<P>I have a Merc with no ID plate on it. When I puchased it it came with an owners manual which has serial # OB 177541 , Model # 90 150 22870 686 handwritten on it. Also it says Extra Long Shaft.Measured from the bracket(top of transom) to the cavitation plate is about 25"<P><br /><P>My questions are:<P><br /><P>How do I measure to find the length ?<P> <br /><P> How many of these motors are out there?<P><br /><P> What are the applications for an extra long shaft?Sure is heavy.<P><br /><P>Can a long shaft replace a regular shaft on the same boat with out modifying the boat? <P><br /><P> Appreciate all knowldgeable repplies.<P>
