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 General Sailing Forum
 Is there a preferred Sparkplug?		  New Topic  Topic Locked
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Ben
Master Marine Consultant

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USA
1234 Posts
Initially Posted - 04/01/2005 :  16:20:34  Show Profile
Hi folks,

Not being very knowledgeable about many things, I turn to the experts; YOU. Anyway, I'm going to put in a new sparkplug on my 86 or 87 Johnson Sailmaster. Is there a better sparkplug to buy for our application?

Thanks ya'll.
Ben
Beneteau 361
Viking Kitty
Columbus, Ohio
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 04/01/2005 :  18:06:09  Show Profile
I've had really good luck with NGK sparkplugs in 2 strokes.
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Ben
Master Marine Consultant

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USA
1234 Posts
Response Posted - 04/02/2005 :  11:28:12  Show Profile
Thanks for the tip, CB. Actually, I have two NGK's in my engine right now, so whoever installed them in the first place must agree with you.

One question though, the manual, the specifications call for a QL77JCA (or L77JCA) plug. What is in my engine now are two BR7HS plugs. Could this have been a problem for me and I not know it? Could this also have been why my electric start would have intermittent failures?

Thanks again,
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Leon Sisson
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1893 Posts
Response Posted - 04/02/2005 :  13:34:48  Show Profile  Visit Leon Sisson's Homepage
Ben,<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">the manual, the specifications call for ... What is in my engine now are...<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">Different brands use different numbers to describe sparkplugs that are equivalent. Cross reference charts exist. Also, from time to time, sparkplug makers will retire numbers and introduce "new and improved" versions with different numbers, thus making old parts books and recommendation charts less useful. You might want to jot down the various brands and numbers that are recommended for your motor in the margins of the appropriate section of your factory shop manual. Although I prefer NGK plugs, there's probably nothing wrong with Champions, Bosh, Nippon Denso, or many other popular brands.

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Could this also have been why my electric start would have intermittent failures?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">Sparkplugs are often blamed for problems they have no affect on. (Probably because they're cheap and easy to replace.) On a magneto fired engine, there's no connection between the electric starter and plugs other than cranking speed. Under no circumstances can bad plugs affect the behavior of an electric starter (other than wearing down the battery while not firing ). On the other hand, if the starter is spinning the crankshaft fast enough to fire, but the motor isn't starting, then you can suspect the ignition system (along with several other engine systems).

-- Leon Sisson
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Ben
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USA
1234 Posts
Response Posted - 04/02/2005 :  15:30:04  Show Profile
Thanks Leon.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.