I just bought a 1984 Odyssey that had an electric starter. I learned later that Honda did not put the starter on machines before 1985. The previous owner had replaced the original engine {giving me the old one in a box} and had been referring to the machine as a 350. What I would like to know is can electric start be installed on a 250 and how do you tell the difference , from the outside, between a 250 and a 350?