---
title: "Spark Plug Thread Repair Kit — $121K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/spark-plug-thread-repair-kit"
last_updated: "2026-08-09T20:40:31.393Z"
locale: en
meta:
description: "Niche score 58/100 · $121K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 58/100 · $121K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Spark Plug Thread Repair Kit — $121K/yr Amazon US Niche (2026) - Flapen"
---
# **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 40Price 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 5% 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
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, spark plug thread repair kit is a $121K/yr Amazon United States market (90K searches/yr). The top 5 brands hold 45% of demand. Demand peaks in May. Verdict: Worth a look — 58/100.
Data updated Jul 12, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **spark plug thread repair kit market data**
- **Units sold / yr**
- **3K–4K**
- avg 0–100/product
- **Revenue / yr**
- **$128K–$171K**
- units × avg price
- **Conversion rate**
- **3.1%**
- **Avg BSR**
- **#88**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **81%**
- **Out of stock**
- **5.9%**
- **Avg brand age**
- **45 months**
- **Avg seller age**
- **163 days**
## **Competition & brand share**
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%**
Top 20: 89%
**Top-5 click share**
**43%**
Top 20: 86%
**Open market**
**49%**
- MARKETTY11% - NINEFOX11% - CLLOMAGY9% - Cal-Van Tools7% - SHMZK7% - XuYelora6%
## **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×
[**Open Trend **](https://flapen.com/research/us/automotive/spark-plug-thread-repair-kit/trend)
## **Top spark plug thread repair kit search terms**
- **spark plug thread repair kit**23K/yr+59.8%2.1% conv. - **spark plug repair kit**17K/yr+32.8%2.0% conv. - **ford spark plug repair kit**13K/yr-24.3%3.0% conv. - **spark plug helicoil kit**8K/yr+23.3%2.6% conv. - **spark plug rethread kit**7K/yr+17.6%2.8% conv. - **ford 5.4 spark plug repair kit**5K/yr+3.6%2.3% conv. - **thread spark plug thread repair kits**4K/yr-0.1%0.8% conv. - **stripped spark plug repair kit**4K/yr+76.4%3.1% conv. - **triton spark plug repair kit**3K/yr+12.4%3.4% conv. - **calvan spark plug repair kit**3K/yr-2.6%5.7% conv. [**All search terms **](https://flapen.com/research/us/automotive/spark-plug-thread-repair-kit/search-terms)
## **Top spark plug thread repair kit products on Amazon**
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 24 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)**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**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**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**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**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**GEARCESS**$77.82**2 rev4mo ago](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**KJE**$65.20**4 rev6mo ago](https://www.amazon.com/dp/B0GFHLRP4X) [**Ritammi Spark Plug Repair Kit 16Pcs Carbon Steel Spark Plug Tap Thread Repair Tools M14 X 1.25 Rethreading Set with Portable Case**Ritammi**$17.75**16 rev1y ago](https://www.amazon.com/dp/B0FH39CXW8) [**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**26 rev1y ago](https://www.amazon.com/dp/B0FCF387LF) [**UHANBUT Spark Plug Thread Repair Kit Stainless Steel Car Repair Tool Accessories Include M141.25 Thread Inserts and M161.25 Tap Suitable for Automotive Gasoline Engines Generators**UHANBUT**$12.50**21 rev1y ago](https://www.amazon.com/dp/B0FBWB2P2F)
**~~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**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**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**BZBMGMO**$55.05**4.2★**▲ 187%**](https://www.amazon.com/dp/B09B4PH36L) [**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) [**NINEFOX Spark Plug Thread Repair Kit M12x1.25 11 PCS Insert and Tap Set 10 Inserts + 1 Tap for Cylinder Head Rethreading Cars Trucks Generators**NINEFOX**$15.07**4.6★**▲ 101%**](https://www.amazon.com/dp/B0DRJJ7W2Q)
**~~View all trending →~~**
## **What buyers say about spark plug thread repair kit**
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%
## **Common questions**
- **Is spark plug thread repair kit profitable to sell on Amazon United States?**
- The niche generates $121K/yr across 36 tracked products. 1 of 9 products launched in the last 360 days are still selling. 90-day search growth is +19.9%. Flapen's verdict: Worth a look (58/100).
- **How competitive is the spark plug thread repair kit niche?**
- 34 brands and 108 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 45% of demand.
- **What do buyers complain about in spark plug thread repair kit?**
- Top complaints mined from reviews: Quality-Overall, Functionality-Overall, Instructions/User Manual/Troubleshooting. The return rate is 3.8%.
- **When does demand for spark plug thread repair kit peak?**
- Demand peaks in May; the busiest month runs 2.7× the quietest.
- **What does it cost to enter the spark plug thread repair kit niche?**
- Listings span $8.52–$203.09; the average listing price is $42.71 (sweet spot $15–$100). The average incumbent carries 252 reviews — the moat a new listing must climb.
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