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

Product ID: 13521976

Details

Brand
Briggs &
Core Material
Copper
Thread Size
491055
Top Material Type
Metal
Vehicle Service Type
Lawn Mower

🌿Specifically engineered for lawn mower engines

🔧OEM precision fit for seamless replacement

⚙️Copper core for optimal conductivity

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Description

⚡ Ignite your lawn care game with unmatched spark power!

DUAL PACK VALUE - Two spark plugs included to keep your mower running smoothly without frequent reorders.
RELIABLE OEM QUALITY - Genuine Briggs & Stratton spark plugs ensure peak engine performance and durability.
PRECISION FIT GUARANTEE - Designed to perfectly replace multiple part numbers, eliminating guesswork and downtime.
TOP RATED BY PROFESSIONALS - 4.7-star rating from nearly 3,000 users proves trusted reliability in the field.
ENHANCED IGNITION EFFICIENCY - Copper core technology delivers superior conductivity for faster, cleaner starts every time.

The Briggs & Stratton 491055-2pk Spark Plug set offers genuine OEM replacement plugs with copper core technology, engineered specifically for lawn mower engines. Compatible with a wide range of Kohler and Briggs & Stratton models, these plugs ensure reliable ignition, enhanced engine efficiency, and come in a convenient two-pack. Highly rated by thousands of users, they deliver professional-grade performance to keep your outdoor equipment running at its best.

Specifications

ASIN	B00GG1BVOQ
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,955 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #3 in Lawn Mower Spark Plugs
Brand Name	Briggs & Stratton
Compatible with Vehicle Type	Lawn Mower
Core Material	Copper
Customer Reviews	4.7 4.7 out of 5 stars (2,975)
Item Weight	3.04 ounces
Manufacturer	Briggs and Stratton
Manufacturer Part Number	491055
Model Number	491055S
OEM Equivalent Part Number	491055
Thread Size	491055
Top Material Type	Metal
UPC	704660036378
Unit Count	2 Count

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R$123

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Brazil.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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