---
title: "spark plug thread repair kit — Niche Verdict: Worth a look (58/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/spark-plug-thread-repair-kit"
last_updated: "2026-07-14T03:43:14.484Z"
locale: en
meta:
  description: "spark plug thread repair kit shows a sweet-spot price point ($42.71 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:description": "spark plug thread repair kit shows a sweet-spot price point ($42.71 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:title": "spark plug thread repair kit — Niche Verdict: Worth a look (58/100) | Amazon United States - Flapen"
---

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# **spark plug thread repair kit**

**Worth a look**

Shows a sweet-spot price point ($42.71 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 28Growth 50Conversion 39Competition 70Returns 43Price range 44Avg price 95Brand share 90Review moat 87Quality gap 78

**Avg price**

**Incredible****$42.71**

avg listing price — sweet spot $15–$100

**Brand share**

**Great****45%**

top-5 brand share — no brand owns this niche

**Review moat**

**Great****251.97**

avg incumbent reviews — the moat a new listing must climb

**Quality gap**

**Great****4.3★**

avg incumbent rating — lower means beatable quality

**Competition**

**Good****43%**

top-5 click share — leaders hold, buyers still browse

**Growth**

**Okay****+19.9%**

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

**Price range**

**Okay****$8.52–$203.09**

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

**Returns**

**Okay****3.8%**

return rate — above 6% kills the launch gate

**Conversion**

**Okay****3.1%**

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

**Market size**

**Okay****$121K**

$121K/yr · 90K searches

## **Competition**

The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**34 **▲rising

**Sellers**

**108**

**Top-5 brand share**

**45%**

**Open market**

**49%**

- MARKETTY11% - NINEFOX11% - CLLOMAGY9% - Cal-Van Tools7% - SHMZK7% - XuYelora6%

## **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%3%$4K6%$7K9%$11K12%$14K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 36 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![MARKETTY 38900 Two Valve Ford Triton Tool Kit Foolproof Repair System Spark Plug Thread Repair Kit Compatible with 4.6L 5.4L and 6.8 V-10 Ford Triton Two Valve Engines (Black)](https://m.media-amazon.com/images/I/51-w+N9qmOL.jpg)**MARKETTY 38900 Two Valve Ford Triton Tool Kit Foolproof Repair System Spark Plug Thread Repair Kit Compatible with 4.6L 5.4L and 6.8 V-10 Ford Triton Two Valve Engines (Black)**MARKETTY**$65.57**4.6★223 rev](https://www.amazon.com/dp/B0CMWV2W4W) [2![CLLOMAGY 38900 Two Valve Tool Kit for Ford Triton Spark Plug Thread Repair Kit Foolproof Spark Plug Repair System Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine](https://m.media-amazon.com/images/I/51BJQaGHXgL.jpg)**CLLOMAGY 38900 Two Valve Tool Kit for Ford Triton Spark Plug Thread Repair Kit Foolproof Spark Plug Repair System Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine**CLLOMAGY**$65.64**4.7★148 rev](https://www.amazon.com/dp/B0CW1B5J8L) [3![NINEFOX Spark Plug Thread Repair Kit M14x1.25 11 PCS Insert and Tap Set 10 Inserts + 1 Tap for Cylinder Head Rethreading Cars Trucks Generators](https://m.media-amazon.com/images/I/51CFHUZE+oL.jpg)**NINEFOX Spark Plug Thread Repair Kit M14x1.25 11 PCS Insert and Tap Set 10 Inserts + 1 Tap for Cylinder Head Rethreading Cars Trucks Generators**NINEFOX**$15.85**4.6★62 rev](https://www.amazon.com/dp/B0DRJGV1JN) [4![CalVan Tools 38900 Two Valve Ford Triton Tool Kit - Foolproof Repair System Spark Plug Thread Repair Kit. Tools and Equipment](https://m.media-amazon.com/images/I/41qbA9isOdL.jpg)**CalVan Tools 38900 Two Valve Ford Triton Tool Kit - Foolproof Repair System Spark Plug Thread Repair Kit. Tools and Equipment**Cal-Van Tools**$203.09**4.8★2,694 rev](https://www.amazon.com/dp/B000Z9D6KW) [5![SHMZK 11 PCS Spark Plug Thread Repair Kit M141.25 Inserts and M161.25 Tap Spark Plug Rethreading Set Stainless Steel Thread Repair Tool Kit for Automotive Gasoline Engines Generators](https://m.media-amazon.com/images/I/4115XkafpFL.jpg)**SHMZK 11 PCS Spark Plug Thread Repair Kit M141.25 Inserts and M161.25 Tap Spark Plug Rethreading Set Stainless Steel Thread Repair Tool Kit for Automotive Gasoline Engines Generators**SHMZK**$13.12**4.4★73 rev](https://www.amazon.com/dp/B0DSBC6Q5L)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![GEARCESS 38900 Two Valve Tool Kit for Ford Triton Spark Plug Repair Kit Spark Thread Plug Repair Kit Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine](https://m.media-amazon.com/images/I/41QDRv1g48L.jpg)**GEARCESS 38900 Two Valve Tool Kit for Ford Triton Spark Plug Repair Kit Spark Thread Plug Repair Kit Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine**GEARCESS**$77.82**2 rev4mo ago](https://www.amazon.com/dp/B0GR8T6LBW) [![DEEFILL M14x1.25 Back-Tap Spark Plug Thread Repair Tool - Thread Chaser & Restorer for Stripped Spark Plug Holes No Head Removal Debris-Free Engine-Safe Design Fits 14mm Spark Plug Threads](https://m.media-amazon.com/images/I/31TjuqmhdzL.jpg)**DEEFILL M14x1.25 Back-Tap Spark Plug Thread Repair Tool - Thread Chaser & Restorer for Stripped Spark Plug Holes No Head Removal Debris-Free Engine-Safe Design Fits 14mm Spark Plug Threads**DEEFILL**$18.79**9 rev5mo ago](https://www.amazon.com/dp/B0GKXCRTXW) [![KJE 38900 Two Valve Ford Triton Tool Kit Spark Plug Thread Repair Kit Compatible with Ford 4.6 L 5.4 L 6.8V-10 SOHC Engines Foolproof Repair System for No.389-100 Replacement Inserts 1/2 Drive](https://m.media-amazon.com/images/I/41qUG8Bpt2L.jpg)**KJE 38900 Two Valve Ford Triton Tool Kit Spark Plug Thread Repair Kit Compatible with Ford 4.6 L 5.4 L 6.8V-10 SOHC Engines Foolproof Repair System for No.389-100 Replacement Inserts 1/2 Drive**KJE**$65.20**4 rev6mo ago](https://www.amazon.com/dp/B0GFHLRP4X) [![SENNMONN M14x1.25 9.4mm&15mm Insert Qty 20 Spark Plug Thread Repair Kit Thread Repair Kit with Storage Case](https://m.media-amazon.com/images/I/41pTJVdwsKL.jpg)**SENNMONN M14x1.25 9.4mm&15mm Insert Qty 20 Spark Plug Thread Repair Kit Thread Repair Kit with Storage Case**SENNMONN**$69.55**6 rev6mo ago](https://www.amazon.com/dp/B0G7ZG249N) [![Frandilo Spark Plug Thread Repair kit M10x1.0 Bolt M12x1.0 Tap Stainless Steel Repair kit for Automotive Engine Cylinder Head Rethreaded Kit Repairs Tools(Color:Silver)](https://m.media-amazon.com/images/I/41g6GkOCHjL.jpg)**Frandilo Spark Plug Thread Repair kit M10x1.0 Bolt M12x1.0 Tap Stainless Steel Repair kit for Automotive Engine Cylinder Head Rethreaded Kit Repairs Tools(Color:Silver)**Frandilo**$14.17**6 rev8mo ago](https://www.amazon.com/dp/B0G234HS1R)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![GEARCESS 38900 Two Valve Tool Kit for Ford Triton Spark Plug Repair Kit Spark Thread Plug Repair Kit Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine](https://m.media-amazon.com/images/I/41QDRv1g48L.jpg)**GEARCESS 38900 Two Valve Tool Kit for Ford Triton Spark Plug Repair Kit Spark Thread Plug Repair Kit Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine**GEARCESS**$77.82**2.5★**▲ 193%**](https://www.amazon.com/dp/B0GR8T6LBW) [![KJE 38900 Two Valve Ford Triton Tool Kit Spark Plug Thread Repair Kit Compatible with Ford 4.6 L 5.4 L 6.8V-10 SOHC Engines Foolproof Repair System for No.389-100 Replacement Inserts 1/2 Drive](https://m.media-amazon.com/images/I/41qUG8Bpt2L.jpg)**KJE 38900 Two Valve Ford Triton Tool Kit Spark Plug Thread Repair Kit Compatible with Ford 4.6 L 5.4 L 6.8V-10 SOHC Engines Foolproof Repair System for No.389-100 Replacement Inserts 1/2 Drive**KJE**$65.20**5.0★**▲ 192%**](https://www.amazon.com/dp/B0GFHLRP4X) [![BZBMGMO M10 X 1.0X12.7 Spark Plug Repair Short Tooling KIT Metric Thread Repair Kit Especially Suitable for Repairing Motorcycle UTV ATV and Snowmobile Spark Plug Repair](https://m.media-amazon.com/images/I/41hUg65d-tL.jpg)**BZBMGMO M10 X 1.0X12.7 Spark Plug Repair Short Tooling KIT Metric Thread Repair Kit Especially Suitable for Repairing Motorcycle UTV ATV and Snowmobile Spark Plug Repair**BZBMGMO**$55.05**4.2★**▲ 187%**](https://www.amazon.com/dp/B09B4PH36L) [![DEEFILL M14x1.25 Back-Tap Spark Plug Thread Repair Tool - Thread Chaser & Restorer for Stripped Spark Plug Holes No Head Removal Debris-Free Engine-Safe Design Fits 14mm Spark Plug Threads](https://m.media-amazon.com/images/I/31TjuqmhdzL.jpg)**DEEFILL M14x1.25 Back-Tap Spark Plug Thread Repair Tool - Thread Chaser & Restorer for Stripped Spark Plug Holes No Head Removal Debris-Free Engine-Safe Design Fits 14mm Spark Plug Threads**DEEFILL**$18.79**4.3★**▲ 185%**](https://www.amazon.com/dp/B0GKXCRTXW) [![XuYelora Spark Plug Thread Repair kit M10x1.0 Bolt M12x1.0 Tap Stainless Steel Repair kit for Automotive Engine Cylinder Head Rethreaded Kit Repairs Tools(Color:Silver)](https://m.media-amazon.com/images/I/41g6GkOCHjL.jpg)**XuYelora Spark Plug Thread Repair kit M10x1.0 Bolt M12x1.0 Tap Stainless Steel Repair kit for Automotive Engine Cylinder Head Rethreaded Kit Repairs Tools(Color:Silver)**XuYelora**$13.24**4.2★**▲ 136%**](https://www.amazon.com/dp/B0FCF387LF)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — +19.9% search growth over the last 90 days.

5K3KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: May · busiest ÷ quietest = 2.7×

## **Reviews**

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

### **What buyers love **

**Advertised Vs Actual Product**20%

*“Functions as advertised”*

**Quality-Overall**20%

*“Good quality set at a good price”*

**Value For Money**14%

*“Great price”*

**Ease Of Use**11%

*“Easy to use”*

**Efficiency**7%

*“Works well”*

**Instructions/User Manual/Troubleshooting**5%

*“Clear instructions and a quality tool”*

**Size-Overall**3%

*“Everything fits perfectly”*

**Strength**2%

*“Good, solid set”*

**Durability**2%

*“These are very durable”*

**Add-Ons/Attachments**2%

*“Easy to use all needed accessories”*

### **What buyers complain about **

**Quality-Overall**12%

*“Bad Quality”*

**Functionality-Overall**10%

*“That cant even spell spark correctly on the box”*

**Instructions/User Manual/Troubleshooting**8%

*“no instructions”*

**Durability**6%

*“Broke within 5 minutes of use”*

**Material Quality**6%

*“Cheap material”*

**Metal Quality**5%

*“Bad cheap metal it will make your car w I use”*

**Socket/Port/Plug**4%

*“Thread reamer socket head is too big”*

**Value For Money**4%

*“Its cheaper in the long run”*

**Ease Of Use**4%

*“unusable after one use”*

**Size-Overall**3%

*“a bit long”*

### **Top return reasons **

**Size-Overall**42%

**Defective Material/Parts**13%

**Compatibility-Overall**9%

**Functionality-Overall**7%

**Advertised Vs Actual Product**6%

**Quality-Overall**3%

**Product Condition**3%

**Durability**3%

**Value For Money**2%

**Maintenance And Repair**2%