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Hi Allan:
Had a Google moment and found the following site.
http://board.moparts.org/ubbthreads/showflat.php?Number=4580509

This is info found there.
Only difference between an rc12yc and an rn12yc is the hex size. c= 5/8. n=13/16.
Hope this helps.

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NGK Pro-V Spark Plug BKR5E (RC12YC) fits Champion, NGK and Autolite.
EITHER RC12YC or RC14YC will work. But for best results use NGK BKR5E or BKR6E. They last longer and are less prone to fouling. Helpful?
Champion RC12YC Spark Plug, 0.032 to 0.038 in Fill Gap, 0.551 in Thread, 5/8 in Hex, Copper, For: 4-Cycle Engines.
Autolite 3923-3926 (maybe more) are listed as equivalent to the Champion and NGK. I had the the exact same Champion RC12YC in my supercharged 360 (Dakota) and then switched to the Autolite 3923 which have a cooler heat range for boosted or sprayed motors. Using that same plug for 10 plus years.
Misfiring due to excessive heat, quenching, increased fuel consumption and even engine failure can occur from the use of incorrect or mismatched spark plugs, so it`s best to replace all of your spark plugs at the same time, and with the correct type of spark plug, to ensure smooth and consistent operation.
The engine won`t know the difference. All spark plug manufacturers cross-reference their plugs with other brands so their brand can be interchanged with other brands. For most applications, there are usually a variety of brands that are interchangeable.
A: The difference between the RC12Y and the RC12YC is simply the core material. The “C” on the end merely means that it has a copper core. It will work just fine in your B&S engine.
C = hex size 5/8″ K = hex size 5/8 with projected tip (ISO) M = compact type P = projected insulator type R = resistor SD = surface discharge for rotary engines U = semi-surface discharge Z = inductive suppressor.

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God bless you

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Take the fresh cover of cigarette rolling papers for lack of a feeler gauge that helps good enough.

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My name is June Strandberg, and I am a florist and gardener in San Francisco. I have been working in the industry for five years, and I love helping people find the perfect floral arrangement for their special occasions. I am also skilled in troubleshooting and fixing gardening tools, so if you are ever having trouble with your tools, please don't hesitate to reach out to me.