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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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	#3,516 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 2,876 Reviews
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

A**R

Works great

This was just what I needed for my John Deere lawnmower

27.04.2026

D**P

Spark plug for Lawnmower

Easy to install the perfect price for 2, and very nice brand. Would buy again any time

8.04.2026

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

D**D

No complaints

These worked out great. I have only used one so far and it seems compatible and sturdy . I had to replace a worn out on that was in my TORO mower and so far so good.

17.03.2026

H**1

Spark plugs, just expensive!

They make spark as all spark plugs do!

5.05.2026

A**H

Briggs Stratton the real Plug

Work just fine had to set them but you do all of them could be preset but these travel before they get to you.

16.02.2026

J**Y

Satisfied!!!

Satisfied!!

14.04.2026

A**R

B&S Plugs no other will do Great Price!

Price Great B&S should be no other!!

29.04.2026

B**.

Excellent product

Perfect poem spark plug for a Husqvarna tractor.

30.09.2025

1**S

Greak plugs.

Worked great on my lawn tractor.

22.02.2025

A**R

Factory spark plugs !

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

30.05.2024

S**Y

great fit on my la145

installed good. shipping was good. however the packaging the seller put it in could of caused damage. no protection for the electrodes.

13.05.2024

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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2 weeks ago

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SAR 38

Duties & taxes included

In stock

Sold byAmazon KSADelivered 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 KSA.

Secure transaction

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Fast, free shipping, member pricing & priority support.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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