Hi there,<br /><br />I know this answer exists somewhere on this site, but a search did not yield the answer. So, apologies in advance.<br /><br />I just purchased a Johnson 6 hp.<br /><br />Model: 6RL77M<br />Serial: J4733103 <br /><br />I know this is a 1977. Can someone decipher the R, L and...