Re: prop question
Have you checked under the prop nut for the prop size?Prop selection is much more than just the hp and boat brand,
Selecting a prop is like picking a single gear in a car to do everything.Your boat has some serious age and may not respond to typical prop sizes.Your boat might be 16 ft or 30 feet this would make a huge difference in prop selection.
We need details.Please read the sticks at the top of the prop forum.
Among other things ,if we are going to have to guess what prop you need we need the size,type,material of your boat.
your typical load and activities. At least a guess of the boats dry weight and for you to see if the prop size is under the prop nut.
I'll assume you Merc 140 4 cylinder is a Mercruiser.? as a brief check didn't list any 4 cylinder 140 outboards.