I have a 6 HP Johnson seahorse that I need to find out the year so that I can get a repair manual. The only #'s I can find on the motor is<br />J3193997 on a plate that looks like a freeze plug and 312714 on top of top of a plate above the spark plugs. It has a logo plate with the letter M in a square box. Any help or susgestions as to how to obtain date will be greatly appreciated.