spark plugs

[jasperpso]

I recently got the service manual for my 1987 Force/Chrysler 50 hp outboard. after looking through the ignition system section, i noticed that the plugs i am using (they were already in the motor when i got it) were not the correct type. after closer inspection, i found that they were the correct plug for the smaller 15hp force motor. I am going to replace them with the correct size, my question is, do you think this will make a noticeable difference in power? how much variance is there in spark plug spark? thanks for any and all help<br /><br />jason

 

[Spidybot]

Re: spark plugs

Right plugs are important for stability, performance, fuel consumption, efficiency, startability, idle, top end and more.<br /><br />The ones you have may or may not differ very much from the ones recommended.<br /><br />Sparkplugs are different and often made to the exact use. Those designed for modern hi-tech ignition systems won't even make the smallest spark on an old motor if the working power is way off the rated amount. Some systems runs 10-20.000 volt, others run 50-60.000 volts, some has built-in radio interference restriction and other does not. The plugs serves as ignitor for the air/fuel mix but even leads heat away. The electrode design varies and is often made in a way ensure long life and good ability to stay clean during service.<br /><br />Add to this that mechanical differences includes more thread sizes.<br /><br />Not knowing the scientifics of the two, you are the one to tell if it makes any changes in your case, once you replace them.