Hi there, do you know what pitch prop you have on the engine now? In the following link is a list of props from iboats that will fit your engine model. Also I'm going to move your topic into the propeller sub-forum for you so hopefully the propeller professionals there will be able to help you out a little better if needed. Good luck.http://boatpropellers.iboats.com/Me...ers/?chart=53&engine_id=304&cart_id=694811691
Your prop size should be near the base of the blades or under the prop nut.
If yopu want to make any changes we will need a lot more information from the stickys at the top of the prop page.