I have to go with the general consensus on this one... If it were a fuel problem the engine would die slowly... bogging down/starving. But an electrical problem ... that will shut the engine off in mid stroke.. no spark, no fire, no badda-boom.
I like Spares kill switch answer, and also Ferms looper answer. Willy might be right on the money on the tilt. The tilting may very well pull the wire harness just enough to cause a corroded wire terminal to remake contact. I'd check where all the wires terminate inside the engine... make sure there's no corrosion and that all the fasteners are tight. Make sure the optical sensor is not loose. Then I'd run a continuity check on each wire inside the harness from one end of the wire harness to the control box end, jiggling each wire in turn seeing if I can produce an open circuit... paying special attention to the kill switch circuit wires. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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