Champion spark plug L77JC4 or L82C for Johnson 9.9?

[drb111]

Sorry for the elementary questions here, but thanks for the help. According to sparkplugs.com and the champion manual at West Marine, my engine uses the L82c plug, but it currently has L77JC4 plugs in it and seems to run fine. Does it matter or should I be using 1 vs the other? Thanks again

 

[seahorse5]

Re: Champion spark plug L77JC4 or L82C for Johnson 9.9?

Don't rely on other sparkplug charts, use only the J-E factory recommendations that are kept updated. Here is a link:

http://continuouswave.com/whaler/reference/BRP/SparkPlugChart2008.pdf


You didn't mention the year but it is newer than 1977 and you can use either the QL82C or the QL77JC4 depending on the year.

 

[drb111]

Re: Champion spark plug L77JC4 or L82C for Johnson 9.9?

1984- thx seahorse...so I assume I can use either

 

[Vic.S]

Re: Champion spark plug L77JC4 or L82C for Johnson 9.9?

Just to point out that the letter "Q" indicates low resistance inductive suppression. If you do not need plugs with radio interference suppression then L82C or L77JC4 will be quite satisfactory.

What you must not use are plugs with resistive suppression, denoted by an "R", with the OMC CDI ignition system

You'll notice that the "Q" plugs are recommended for all engines with VRO/OMS systems