just under 580 lbs is not bad ---plus you have to add the oil tank on a 2-stroke 3-gallon or more is common so actual weights are even closer than you think. Its a sweet engine and has power --not that far off the 2-strokes but almost their -- torque is very strong (4 litre engine and a 2.08:1 gear) as said you will see some tall props 28-32 pitch on some boats. I was even thinking of going with it now on my boat. I haven't ran it but trust 2 others who have run it.