Skip to content
50

ngk bpm8y

Worth a look

Shows searches that convert (25.0% search→purchase), but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.

Market size 34Growth 82Conversion 100Competition 15Returns 96Price range 60Avg price 40Brand share 0Review moat 75Quality gap 18

Conversion

Incredible25.0%

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

Returns

Incredible0.8%

return rate — above 6% kills the launch gate

Growth

Great+76.3%

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

Review moat

Good519.67

avg incumbent reviews — the moat a new listing must climb

Price range

Good$7.23–$26.69

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

Avg price

Okay$10.81

avg listing price — sweet spot $15–$100

Market size

Okay$166K

$166K/yr · 61K searches

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Competition

Bad82%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

Competition

The top 5 products capture 82% of clicks — a locked-up shelf that new listings rarely crack.

Brands

3 falling

Sellers

40

Top-5 brand share

100%

Open market

0%

  • NGK76%
  • Hipa22%
  • Wetenex2%

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%$17K20%$33K30%$50K40%$66K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 9 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +76.3% search growth over the last 90 days.
3K2KSpike '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Apr, May · busiest ÷ quietest = 4.4×

Reviews

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

What buyers love

Socket/Port/Plug25%

“good plugs”

Value For Money15%

“Fair price for good product”

Size-Overall14%

“Fits perfect”

Quality-Overall12%

“Great product / supplier”

Advertised Vs Actual Product12%

“Item as described”

Functionality-Overall7%

“Does it Work”

Correct Contents5%

“Correct part was shipped”

Efficiency4%

“Works perfectly”

Blower2%

“It definitely worked for my blower”

Ease Of Use2%

“Glad so easy to get”

What buyers complain about

Size-Overall33%

“Small engine spark plug”

Maintenance And Repair33%

“I try to Replace with consistency or worry about Carb issues”

Quality-Overall17%

“These are junk”

Advertised Vs Actual Product17%

“This is deceptive at best”

Top return reasons

Size-Overall50%
Advertised Vs Actual Product26%
Compatibility-Overall5%
Defective Material/Parts4%
Socket/Port/Plug4%
Value For Money3%
Functionality-Overall3%
Quality-Overall1%
Assembly/Installation1%
Certifications1%