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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491055S - 2 Pack

Product ID: 13521976

Details

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

🌿Optimized for lawn mowers

🔥Reliable ignition spark

⚙️OEM precision fit

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Rp275601

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Description

⚡ Ignite your mower’s potential with every start!

DUAL PACK VALUE - Two spark plugs in one bulk pack—double the readiness, zero downtime.
TOP RATED RELIABILITY - 4.7-star rating from over 2,800 users proves this is the spark plug pros trust.
COPPER CORE TECHNOLOGY - Enhanced conductivity ensures a powerful, consistent spark every time you start up.
GENUINE OEM REPLACEMENT - Engineered by Briggs & Stratton for flawless compatibility and peak performance.
UNIVERSAL LAWN MOWER FIT - Compatible with a vast range of Kohler and Briggs & Stratton engines—your go-to spark solution.

The Briggs & Stratton 491055S 2-pack spark plugs are genuine OEM parts designed for optimal ignition performance in a wide range of lawn mower engines. Featuring copper core technology and a precise fit, these spark plugs ensure reliable starts and efficient engine operation, backed by a 4.7-star rating from thousands of satisfied customers.

Specifications

ASIN	B00GG1BVOQ
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#3,680 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #3 in Lawn Mower Spark Plugs
Brand	Briggs & Stratton
Brand Name	Briggs & Stratton
Compatible with Vehicle Type	Lawn Mower
Core Material	Copper
Customer Reviews	4.7 out of 5 stars 2,907 Reviews
Item Weight	0.19 Pounds
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	2.0 Count
Vehicle Service Type	Lawn Mower

Reviews

F**O

Good quality, good price, perfect size

Works pretty good on my push mower, I changed the last spark plugs Briggs and Stratton they long last for around 3 years, I'm pretty sure this one's gonna reach many years...

12.05.2026

C**R

Fits Craftsman 19.5HP riding mower.

Fits Craftsman 19.5HP riding mower. Works great! Engine starts up right away at a good price!

1.06.2026

D**R

Spark plug replacement for power washer

Worked perfectly in my Troy Built power washer with Briggs and Stratton engine.

18.05.2026

B**.

Good plugs

They came very quick , and fit Dylan mower fine .

8.05.2026

J**5

All Is Good

25.05.2026

S**L

Received on time, installed worked great

10.05.2026

T**R

If you want your mower to last, take care of it

I had 2 mowers to tune up that took these spark plugs. Great price, and oem plugs to boot. Thanks!

20.04.2026

B**H

Quality parts

Perfect fit

14.05.2026

S**N

Good 👍

Good

30.05.2026

1**S

Greak plugs.

Worked great on my lawn tractor.

22.02.2025

B**.

Excellent product

Perfect poem spark plug for a Husqvarna tractor.

30.09.2025

A**R

Factory spark plugs !

Work well , factory spark plugs . Alway get them for great performance.

30.05.2024

S**A

They work good

They seem to be good quality and shipping was good also

26.05.2025

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TrustScore 4.5 | 7,300+ reviews

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3 days ago

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