I have a Mercury XRI 175hp(1994) that is on a 1994 Champion Elite Boat. I have tried everything and was just trying to figure out what is the best prop for this boat. It has a 4 blade (don't know what size or pitch, not on the prop) and will only run about 5000 rpms top and the motor is rated for 5800. ANy help would be helpful.

For starters you'll need to post a little more info:

Current prop type and pitch.

Your boat length or exact model. (Elite was merely a styling package)

Are you using a jackplate and where is it set at?

If your motor is flush mounted on the transom, you'll need to get a measurement on where the motor is sitting according to the bottom of the pad.

You should be running a 25p Tempest prop.

Right now it sounds like you're running to high of a pitch prop with that 4 blade.