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f6rtc spark plug

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Soft demand (-44.8% this quarter) — this niche doesn't clear our bar today.

Market size 29Growth 3Conversion 99Competition 18Returns 83Price range 50Avg price 31Brand share 16Review moat 75Quality gap 22

Conversion

Incredible18.5%

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

Returns

Great1.6%

return rate — above 6% kills the launch gate

Review moat

Good517.54

avg incumbent reviews — the moat a new listing must climb

Price range

Good$4.13–$25.80

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

Avg price

Okay$9.68

avg listing price — sweet spot $15–$100

Market size

Okay$129K

$129K/yr · 72K searches

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Competition

Bad78%

top-5 click share — a locked-up shelf

Brand share

Bad94%

top-5 brand share — brand-locked demand

Growth

Bad-44.8%

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

Competition

The top 5 products capture 78% of clicks — a locked-up shelf that new listings rarely crack.

Brands

8 flat

Sellers

43

Top-5 brand share

94%

Open market

4%

  • TORCH37%
  • Champion25%
  • Kizut20%
  • Hipa7%
  • YAMAKATO4%
  • Stens2%
  • Open — no brand owns it (2 brands, 4%)

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%$13K20%$26K30%$39K40%$52K101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 13 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -44.8% search growth over the last 90 days.
4K3KSpike '24Holiday '24Spike '25Holiday '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Jan, Apr, May · busiest ÷ quietest = 3.9×

Reviews

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

What buyers love

Size-Overall22%

“Exact fit”

Quality-Overall17%

“Good quality”

Socket/Port/Plug14%

“These spark plugs are the best”

Value For Money10%

“Worth the money”

Advertised Vs Actual Product9%

“Works as intended”

Efficiency5%

“Works good”

Ease Of Cleaning3%

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

Blower3%

“Fits perfectly in my snow blower”

Motor Power3%

“Engine starts right up like new”

Assembly/Installation2%

“Installation is straightforward”

What buyers complain about

Size-Overall32%

“Didn't fit my spark plug cap”

Advertised Vs Actual Product23%

“Not accurate description”

Ease Of Use9%

“it was hard to start”

Motor Issues9%

“old gas kills a mower”

Functionality-Overall8%

“Function poor”

Quality-Overall5%

“These are poor quality”

Durability3%

“These simply do not last very long”

Value For Money3%

“Not worth the money”

Top return reasons

Size-Overall52%
Advertised Vs Actual Product16%
Functionality-Overall7%
Socket/Port/Plug6%
Defective Material/Parts6%
Value For Money3%
Compatibility-Overall3%
Maintenance And Repair1%
Assembly/Installation1%
Product Condition1%