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sae j1171 marine starter

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

Market size 17Growth 97Conversion 56Competition 14Returns 14Price range 95Avg price 87Brand share 0Review moat 81Quality gap 84

Growth

Incredible+196.9%

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

Price range

Incredible$59.20–$71.02

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

Avg price

Great$66.43

avg listing price — sweet spot $15–$100

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Review moat

Great371.9

avg incumbent reviews — the moat a new listing must climb

Conversion

Good4.7%

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

Market size

Bad$68K

$68K/yr · 22K searches

Competition

Bad84%

top-5 click share — a locked-up shelf

Returns

Bad8.6%

return rate — above 6% kills the launch gate

Brand share

Bad100%

top-5 brand share — brand-locked demand

Competition

The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.

Brands

5 falling

Sellers

7

Top-5 brand share

100%

Open market

0%

  • BDELI43%
  • Boatrip25%
  • Parts Player18%
  • DynaVim Parts11%
  • E EZEXPREZE4%
  • Open — no brand owns it (0%)

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%15%$10K30%$21K45%$31K60%$41K101001K10K 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 — +196.9% search growth over the last 90 days.
2K1KSpike '25Prime Day '25Spike '26SepDecMarJunAugNovMarMay

Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 13.0×

Reviews

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

What buyers love

Size-Overall23%

“Fit Great”

Advertised Vs Actual Product13%

“As described”

Value For Money12%

“Cheap pricing”

Quality-Overall10%

“Excellent starter, surprisingly better quality than the dead Arco marine starter I replaced”

Functionality-Overall10%

“The starter works great”

Efficiency10%

“Works perfectly”

Assembly/Installation7%

“Installed fine”

Durability7%

“looks durable”

Motor Power3%

“The starter works great”

What buyers complain about

Functionality-Overall25%

“You will have to do double the work”

Size-Overall21%

“Doesnt fit”

Durability19%

“Does not last”

Product Condition8%

“you can see that they don't look new”

Value For Money8%

“$20 fee for returning unopened starter”

Flammable8%

“Burned up first time on the lake”

Compatibility-Overall4%

“Did not fit 3.0 mercruiser”

Maintenance And Repair3%

“already having to replace after using it the second half of last season”

Top return reasons

Size-Overall33%
Functionality-Overall14%
Compatibility-Overall13%
Defective Material/Parts10%
Advertised Vs Actual Product6%
Mounting6%
Motor Issues4%
Assembly/Installation2%
Product Condition2%
Durability2%