15 hp Mariner

[Jack Spratt]

Which plugs and what gap should I use in a 15 horse 1990 Mariner?
Unable to locate a specific manual. Unknown history on the motor.
Compression is 125 and 130 and motor seems to run strong, but smokes a bit when trolling.

 

[Dunaruna]

Re: 15 hp Mariner

There are a few different plug listings. Need the model number.

 

[Jack Spratt]

Re: 15 hp Mariner

The serial # is OC131054. Tiller, manual start, long shaft. I will look at the id plate tomorrow to see if there is any more info.
Thanks for the help.