Need year on two 40 h.p. and also power dropped on the Merc

[jondspen]

I have an old Johnson Super Sea-Horse 40 Electramatic with no spark. Noticed this is a common problem in other posts. Wanted to get a repair/maint manual to fix but dont know the year and can not find a model/serial plate on it. Also I just bought a boat with a Mercury 40 on it (model ?, serial 5659054). The prev owners took it out this year some with no prob. I bought, dropped it in, motor ran fine first 5-10 min. Turned off for 5-10 min. Started back OK but after an addition 5 min under way the motor bogged to where full throttle is half what it was. Starting now is also sluggish. Tried new fuel, plugs look OK, fuel filter flushed out and still reduced pwr. Can you tell me the year of both and what's possibly up with the Merc? Thanks!<br />jondspen (Beginner Boater)

 

[Peter O]

Re: Need year on two 40 h.p. and also power dropped on the Merc

the merc is a 1980. need a model # for the johnson to determine year.

 

[jondspen]

Re: Need year on two 40 h.p. and also power dropped on the Merc

Thanks! I look over the Johnson again and still cound find no id plate. Guess I'll have to take to a mechanic. Also, can you explain the sudden drop in power I encountered while under way? Like I said, one second the Merc was running fine, next it dropped power. Both plugs are firing. Thanks for your assistance! Have a safe and happy summer!<br />Jon

 

[Dsmald]

Re: Need year on two 40 h.p. and also power dropped on the Merc

John:<br />OMC stamped the year on a soft plug on a 15 hp I had- I don't know how long this has been done, take a look--<br />Darren

 

[Billy Bob]

Re: Need year on two 40 h.p. and also power dropped on the Merc

Hi There<br /><br />I have one of those Johnson's. The numbers on mine were on a plate on top of the 'transom mount'<br />The motor has to be turned to one side and lowered to be able to see it.<br /><br />Billy Bob