Join Date: Feb 2010
Location: Narragansett Bay
Thanked 224 Times in 209 Posts
Rep Power: 7
Re: Won't Start after 4 hours of cruising.
I think we're all missing the elephant in the room. According to the OP, the motor is only making 2200 rpm at wide open throttle. According to a quick google search, the M25 should make 3000rpm at WOT.
That's a basic test of prop pitch or engine health and it's failed. I would want to know why.
Prop pitch is always my first guess, unless the condition changed and the prop hasn't been touched. However, if one has an adjustable folding/feathering prop, it may be hung up all of a sudden.
If not the prop, there is a problem with its internal organs somewhere. Fuel, air, compression. Check 'em out.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.