spark plugs

[Wreck Rider]

My Johnson V4 (85 hp, model 85ESL75) outboard sounded like it was missing and lost power so my buddy and I did the only thing we knew how to do, change the spark plugs. Now its running great but I still don't know if these plugs are right because... the manual I have quotes a champion # L77J4 but all I could find was L77JC4 and the manual doesn't say what the gap should be.<br /><br />Does anyone know if these plugs are OK?<br />Do they come pre-gapped?<br />What is the gap supposed to be?<br /><br />Thanks in advance.

 

[rickdb1boat]

Re: spark plugs

wreck rider <br />The Johnson chart shows:<br /><br />L77JC4 or QL77JC4(Resistor) Plug gapped @ .030 They are not pre-gapped. You need to make sure it is correct. I would use the QL77JC4 plug, as it is a resistor plug that will cut down on interference through your boat radio and other electronics you may have.

 

[Wreck Rider]

Re: spark plugs

Thanks for that info Rick, its great to be able to ask someone who knows.

 

[walleyehed]

Re: spark plugs

Gap to .040 if you do much trolling or idling...

 

[DBLD]

Re: spark plugs

Is it OK to use the L77JC4 instead of the Q . . .<br /><br />I think I had the Q-version in my motor, but I was in a bind a few weeks back and needed new plugs right away and I could only find the L77JC4 at the store - they didn't have the Q-version. <br /><br />Can I keep using these or how will it harm my motor?

 

[93bronco]

Re: spark plugs

the original gap recommended for L77J4 installed on your motor was .040 .

 

[walleyehed]

Re: spark plugs

Thank you, 2K Boat....It was also an OMC service bulliten.<br /> Hey guys, the only thing the Q means is resister for non-interferance with things like radios, depthfinders......absolutely no reason to worry, using either plug.........

 

[walleyehed]

Re: spark plugs

BTW, the "C" is the electrode material.....K