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.

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

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

🔥Copper core for durability

🔧OEM precision fit

R$120

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

Description

⚡ Ignite your engine’s potential with every start!

RELIABLE DUAL PACK - Two spark plugs for uninterrupted power
WIDE COMPATIBILITY - Fits a broad range of Kohler and Briggs & Stratton engines
OEM CERTIFIED QUALITY - Genuine Briggs & Stratton replacement ensures perfect compatibility
TOP RATED PERFORMANCE - 4.7-star rating from nearly 3,000 users proves trusted reliability
COPPER CORE EFFICIENCY - Superior conductivity for consistent engine starts

The Briggs & Stratton 491055-2pk Spark Plug set offers genuine OEM quality with copper core construction for enhanced durability and ignition efficiency. Designed for a wide range of Kohler and Briggs & Stratton lawn mower engines, this dual pack ensures reliable performance and easy replacement, backed by a 4.7-star rating from thousands of satisfied customers.

Specifications

ASIN	B00GG1BVOQ
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,613 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 (2,982)
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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

R$120

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

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

View all Trustpilot reviews