---
title: "rc12yx champion spark plug — Niche Verdict: Worth a look (57/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/rc12yx-champion-spark-plug"
last_updated: "2026-07-14T04:57:17.406Z"
locale: en
meta:
  description: "rc12yx champion spark plug shows searches that convert (19.9% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:description": "rc12yx champion spark plug shows searches that convert (19.9% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:title": "rc12yx champion spark plug — Niche Verdict: Worth a look (57/100) | Amazon United States - Flapen"
---

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# **rc12yx champion spark plug**

**Worth a look**

Shows searches that convert (19.9% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 67Growth 85Conversion 100Competition 25Returns 88Price range 79Avg price 50Brand share 11Review moat 49Quality gap 19

**Conversion**

**Incredible****19.9%**

search→purchase rate — share of searches ending in a sale

**Returns**

**Great****1.4%**

return rate — above 6% kills the launch gate

**Growth**

**Great****+83.8%**

90-day search growth — must beat 0% to launch

**Price range**

**Great****$3.91–$58.51**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Market size**

**Good****$676K**

$676K/yr · 284K searches

**Avg price**

**Good****$12.00**

avg listing price — sweet spot $15–$100

**Review moat**

**Okay****1,630.56**

avg incumbent reviews — the moat a new listing must climb

**Competition**

**Bad****71%**

top-5 click share — a locked-up shelf

**Quality gap**

**Bad****4.7★**

avg incumbent rating — lower means beatable quality

**Brand share**

**Bad****96%**

top-5 brand share — brand-locked demand

## **Competition**

The top 5 products capture 71% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**8 **▲rising

**Sellers**

**74**

**Top-5 brand share**

**96%**

**Open market**

**3%**

- Champion67% - Wetenex9% - Harbot9% - Butom8% - JSIERLUOV3% - Briggs & Stratton2% - Open — no brand owns it (2 brands, 3%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%$68K20%$135K30%$203K40%$270K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 16 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Champion Spark Plug for Craftsman (2 Pack) # 71G RC12YC-2pk](https://m.media-amazon.com/images/I/31FYhb1+-XL.jpg)**Champion Spark Plug for Craftsman (2 Pack) # 71G RC12YC-2pk**Champion**$8.65**4.7★3,614 rev](https://www.amazon.com/dp/B00FEQREMW) [2![(Pack of 2) Champion Spark Plugs for John Deere M78543 M87543 RC12YC Engine](https://m.media-amazon.com/images/I/31sAtuAWzYL.jpg)**(Pack of 2) Champion Spark Plugs for John Deere M78543 M87543 RC12YC Engine**Champion**$8.66**4.8★1,263 rev](https://www.amazon.com/dp/B08T7P3S61) [3![Wetenex RC12YC Spark Plug for Brigg 491055T 491055S 491055 692051 792015 kohler 12 132 02-S Champion RC12YC Spark Plug (2 PACK)](https://m.media-amazon.com/images/I/41LAGVTq9EL.jpg)**Wetenex RC12YC Spark Plug for Brigg 491055T 491055S 491055 692051 792015 kohler 12 132 02-S Champion RC12YC Spark Plug (2 PACK)**Wetenex**$7.73**4.6★265 rev](https://www.amazon.com/dp/B0DSVH5784) [4![GENUINE CHAMPION SPARK PLUGS - RC12YC SPARK PLUG (PREM PLUG IS 2071) 515312](https://m.media-amazon.com/images/I/31sAtuAWzYL.jpg)**GENUINE CHAMPION SPARK PLUGS - RC12YC SPARK PLUG (PREM PLUG IS 2071) 515312**Champion**$9.46**4.7★317 rev](https://www.amazon.com/dp/B008TSZPYG) [5![Harbot RC12YC Spark Plug for BS 491055 491055S 491055T 792015 692051 694385 759-3336 John Deere M78543 M87543 Kohler 12 132 02 (Pack of 2)](https://m.media-amazon.com/images/I/31VxuvRI7JL.jpg)**Harbot RC12YC Spark Plug for BS 491055 491055S 491055T 792015 692051 694385 759-3336 John Deere M78543 M87543 Kohler 12 132 02 (Pack of 2)**Harbot**$7.28**4.7★990 rev](https://www.amazon.com/dp/B07BVNX653)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![JSIERLUOV RC12YC BKR5E Spark Plugs for MTD 759-3336 Champion Briggs 491055S 692051 792015 kohler 12 132 02-S John Deere M78543 M8754 Autolite 3924 Spark Plug (4 Pack)](https://m.media-amazon.com/images/I/41xSsBvzECL.jpg)**JSIERLUOV RC12YC BKR5E Spark Plugs for MTD 759-3336 Champion Briggs 491055S 692051 792015 kohler 12 132 02-S John Deere M78543 M8754 Autolite 3924 Spark Plug (4 Pack)**JSIERLUOV**$8.91**36 rev5mo ago](https://www.amazon.com/dp/B0GKM9NZQP) [![2 Pack RC12YC Spark Plug for Briggs and Stratton 491055S 491055T 491055 692051 792015 for Kohler 12 132 02-S for Champion RC12YC Spark Plugs](https://m.media-amazon.com/images/I/41sTw2M4T8L.jpg)**2 Pack RC12YC Spark Plug for Briggs and Stratton 491055S 491055T 491055 692051 792015 for Kohler 12 132 02-S for Champion RC12YC Spark Plugs**YUEARN**$7.60**82 rev1y ago](https://www.amazon.com/dp/B0F9YFPSBN) [![Wetenex RC12YC Spark Plug for Brigg 491055T 491055S 491055 692051 792015 kohler 12 132 02-S Champion RC12YC Spark Plug (2 PACK)](https://m.media-amazon.com/images/I/41LAGVTq9EL.jpg)**Wetenex RC12YC Spark Plug for Brigg 491055T 491055S 491055 692051 792015 kohler 12 132 02-S Champion RC12YC Spark Plug (2 PACK)**Wetenex**$7.73**265 rev1y ago](https://www.amazon.com/dp/B0DSVH5784) [![(Pack of 2) Champion Spark Plugs for John Deere M78543 M87543 RC12YC Engine](https://m.media-amazon.com/images/I/31sAtuAWzYL.jpg)**(Pack of 2) Champion Spark Plugs for John Deere M78543 M87543 RC12YC Engine**Champion**$8.66**1,263 rev5y ago](https://www.amazon.com/dp/B08T7P3S61) [![RC12YC Spark Plug for BS 491055 491055S 692051 792015 5066 Kohler 25 132 12-S M78543Pack of 4](https://m.media-amazon.com/images/I/41Jhw7FDBdL.jpg)**RC12YC Spark Plug for BS 491055 491055S 692051 792015 5066 Kohler 25 132 12-S M78543Pack of 4**Butom**$9.39**1,300 rev8y ago](https://www.amazon.com/dp/B07F84H8XY)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![JSIERLUOV RC12YC BKR5E Spark Plugs for MTD 759-3336 Champion Briggs 491055S 692051 792015 kohler 12 132 02-S John Deere M78543 M8754 Autolite 3924 Spark Plug (4 Pack)](https://m.media-amazon.com/images/I/41xSsBvzECL.jpg)**JSIERLUOV RC12YC BKR5E Spark Plugs for MTD 759-3336 Champion Briggs 491055S 692051 792015 kohler 12 132 02-S John Deere M78543 M8754 Autolite 3924 Spark Plug (4 Pack)**JSIERLUOV**$8.91**4.7★**▲ 92%**](https://www.amazon.com/dp/B0GKM9NZQP) [![GENUINE CHAMPION SPARK PLUGS - RC12YC SPARK PLUG (PREM PLUG IS 2071) 515312](https://m.media-amazon.com/images/I/31sAtuAWzYL.jpg)**GENUINE CHAMPION SPARK PLUGS - RC12YC SPARK PLUG (PREM PLUG IS 2071) 515312**Champion**$9.46**4.7★**▲ 61%**](https://www.amazon.com/dp/B008TSZPYG) [![Champion Copper Plus 71 (RC12YC) Pack of 4 (UPC 037551500147) for 1984-2020 Toyota Corolla](https://m.media-amazon.com/images/I/31edZFj6BFL.jpg)**Champion Copper Plus 71 (RC12YC) Pack of 4 (UPC 037551500147) for 1984-2020 Toyota Corolla**Champion**$11.78**4.8★**▲ 60%**](https://www.amazon.com/dp/B005FF0JG0) [![MAXPOWER 334058 Spark Plug For Riding Mowers NGK BKR5E Champion RC12YC Autolite 3924](https://m.media-amazon.com/images/I/316ZDk7AO0L.jpg)**MAXPOWER 334058 Spark Plug For Riding Mowers NGK BKR5E Champion RC12YC Autolite 3924**Maxpower**$5.01**4.7★**▲ 42%**](https://www.amazon.com/dp/B003VPAEPM) [![(Pack of 2) Champion Spark Plugs for John Deere M78543 M87543 RC12YC Engine](https://m.media-amazon.com/images/I/31sAtuAWzYL.jpg)**(Pack of 2) Champion Spark Plugs for John Deere M78543 M87543 RC12YC Engine**Champion**$8.66**4.8★**▲ 34%**](https://www.amazon.com/dp/B08T7P3S61)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — +83.8% search growth over the last 90 days.

12K8KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: Apr, May, Jun · busiest ÷ quietest = 43.0×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Quality-Overall**19%

*“Very good quality arrived on time as described”*

**Socket/Port/Plug**17%

*“Plugs work well”*

**Advertised Vs Actual Product**16%

*“As advertised”*

**Value For Money**16%

*“Good price”*

**Size-Overall**16%

*“Correct size”*

**Efficiency**3%

*“Works perfectly”*

**Assembly/Installation**3%

*“Easy to install”*

**Correct Contents**2%

*“This is the exact replacement item”*

**Motor Power**2%

*“Solid replacement parts for small motors”*

**Brightness/Shine/Glow**1%

*“Sparky”*

### **What buyers complain about **

**Socket/Port/Plug**16%

*“Horrible spark plugs”*

**Size-Overall**11%

*“are a smidge too long”*

**Quality-Overall**11%

*“Junk”*

**Advertised Vs Actual Product**11%

*“Didn't read the full description”*

**Value For Money**11%

*“Spark plugs, just expensive”*

**Flammable**8%

*“known to cause backfires in generators”*

**Natural Resource Wastage**5%

*“Total waste of money”*

**Product Condition**5%

*“One was used”*

**Durability**5%

*“Mower is dead after installation”*

**Drop/Impact Protection**5%

*“No protection”*

### **Top return reasons **

**Size-Overall**49%

**Advertised Vs Actual Product**19%

**Defective Material/Parts**7%

**Compatibility-Overall**7%

**Value For Money**4%

**Functionality-Overall**3%

**Socket/Port/Plug**3%

**Quality-Overall**1%

**Product Condition**1%

**Motor Issues**1%