---
title: "honda gx390 spark plug — Niche Verdict: Skip it (44/100) | Amazon United States - Flapen"
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last_updated: "2026-07-14T08:18:48.168Z"
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  description: "brand-locked demand (top 5 brands take 99% of clicks) — honda gx390 spark plug doesn't clear our bar today."
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  "og:title": "honda gx390 spark plug — Niche Verdict: Skip it (44/100) | Amazon United States - Flapen"
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# **honda gx390 spark plug**

**Skip it**

Brand-locked demand (top 5 brands take 99% of clicks) — this niche doesn't clear our bar today.

Market size 52Growth 28Conversion 100Competition 25Returns 88Price range 50Avg price 33Brand share 4Review moat 73Quality gap 18

**Conversion**

**Incredible****20.2%**

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

**Returns**

**Great****1.4%**

return rate — above 6% kills the launch gate

**Review moat**

**Good****599.29**

avg incumbent reviews — the moat a new listing must climb

**Market size**

**Good****$318K**

$318K/yr · 158K searches

**Price range**

**Good****$4.13–$25.69**

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

**Avg price**

**Okay****$9.97**

avg listing price — sweet spot $15–$100

**Growth**

**Okay****+2.3%**

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

**Competition**

**Okay****70%**

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

**Quality gap**

**Bad****4.7★**

avg incumbent rating — lower means beatable quality

**Brand share**

**Bad****99%**

top-5 brand share — brand-locked demand

## **Competition**

The top 5 products take 70% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**6 **▲rising

**Sellers**

**83**

**Top-5 brand share**

**99%**

**Open market**

**0%**

- NGK60% - Honda17% - Hipa10% - Wetenex10% - TORCH2% - Yistiun1%

## **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%$32K20%$64K30%$95K40%$127K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 14 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![New NGK Standard Spark Plug BPR6ES 7131 Set of 4 Spark Plugs](https://m.media-amazon.com/images/I/41DGSQ7wDkL.jpg)**New NGK Standard Spark Plug BPR6ES 7131 Set of 4 Spark Plugs**NGK**$15.48**4.8★621 rev](https://www.amazon.com/dp/B00WF9O3W0) [2![NGK (2 Pack) #7131 Spark Plug (2 Pack) # BDPR6ES-2pk](https://m.media-amazon.com/images/I/31qWPT3ntsL.jpg)**NGK (2 Pack) #7131 Spark Plug (2 Pack) # BDPR6ES-2pk**NGK**$9.91**4.7★150 rev](https://www.amazon.com/dp/B00FEQRD6Y) [3![BPR6ES NGK Spark Plug for Honda Engines & Other Small Engines (One Spark Plug)](https://m.media-amazon.com/images/I/419duXEQ82L.jpg)**BPR6ES NGK Spark Plug for Honda Engines & Other Small Engines (One Spark Plug)**NGK**$6.73**4.8★1,845 rev](https://www.amazon.com/dp/B00S7RZX28) [4![BPR6ES Spark Plug for NGK BPR6ES BP6ES Torch F6RTC MTD 951-10292 Honda 98079-56846 GX120 GX160 GX200 GX240 GX270 GX340 GX390 4 PACK](https://m.media-amazon.com/images/I/41rf2LMvsOL.jpg)**BPR6ES Spark Plug for NGK BPR6ES BP6ES Torch F6RTC MTD 951-10292 Honda 98079-56846 GX120 GX160 GX200 GX240 GX270 GX340 GX390 4 PACK**Wetenex**$10.85**4.5★125 rev](https://www.amazon.com/dp/B0DSVGK983) [5![Honda 2 Pack Genuine 98079-56846 Spark Plug Fits NGK BPR6ES OEM](https://m.media-amazon.com/images/I/41cdkLfMb1L.jpg)**Honda 2 Pack Genuine 98079-56846 Spark Plug Fits NGK BPR6ES OEM**Honda**$9.38**4.8★963 rev](https://www.amazon.com/dp/B01CXCHEJ2)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Yistiun BPR6ES Spark Plug for NGK 7131 for Torch F6RTC F6TC MTD 951-10292 951-10292A 751-10292 for Honda 98079-56846 for Champion RN9YC RN10YC GX120 GX160 GX200 GX240 GX270 GX340 GX390](https://m.media-amazon.com/images/I/41ifXBR1U8L.jpg)**Yistiun BPR6ES Spark Plug for NGK 7131 for Torch F6RTC F6TC MTD 951-10292 951-10292A 751-10292 for Honda 98079-56846 for Champion RN9YC RN10YC GX120 GX160 GX200 GX240 GX270 GX340 GX390**Yistiun**$4.13**10 rev5mo ago](https://www.amazon.com/dp/B0GKYPC5L8) [![Hipa BPR6ES Spark Plugs Compatible with NGK 7131 Torch F6RTC MTD 951-10292 751-10292 Honda 98079-56846 Engines & Other Small Engines (Pack of 4)](https://m.media-amazon.com/images/I/41gomi9hudL.jpg)**Hipa BPR6ES Spark Plugs Compatible with NGK 7131 Torch F6RTC MTD 951-10292 751-10292 Honda 98079-56846 Engines & Other Small Engines (Pack of 4)**Hipa**$9.50**7 rev8mo ago](https://www.amazon.com/dp/B0FY6HYXXM) [![BPR6ES Spark Plug for NGK BPR6ES BP6ES Torch F6RTC MTD 951-10292 Honda 98079-56846 GX120 GX160 GX200 GX240 GX270 GX340 GX390 4 PACK](https://m.media-amazon.com/images/I/41rf2LMvsOL.jpg)**BPR6ES Spark Plug for NGK BPR6ES BP6ES Torch F6RTC MTD 951-10292 Honda 98079-56846 GX120 GX160 GX200 GX240 GX270 GX340 GX390 4 PACK**Wetenex**$10.85**125 rev1y ago](https://www.amazon.com/dp/B0DSVGK983) [![TORCH F6RTC 131-039 Spark Plug Replace for NGK BPR6ES Spark Plug for Bosch WR6DC WR7DC Spark Plug for Champion RN9YC RN10YC Spark Plug for Denso W20EPR-U Spark Plug for MTD 951-10292/751-10292 OEM ea](https://m.media-amazon.com/images/I/31QodRRGjmL.jpg)**TORCH F6RTC 131-039 Spark Plug Replace for NGK BPR6ES Spark Plug for Bosch WR6DC WR7DC Spark Plug for Champion RN9YC RN10YC Spark Plug for Denso W20EPR-U Spark Plug for MTD 951-10292/751-10292 OEM ea**TORCH**$6.01**1,503 rev4y ago](https://www.amazon.com/dp/B09S8DQ3JL) [![New NGK Standard Spark Plug BPR6ES 7131 Set of 4 Spark Plugs](https://m.media-amazon.com/images/I/41DGSQ7wDkL.jpg)**New NGK Standard Spark Plug BPR6ES 7131 Set of 4 Spark Plugs**NGK**$15.48**621 rev9y ago](https://www.amazon.com/dp/B00WF9O3W0)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Yistiun BPR6ES Spark Plug for NGK 7131 for Torch F6RTC F6TC MTD 951-10292 951-10292A 751-10292 for Honda 98079-56846 for Champion RN9YC RN10YC GX120 GX160 GX200 GX240 GX270 GX340 GX390](https://m.media-amazon.com/images/I/41ifXBR1U8L.jpg)**Yistiun BPR6ES Spark Plug for NGK 7131 for Torch F6RTC F6TC MTD 951-10292 951-10292A 751-10292 for Honda 98079-56846 for Champion RN9YC RN10YC GX120 GX160 GX200 GX240 GX270 GX340 GX390**Yistiun**$4.13**4.5★**▲ 194%**](https://www.amazon.com/dp/B0GKYPC5L8) [![Hipa BPR6ES Spark Plugs Compatible with NGK 7131 Torch F6RTC MTD 951-10292 751-10292 Honda 98079-56846 Engines & Other Small Engines (Pack of 4)](https://m.media-amazon.com/images/I/41gomi9hudL.jpg)**Hipa BPR6ES Spark Plugs Compatible with NGK 7131 Torch F6RTC MTD 951-10292 751-10292 Honda 98079-56846 Engines & Other Small Engines (Pack of 4)**Hipa**$9.50**5.0★**▲ 161%**](https://www.amazon.com/dp/B0FY6HYXXM) [![98079-56846 (NGK BPR6ES) Honda Genuine OEM Spark Plug Honda & Other Small Engines](https://m.media-amazon.com/images/I/41eJT-XURiL.jpg)**98079-56846 (NGK BPR6ES) Honda Genuine OEM Spark Plug Honda & Other Small Engines**Honda**$7.22**4.6★**▲ 99%**](https://www.amazon.com/dp/B00WIZG9EG) [![NGK (2 Pack) #7131 Spark Plug (2 Pack) # BDPR6ES-2pk](https://m.media-amazon.com/images/I/31qWPT3ntsL.jpg)**NGK (2 Pack) #7131 Spark Plug (2 Pack) # BDPR6ES-2pk**NGK**$9.91**4.7★**▲ 25%**](https://www.amazon.com/dp/B00FEQRD6Y) [![Honda 2 Pack Genuine 98079-56846 Spark Plug Fits NGK BPR6ES OEM](https://m.media-amazon.com/images/I/41cdkLfMb1L.jpg)**Honda 2 Pack Genuine 98079-56846 Spark Plug Fits NGK BPR6ES OEM**Honda**$9.38**4.8★**— 7%**](https://www.amazon.com/dp/B01CXCHEJ2)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — +2.3% search growth over the last 90 days.

8K6KSpike '24Spike '25Prime Day '25Holiday '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: Mar · busiest ÷ quietest = 2.1×

## **Reviews**

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

### **What buyers love **

**Socket/Port/Plug**20%

*“Great plugs and easy order & delivery”*

**Quality-Overall**20%

*“Great product, Great company”*

**Value For Money**17%

*“Great value”*

**Advertised Vs Actual Product**14%

*“As advertised”*

**Size-Overall**13%

*“Exact fit”*

**Assembly/Installation**3%

*“Easy to install”*

**Ease Of Cleaning**2%

*“Runs clean and after a year of sitting the mower started first pull”*

**Motor Power**2%

*“Engine runs like a new one”*

**Efficiency**2%

*“Works good”*

**Durability**1%

*“And its durable”*

### **What buyers complain about **

**Advertised Vs Actual Product**14%

*“A little misleading”*

**Socket/Port/Plug**14%

*“Both plugs failed within minutes”*

**Durability**12%

*“These simply do not last very long”*

**Functionality-Overall**11%

*“Function poor”*

**Ease Of Use**9%

*“it was hard to start”*

**Size-Overall**9%

*“Didn't fit my spark plug cap”*

**Product Condition**5%

*“received someone elses used return”*

**Natural Resource Wastage**5%

*“Waste of time”*

**Value For Money**3%

*“Not worth the money”*

### **Top return reasons **

**Size-Overall**58%

**Compatibility-Overall**10%

**Advertised Vs Actual Product**10%

**Defective Material/Parts**6%

**Socket/Port/Plug**5%

**Functionality-Overall**4%

**Value For Money**3%

**Assembly/Installation**1%

**Heating**1%

**Motor Issues**1%