Have a 2012 troybuilt riding mower with a 17.5 hp engine. what spark plug does it take?

you need model # of mower and type of engine, ie: Kohler, Braggs, Honda, etc

Does this replace rc12yc?

No the thread portion is to long

Will this fit a john deer js40 self propelled walk behind mower?

Yes, I think the B&S 491055S will fit the John Deere JS40 mower. The John Deere part number for the JS40 spark plug is M78543 (JD Model JS40 maintenance sheet). I found 4 replacement plugs for the M78543 spark plug from a cross-reference website: Brisk 1326, Brisk DR17YC, Champion 71, and Champion RC12YC. It is important to measure the length of the threads on the original spark plug and compare it to the new or replacement plug. If the threads are too long you run the risk of the piston impacting the bottom of the spark plug; ruining your engine. I've used the Champion RC12YC on my JD E100 riding mower that has a B&S engine with the B&S 491055S spark plug. The Champion RC12YC is one of the replacement spark plugs for the 491055S.

Are these spark plugs b&s plugs or off brand plugs? thank you be safe out there

Hi they are briggs and Stratton brand.

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⚡ Spark your engine’s potential — don’t get left in the cold!

BUILT TO LAST - Crafted with premium materials to withstand tough engine conditions and extend spark plug life.
TWO PACK VALUE - Double up with this convenient 2-pack—never get caught without a spare when you need it most.
IGNITE WITH CONFIDENCE - Engineered for consistent, reliable spark delivery to keep your equipment running smoothly.
LIGHTWEIGHT POWERHOUSE - At just 82g, it’s designed for easy handling without compromising durability.
UNIVERSAL FIT ZERO HASSLE - Compatible with a vast range of Briggs & Stratton models, eliminating guesswork in replacements.

The Briggs & Stratton 491055-2pk Spark Plug set offers reliable ignition performance with broad compatibility across numerous Briggs & Stratton engine models. Lightweight and durable, these spark plugs ensure efficient engine starts and long-lasting operation, packaged conveniently in a two-pack for added value and peace of mind.

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Manufacturer	Briggs & Stratton
Brand	Briggs and Stratton
Product Dimensions	10.16 x 2.54 x 2.54 cm; 82 g
Item model number	491055S
Manufacturer Part Number	491055
Item Weight	82 g

Briggs & Stratton 491055-2pk Spark Plug (2 Pack) Replaces 805015/72347/491055/Champion RC12Y

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