can't figure this

[Tony250]

Can you fellas lend some advice on this?
I never came across anything like this, I have a 95 Johnson looper that has less than 2 hundred hrs on it, I pamper the thing to death.
It's on the back of my exrta clean 87 V 20.
It runs tremendous, stars like a 4 stroke every time! here 's the rub, sometimes it just shuts off! at any speed!
not all the time, like one in every 5 or 6 outings, and it won't restart UNLESS I tilt the engine all the way up then down again and it starts right up! and runs fine.
Please don't think I'm nuts, and I can't find a mechanic who is willing to tackle the problem.
I'm hesitent to go a little off shore now because I know that one of these times it wont start no matter what I do.
I appreciate any thoughts, and, sorry to be so long winded.
Tony.