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kohler 1413211 spark plug

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Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Market size 14Growth 95Conversion 100Competition 17Returns 91Price range 49Avg price 55Brand share 0Review moat 78Quality gap 20

Conversion

Incredible22.4%

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

Growth

Incredible+115.9%

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

Returns

Great1.2%

return rate — above 6% kills the launch gate

Review moat

Great436.1

avg incumbent reviews — the moat a new listing must climb

Avg price

Good$12.64

avg listing price — sweet spot $15–$100

Price range

Okay$6.01–$23.57

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

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Competition

Bad80%

top-5 click share — a locked-up shelf

Market size

Bad$55K

$55K/yr · 20K searches

Brand share

Bad100%

top-5 brand share — brand-locked demand

Competition

The top 5 products capture 80% of clicks — a locked-up shelf that new listings rarely crack.

Brands

4 falling

Sellers

67

Top-5 brand share

100%

Open market

0%

  • NGK63%
  • Kohler17%
  • Hipa14%
  • Wetenex6%

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%$6K20%$11K30%$17K40%$22K101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 10 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +115.9% search growth over the last 90 days.
800600Spike '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 4.6×

Reviews

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

What buyers love

Size-Overall30%

“Fit perfect”

Value For Money22%

“Great deal”

Advertised Vs Actual Product16%

“As Advertised”

Quality-Overall10%

“Spark plugs great quality”

Fuel Efficiency3%

“Installed it as part of a full wake-up service. fresh fuel, oil change, new plug”

Efficiency3%

“We worked fine”

Socket/Port/Plug3%

“Good plugs”

Brightness/Shine/Glow3%

“Best spark for my Victory”

Assembly/Installation3%

“Easy to install”

Motor Power2%

“These fit my little outboard motor perfectly amd work like id expect from the brand”

What buyers complain about

Functionality-Overall33%

“These did not work”

Size-Overall33%

“May be a smaller socket size than the oem plug”

Durability17%

“if 2 months from now the mower is running badly”

Top return reasons

Size-Overall71%
Advertised Vs Actual Product9%
Compatibility-Overall6%
Functionality-Overall4%
Socket/Port/Plug3%
Defective Material/Parts2%
Value For Money2%
Motor Issues2%
Mechanism Issues1%
Heating1%