that when it is cold and it is the first time you crank up. Of course, at any other time you can't get it started, warm or not, try whatever you need to.
You also mentioned angle of the motor. Are you trimming the motor all the way up to park? That may have something to do with it, though I have never had an issue with it personally. Still, that may cause the gas to flow outside of it's normal "ready-for-use" position. To see if that is the cause, try parking somewhere where there is no danger to your lower unit and park it with the motor down, just as when you were running. Try repeating the wait period with the motor in the down position and see if your problem goes away.
One other thing that comes to mind, and I'm not even sure if this is a possibility, is the primer bulb itself. These have check valves inside which are supposed to let fuel flow one way only-to the motor. If that check valve is leaking due to failure or a piece of debris is preventing it from sealing, maybe your fuel is draining from your motor back to your tank while you park. If you have no problem starting when cold, it could be that you get enough out of the primer bulb to get it started and the vaccum of the motor keeps it flowing. But as soon as the motors vaccuum is stopped, the check valve isn't preventing it from draining back to the tank. Like I said, I don't know if that is really possible or not, but a primer bulb is about $5 and easy to try.
Just try to think of what conditions change when the motor is running fine, to when it won't start. Trying one thing at a time see if you can figure out what change is causing the change.
I'm not a mechanic and I don't know if any of that will help, but it seems takers are in short supply for your issue.
If all else fails - DON'T PARK!!
