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Slabmaster
Spark plugs?
I'm a noob mechanic 😑 And am trying to educate myself to do my own limited work on my 1996 Johnson 150 FS. Been having issues lately and noticed among other things that my spark plugs need replaced. Does it matter which ones I buy? Couldn't find a good guide on the subject
Crappie.com Legend
Go to a marine mechanic and talk to him! That way you know whats best! Or Marine Engine Repair, New Boats, Used Boats, Boat Parts - themarinedoctor.com
Trophy King
Hello: You have to get spark plugs specific to your motor. Download a manual for your motor and It will tell you .Also you can go to an auto parts store with your motor information and they should be able to help you. I get my spark plugs at Oreillys. Good Luck . O - R
Slabmaster
Thanks for the reply! Where can I download a manual? That would be incredibly helpful!Originally Posted by outdoorsron
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Crappie Wall Hanger
Fast strike ignition system was designed and built to run on QL78YC spark plugs, you want the best performance run them, anything else, yeah I know they are very expensive, you may not get the best out of it. Early Fast Strike motors came with QL77JC4 but later it was recommended to go to the first plug listed. Running hotter plugs is asking for trouble as the combustion chamber is on the verge of melt down at any given time, throw in a couple extra hundred degrees and you may wind up needing pistons. Just say NO to splitfires
Last edited by CrappiePappy; 03-24-2017 at 02:38 PM.
Tom
"The reason I play Golf.....there are no broke down boats on a Golf Course"
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Slabmaster
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A friend of mine who is the service manager at one of the big marinas out at the beach says he loves the splitfire plugs. They give his mechanics at lot more major work. Personally I have always prefered NGK but the book does call for Champion for that motor.
Crappie Wall Hanger II
NGK is by far a better plug in most any case. But as already said, that ignition system was designed around a champion plug and that is one of the first things mentioned when troubleshooting that ignition system.
I'd rather be fishing.
Slabmaster
Should my spark plugs and area you screw it into have oil residue? It's a pretty good amount...
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Crappie Wall Hanger
Those don't look bad at all, oil residue on the threads I have found that comes from idling around a lot, two stoke motors kind of like being run......hard , to help keep excess oil from fouling out plugs, if it where me I'd clean them with carb cleaner and run them. When plugs go bad you will see a step on the j part of the plug and the center electrode will look rounded off. Run good gas, good oil and every so often, drive it like you stole it to keep the moving parts clean
Tom
"The reason I play Golf.....there are no broke down boats on a Golf Course"
