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Old 09-11-2020, 08:30 AM
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Raul G Raul G is offline
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Spark plug gap

On the Mudbuddy site they recommend plug gap at .035". I have always set it at .030 whether the 18, 25, or 27 hp Briggs or Kohler motors. The also recommend Autolite AP 3923 plugs to replace Champion RC12YC. Any thoughts?
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Old 09-11-2020, 11:26 AM
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Re: Spark plug gap

I think Autolites are better plugs. Just my preference though. As far as the gap... if you like .030 go for it if it's working.
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Old 09-11-2020, 01:12 PM
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Re: Spark plug gap

Thanks! Since i needed extra i bought a pair of the Autolite. Both briggs and kohler recommend .030. Just bought a new Champion 3600w generator and the manual sets a range of .024- .031" which is confusing, took out the plug and it was set at .025. Wonder why mudbuddy recommends .035 on their line?
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Old 09-14-2020, 12:53 PM
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Re: Spark plug gap

Technically the larger the gap the more the atomized mixture is ignited in that microsecond. Problem with the larger gap is more voltage is needed to jump the larger gap and some coils can't "empty & fill up properly" in the quick intervals at your higher RPMs so there is some "clipping of the spark" and it isn't as large and as "hot" as it should be. When racing motocross we would go with the largest gap we could and not have the clipping. Heat range of the plug is extremely important also if you are running pretty much WOT all the time and in the extreme heats we are experiencing...then throw in this sh - tty fuel and pre-ignition and detonation COULD occur and this isn't good on your piston crown.......Basically go with what works for you.....
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Old 09-14-2020, 03:53 PM
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Re: Spark plug gap

Great explanation Billy! Well done!
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Old 09-14-2020, 04:10 PM
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Re: Spark plug gap

Thorough exegesis! Not being much of a gambler, and since the 30-06 bullet has been consistent for me, i will stick with the .030" gap. After getting a molar extraction last week, motor and driver are properly gapped! Put in a fresh pair of Autolites.
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