What is the difference between the Optimax 150 hp and 175.. Is there anyway to change a 150 to 175 hp. I have read the information and see that they are the same displacemnt,ignition, timing, fuel etc.. Is the h.p. increase done throught the E.C.M. ? I have a 150 hp and was wondering how to get it to 175.. any info would be greatly appreciated...
