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 Hotter Plugs?		  New Topic  Topic Locked
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wmuchmore
1st Mate

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USA
56 Posts
Initially Posted - 07/27/2005 :  20:37:58  Show Profile
Greetings all,

Like many of us I guess, my outboard, a Johnson 9.9, gets very little high speed use. It runs at low speed just getting back and forth to the dock. Obviously this contributes to plug fouling, so I was wondering if it would be advisable to use a hotter range spark plug, assuming one is available. The Johnson manual calls for Champion QL77JC4, which I am using. Has anyone experimented with hotter plugs to reduce plug fouling?

Mike M, #2083, TRFK
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 07/27/2005 :  22:50:26  Show Profile
How often are your spark plugs needing to be cleaned or otherwise fouling out?

Couple thoughts.

I've had better luck with NGK plugs in 2 strokes. Might consider going to a high-quality fully synthetic 2 stroke oil too.

Also doesn't hurt to take the boat on a little 'motoring' cruise now and then so you can work the engine a bit and burn off some carbon. Just pretend it's a Mac 26M.
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thaind
Navigator

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Canada
145 Posts
Response Posted - 07/27/2005 :  23:08:44  Show Profile
Are your fouled plugs black or white? I would suggest next time you change one take it to an outboard mechanic.
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Ben
Master Marine Consultant

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USA
1234 Posts
Response Posted - 07/28/2005 :  07:17:47  Show Profile
Mike M,

I had the same problem with my Johnson 9.9 sailmaster. After I dropped the sails and as I was motoring into the channel (before I got to the no-wake zone) I would run the engine at full throttle, or close to it, until the dark exhaust (carbon) was blown out. That way I could be reasonably sure that the engine wouldn't die on my as I was slowly motoring to my slip.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 07/28/2005 :  09:33:40  Show Profile
My old 79' 9.9hp Johnson ran like a champ even though when I got it, it had the original 16 year old factory plugs in it!
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wmuchmore
1st Mate

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USA
56 Posts
Response Posted - 07/28/2005 :  22:06:58  Show Profile
Thanks to all for the good comments and suggestions. As usual this forum is a great source of help and advice.
Mike M, 2083
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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.