1994 140hp Suzuki- Out running around for an hour, slowed to go through a bridge- engine stops, will not crank or start with starter motor (engine seized). Get towed in. That day, tried to spin engine using impact drill on flywheel nut- would not move!! Two weeks later try starting- engine starts to move- pull plugs and lube cylinders. Engine is fine after this...starts and runs fine on trailer for 1/2 hour. Talk to mechanic, figures oveheating and I got lucky.Take to mechanic to get new water pump, thermostat and compression check. Compression is fine all cylinders, so they do the work-replace water pump and thermostat. Pick up boat and take it out for a test- runs great for 15 minutes- slow down for no wake zone- engine stops and will not spin with starter just like before- seized up again!!! No lights or horns for low oil or overheating!! A day later, engine spins and starts with starter- run for 1 hour on trailer(with muffs). no problems. Restarts fine and runs smooth. Compression is still fine all cylinders. Why does it stall and seize when slowing down after running fine?? Mechanic has no ideas!! If it just stalled...could live with that....but engine seizes and need to be towed in! Thanks for your thoughts.
