1992 Johnson 90-HP V4 Spark Plugs - Moderated Discussion Areas

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Author Topic:   1992 Johnson 90-HP V4 Spark Plugs

jpdemarco posted 08-29-2014 08:32 PM ET (US)
I have a 1992 Montauk with a 1992 90 hp V4 Johnson outboard. I have problems with plugs fouling easily. My mechanic has NGK BZ7HS-10 plugs installed. Should we be using a different plug? Thanks for any help.
jimh posted 08-31-2014 12:01 AM ET (US)
Find your engine on the information listed in the REFERENCE section at
http://continuouswave.com/whaler/reference/BRP/SparkPlugChart2008.pdf
Use the spark plug recommended in this document from the manufacturer of your engine.
As I read it, the 1992 90-HP uses QL77JC4 or QL82C. On ALL VRO/OMS equipped motors the "QL" supressor plug is recommended.
I don't understand why so many people in the USA think that the best spark plug to use is now some Japanese brand of spark plug. OMC engines always use Champion spark plugs.
seahorse posted 08-31-2014 01:08 AM ET (US)
The Z series NGK plugs usually cost quite a bit more than the recommended Champion plugs.
The QL82C is the one to use is you have fouling problems. Also check your thermostats as they may not be warming up the motor enough at slow speeds to prevent fouling.
contender posted 08-31-2014 03:34 PM ET (US)
used Only AC plugs or next choice would be Champion, (AC = Arthur Champion) I have found the best are the AC for some reason....

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Author	Topic: 1992 Johnson 90-HP V4 Spark Plugs
jpdemarco	posted 08-29-2014 08:32 PM ET (US) I have a 1992 Montauk with a 1992 90 hp V4 Johnson outboard. I have problems with plugs fouling easily. My mechanic has NGK BZ7HS-10 plugs installed. Should we be using a different plug? Thanks for any help.
jimh	posted 08-31-2014 12:01 AM ET (US) Find your engine on the information listed in the REFERENCE section at http://continuouswave.com/whaler/reference/BRP/SparkPlugChart2008.pdf Use the spark plug recommended in this document from the manufacturer of your engine. As I read it, the 1992 90-HP uses QL77JC4 or QL82C. On ALL VRO/OMS equipped motors the "QL" supressor plug is recommended. I don't understand why so many people in the USA think that the best spark plug to use is now some Japanese brand of spark plug. OMC engines always use Champion spark plugs.
seahorse	posted 08-31-2014 01:08 AM ET (US) The Z series NGK plugs usually cost quite a bit more than the recommended Champion plugs. The QL82C is the one to use is you have fouling problems. Also check your thermostats as they may not be warming up the motor enough at slow speeds to prevent fouling.
contender	posted 08-31-2014 03:34 PM ET (US) used Only AC plugs or next choice would be Champion, (AC = Arthur Champion) I have found the best are the AC for some reason....