honda gx390 spark plug
Skip itBrand-locked demand (top 5 brands take 99% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible20.2%search→purchase rate — share of searches ending in a sale
Returns
Great1.4%return rate — above 6% kills the launch gate
Review moat
Good599.29avg incumbent reviews — the moat a new listing must climb
Market size
Good$318K$318K/yr · 158K searches
Price range
Good$4.13–$25.69cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Okay$9.97avg listing price — sweet spot $15–$100
Growth
Okay+2.3%90-day search growth — must beat 0% to launch
Competition
Okay70%top-5 click share — leaders hold, buyers still browse
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Brand share
Bad99%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.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
New NGK Standard Spark Plug BPR6ES 7131 Set of 4 Spark Plugs
NGK$15.484.8★621 rev
NGK (2 Pack) #7131 Spark Plug (2 Pack) # BDPR6ES-2pk
NGK$9.914.7★150 rev
BPR6ES NGK Spark Plug for Honda Engines & Other Small Engines (One Spark Plug)
NGK$6.734.8★1,845 rev
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$10.854.5★125 rev
Honda 2 Pack Genuine 98079-56846 Spark Plug Fits NGK BPR6ES OEM
Honda$9.384.8★963 rev
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
Yistiun$4.1310 rev
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$9.507 rev
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$10.85125 rev
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$6.011,503 rev
New NGK Standard Spark Plug BPR6ES 7131 Set of 4 Spark Plugs
NGK$15.48621 rev
Trending
90-day click momentumYistiun 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$4.134.5★
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$9.505.0★
98079-56846 (NGK BPR6ES) Honda Genuine OEM Spark Plug Honda & Other Small Engines
Honda$7.224.6★
NGK (2 Pack) #7131 Spark Plug (2 Pack) # BDPR6ES-2pk
NGK$9.914.7★
Honda 2 Pack Genuine 98079-56846 Spark Plug Fits NGK BPR6ES OEM
Honda$9.384.8★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +2.3% search growth over the last 90 days.Peak months: Mar · busiest ÷ quietest = 2.1×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Great plugs and easy order & delivery”
“Great product, Great company”
“Great value”
“As advertised”
“Exact fit”
“Easy to install”
“Runs clean and after a year of sitting the mower started first pull”
“Engine runs like a new one”
“Works good”
“And its durable”
What buyers complain about
“A little misleading”
“Both plugs failed within minutes”
“These simply do not last very long”
“Function poor”
“it was hard to start”
“Didn't fit my spark plug cap”
“received someone elses used return”
“Waste of time”
“Not worth the money”