spark plugs and outboard - Pensacola Fishing Forum

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Old 08-04-2015, 03:01 PM   #1
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Default spark plugs and outboard

How much do sparkplugs affect outboard performance? might be a silly question but is it like a car motor, if one is bad the motor runs like crap? My 115 Yamaha runs good but just wondered what affect it would have if I changed them out-

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Old 08-04-2015, 03:42 PM   #2
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Usually the motor will run bad because of some sort of carb issue.
I've never had a outboard start running good again just from changing the plugs. Been there done that. And replaced filters.
For me it always is a carb issue if my engines aren't running perfect .
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Old 08-04-2015, 07:49 PM   #3
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Is it a 2 stroke? If so, a can of Merc/Quicksliver Power Tune will not hurt it plus new plugs.

I had an '00 Yam 150. Idle was a tad high and plugs were 'ok'. Long story short, after that and a new set of plugs, idle was lower and much more consistent overall.

Plugs are cheap and can help.
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Old 08-04-2015, 09:21 PM   #4
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Yes, plugs make a big difference, 1 cylinder down on a v6 will cost you about 400 rpm. You can check plugs with an ohm meter before you ever pull them out. Look for no reading at all .
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Old 08-04-2015, 09:40 PM   #5
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I change them yearly in my yamaha 2 stroke and keep a spair set in the boat

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Old 08-04-2015, 10:05 PM   #6
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Funny, I just changed my plugs out this weekend and was surprised how much difference they made. Much easier to start and both engines purred. The old plugs were only a season old. I have old 2 strokes though. Not sure if it would have a major impact on newer direct fuel injected motors. I equate it to old cars vs new cars. My old 69 firebird will eat plugs like nothing. my 2001 expedition will go 100k before I even think about it.
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