Best Spark Plug for 72 Johnson 125HP

[LOSTBOATER72]

HELP!

I current am using Champion L77JC4 plugs in my engine and I seem to be having an overheating issue. Spray comes from the correct areas but it overheats quite quickly. I have used Splitfire SF263D plugs in the past but that was when I had another issue of a broken piston ring and that has since been replaced. Any suggestions as to the best plug for this motor.

Thank you,
Lost Boater 72

 

[tashasdaddy]

Re: Best Spark Plug for 72 Johnson 125HP

QL77JC4 or L77JC4 gapped at .030. overheated could be failing thermostat or stats. just because you have water circulation does not mean the tstats are opening and cooling the block.

 

[kenmyfam]

Re: Best Spark Plug for 72 Johnson 125HP

Champion plugs without a doubt. Have you checked the head temperature accurately ??? if not how do you know it is overheating ??
Is it a spray or a stream of water coming out ??
When was the water pump last serviced ???
Stat's as already stated as well need to be checked and replaced if necessary.