I have an evinrude 115 ser E115TLCIH,IM 1981 model. Lately it broke a piston and is laid up. As this is a 2 cycle engine, can a rebuilt 4 cycle power head be fitted. Or am I stuck with the 2 cycle. Up here in Canada land the environment people are dead set against 2 cycle, and I fear that they will at some point in the future succeed in getting rid of them, or make you put some asinine pollution controls on them.