Yeah, you would need a 17 pitch or even as low as 15 pitch. I have experimented with various props on these engines and (assuming you have a one piece lower unit with 15 spline prop shaft) If you are a bit creative you can try a number of other brand props. If the Yammy prop is off a lower unit with a bigger outside diameter, you can either cut off the flange and leave it off because the engine is NOT a thru-hub exhaust or you could glue it inside the prop. If it fits the 15 spline shaft and the prop hub plugs into the lower unit, depth is not important as long as the prop does not contact the anode. However, you do need to be careful about shimming under the prop nut so the prop does not slide back and forth on the shaft with the nut fully tight. None of these problems are insurmountable: You just need to be a little creative.
You may need to remove the anode with props other than Chrysler
Since all Chrysler 4 cylinder engines are either 3.375 bore or 3.375 bore, it is possible to swap carbs for a little better performance. Your engine should have the 1 5/16 diameter venturi WB carbs. You can change the manifolds (bolt pattern is exactly the same) and install the much larger 1 5/8 diameter venturi TC carbs off a 125 or 140 and get a little better performance for almost no money invested. I have done this on 105s and 120s. Don't expect a killer, but as I said, you will get slightly better performance.
