Got a couple of Questions on a Mid 70's 115hp Jonny

[PACERll]

Gotta a mid 70's 115hp jonny (the flat back design) that has a few problems. When I first bought it it would fire up as soon as I hit the key no problems at all. Put it in the water and as soon as I stab the trhottle it would just bog down without no raise in rpm's. It did start to jump on plane 1 time and that was it. Took it home started diagnosing aand found a couple off problems. Bottom carb was loose. Repaired it along with new gaskets and then I uncovered another problem the ends of the spark plug wires where shot. So now I am looking for a set of coils (all four). If any one has these please email me as I want to finish the restoration on this boat. But my main question is with the bottom carb being loose while I was checking it out for the first time is it possible that I may have caused any internal damage? Any help will be greatly appreciated. Thanks again for a GREAT site.<br /> 1FASTLASER

 

[WillyBWright]

Re: Got a couple of Questions on a Mid 70's 115hp Jonny

That cylinder would've been running lean. I'd do a compression check. If that cylinder is within 10% of the others, it's fine. I wouldn't be too concerned about your short run with the carb loose, but how long was it loose up to that point?

 

[OBJ]

Re: Got a couple of Questions on a Mid 70's 115hp Jonny

You can get coils at your local John/Rude dealer. Don't mess with used. Can ya' post a model number so we can find out what year we are dealing with?

 

[Joe Reeves]

Re: Got a couple of Questions on a Mid 70's 115hp Jonny

A Coil purchase is not necessary due to a faulty plug wire if you have the type coils whereas the wire leads to the inside of the coil.<br /><br />The wire unscrews from a threaded terminal that exists within the coil. Unscrew it and install a new one which you can make up yourself.<br /><br />As OBJ states/indicates.... OMC made a lot of engines in the 1970's, and there were differences, hence the model number is needed to pinpoint the year etc.<br /><br />The bogging problem is usually due to fouled carburetors or/and a sticking timer base under the flywheel.

 

[redmopar]

Re: Got a couple of Questions on a Mid 70's 115hp Jonny

Had a similar problem with my '79. Turned out to be a weak fuel pump diaphragm.

 

[PACERll]

Re: Got a couple of Questions on a Mid 70's 115hp Jonny

If I can get home from work today at a decent hour I will post the model number this evening or first thing in the morning. Have a Great Day ya'll.<br /><br /> 1FASTLASER