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Author Topic:   Champion QL77JC4 to NGK Spark Plugs
bendory15 posted 09-12-2011 07:15 AM ET (US)   Profile for bendory15   Send Email to bendory15  
Hi everyone, I have 1996 Johnson 30-HP two-cycle outboard engine. For years it had CHAMPION QL77JC4 spark plugs. Can I replace them with adequate NGK spark plugs, I think BZ7HS-10? Or, is [the NGK plug] not recommended? [Will] there will be differences in performance? Thanks for replies.
jimh posted 09-12-2011 09:34 AM ET (US)     Profile for jimh  Send Email to jimh     
You can find the factory recommendation at

They do not mention the NGK plug.

Tohsgib posted 09-12-2011 11:32 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
Over the years I have had 2 things that love Champion plugs, the rest were nightmares....OMC engines and lawnmowers.
contender posted 09-12-2011 01:37 PM ET (US)     Profile for contender  Send Email to contender     
Ben: the best plugs that I have found for OMC's are the A/C plugs hands down... NGK plugs are for Yamaha's. FoMoCo/auto-lite plugs are crap. Champions I ran in the race boat but they were race plugs in a big block Chevy.....Food for thought A/C stands for Albert Champion
tedious posted 09-12-2011 03:11 PM ET (US)     Profile for tedious  Send Email to tedious     
Why are you interested in going with something different? That Champion plug has been used forever in those OMCs, and is available worldwide at a reasonable price.


jimh posted 09-12-2011 08:19 PM ET (US)     Profile for jimh  Send Email to jimh     
I wonder if some people are sucked into the NGK spark plugs because they are made in Asia. A lot of younger people automatically think if something automotive is made in Asia it must be better than something made in the USA. It is a mindset I see prevalent in younger people.
macfam posted 09-12-2011 08:24 PM ET (US)     Profile for macfam  Send Email to macfam     
If it's's Champion. Period.
Jeff posted 09-12-2011 11:53 PM ET (US)     Profile for Jeff  Send Email to Jeff     

With the statement of "some people being sucked in because they are made in Asia.", I believe you are missing the point about NGK plugs and some peoples desire to run them in Two Stroke outboards. It's not about one's age and conceptions about Japanese engineered and produced products. I believe it is from the long winning history NGK has in Two Stroke motorcycle world. Of course many of those motorcycles were Japanese made. That said, I was raised by a father who worked for General Motors, in their engineering and design staff for his career. He was as buy American Products as it could but, when I was growing up but, he always taught me, if you want the best plugs for your Two Stroke you should run NGK.

Back to OMC outboards, I exclusively ran NGK surface gap plugs in all of our Mercury motors for years. They are easy to pull and clean without ever having to worry about gap / regapping. With my first OMC (235hp crossflow V6) I ran the same NGK surface gap plugs for my entire ownership and never once had a problem.

I have not found a NGK surface gap plug to run in my 1974 Evinrude 85hp V4 but, am currently the standard NGK's for this season instead of the Champion plugs. I have noticed that start up and idle during warm up with my old V4 was better with the Champion Plugs vs the NKG's. Because of this I will likely go back the Champion plugs next year. This truly get me because I have a very strong aversion to using Champion products due to two failures of their product, one that put us in a high risk situation while on the water.

bendory15 posted 09-13-2011 07:32 AM ET (US)     Profile for bendory15  Send Email to bendory15     
No particular reason why am I thinking about NGK... just there is a store with NGK spark plugs near my place. The salesman sad that there will be no difference in performance. Btw, this NGK spark plugs are made in France!
I`m just curious what other people think.
thegage posted 09-14-2011 10:02 AM ET (US)     Profile for thegage  Send Email to thegage     
Champion website states:

"Outboard marine Capacitive Discharge Ignition systems (CDI) such as used on some Johnson and Evinrude marine engines require a special inductive type resistor spark plug (such as a Champion Q-type). This is because these type of ignitions systems produces less voltage; use of non-inductive type plugs can cause misfires and poor performance."

John K.

jimh posted 09-14-2011 10:47 PM ET (US)     Profile for jimh  Send Email to jimh     
An NGK spark plug made in France! Sacre Bleu!
seahorse posted 09-15-2011 07:11 AM ET (US)     Profile for seahorse  Send Email to seahorse     

The letter Z in the NGK sparkplug number indicates a suppressor style - not resistor style - sparkplug. Whether it has the same specs that Johnson and Evinrude require in the Champion Q style suppressor plugs is unkown.

From what I've seen in the past, the Z plugs from NGK were more expensive than the Q plugs from Champion.

If you check the official factory sparkplug chart, it shows you can use the QL82C sparkplug in place of the QL77JC4 and that one works better in older motors and ones that run low speed a lot. It is also a great plug and recommended for the venerable V-4 crossflow outboards from 1979 on up.

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