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

⚡High-performance ignition

🌿Optimized for lawn mowers

🔧OEM precision fit

R334

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Description

⚡ Ignite your mower’s potential with every spark!

EASY INSTALLATION - Bulk packed and ready to install with clear part number guidance
RELIABLE DUAL PACK - Two genuine Briggs & Stratton spark plugs for uninterrupted power
WIDE COMPATIBILITY - Fits a broad range of Kohler and Briggs & Stratton engines—never worry about fit
COPPER CORE TECHNOLOGY - Enhanced conductivity for efficient ignition and longer engine life
PRECISION OEM REPLACEMENT - Exact fit for seamless engine compatibility and peak performance

This 2-pack of genuine Briggs & Stratton 491055 spark plugs delivers reliable, OEM-quality ignition performance specifically engineered for lawn mowers. Featuring copper core technology and broad compatibility with Kohler and Briggs & Stratton engines, these plugs ensure efficient starts and sustained power. Perfect for professionals and enthusiasts seeking hassle-free installation and consistent engine reliability.

Specifications

ASIN	B00GG1BVOQ
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#5,955 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 (3,042)
Included Components	No
Item Weight	3.04 ounces
Manufacturer	Briggs and Stratton
Manufacturer Part Number	491055
Model Number	491055S
Number of Items	2
OEM Equivalent Part Number	491055
Thread Size	491055
Top Material Type	Metal
UPC	704660036378
Unit Count	2 Count

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R334

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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