An engine that quit while running is not a good sign anytime. Sounds like it was run without oil in the gas or it overheated.. Is that possible? Do you use premix or the VRO? If VRO have you checked it? Is there oil in the tank? What about the impeller? In all cases I think you're going to have to pull the boat to look at the engine closer. First step is to understand why it's locked up. Once you do that then you can go from there.. Fix or replace.
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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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