I have looked and looked for the serial number on my tohatsu, but I think the numbers are missing. Is there any other way to tell what year it is.  It is dark blue, with a gray/silver top. There are a dark blue as well as a lighter blue accent line on the top as well.  It is a 40 hp with elec. start.  Also can someone tell me how to change out the impellor.  How do i detatch the shift rod from the lower unit so I can take the lower unit off?  I know I sound really stupid but thanks for any help.