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      Members Only Fluid Forum View   08/08/2017

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hitthebricks

Spark Plugs

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hitthebricks

I have a 2001 Merc Optimax, 200 hp and I'm wondering how often I need to change the plugs. The motor still runs and starts great and the plugs cost over a $100. I do all the other maintenance but I keep skipping the plugs. Any first hand knowledge or professional advice would help. Thanks HTB

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marine_man

I would say as long as your motor is still running great you're in good shape...

marine_man

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Valv

You might want to check with other dealers or sources, plugs for an Opti were around $ 15.00 each, but should be a little better now.

For your motor should be around $ 70.00 $ 80.00

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Ufatz

I would sure like to hear a RATIONAL explanation of why a spark plug has to cost $15! I mean other than the fact that the manufacturer thinks he can get away with that sort of pricing? C'mon you guys......$15 for ONE spark plug. Do you get a kiss with that? HA?

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cold one sd

Plugs for the new Verado run 18 bucks.

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Valv

Quote:

I would sure like to hear a RATIONAL explanation of why a spark plug has to cost $15! I mean other than the fact that the manufacturer thinks he can get away with that sort of pricing? C'mon you guys......$15 for ONE spark plug. Do you get a kiss with that? HA?


There is not rational explanation, many mfg have specific plugs for their engines and you will pay trough the roof for them. I agree it's a rip-off, but there's no way out....

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hitthebricks

I did decide to change the plugs this year instead of finding out mid-week on Rainy. Guess what, $21.95 ea. x 6 plus tax = $130. Glad I don't need to do it every year. After I'm done I'll stick those old plugs in a bank vault cause they must be GOLD or maybe its just FOOLS GOLD, butt either way thay didn't use any grease. HTB

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Capt. Don*

My boat has twin 225 Optis, I run 200-300 hours a season. Merc recommends plugs every 100 hours, I get far more than that, I'll pull them and check them every 100 hours and if ok I replace them at the start of the season.

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hitthebricks

when you pull them out what do you look for? HTB

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ChemE

Look at the amount of carbon build up and the gap between the trodes. Too much carbon will inhibit spark formation as will the gap being out of spec.

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hitthebricks

There was a lot carbon buildup and one plug had a cracked insulator, so I guess it was time to change plugs. HTB

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