Is onan 4000 tune up kit profitable to sell on Amazon United States?

The niche generates $108K/yr across 25 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is +24.9%. Flapen's verdict: Worth a look (53/100).

How competitive is the onan 4000 tune up kit niche?

16 brands and 70 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 73% of demand.

What do buyers complain about in onan 4000 tune up kit?

Top complaints mined from reviews: Functionality-Overall, Durability, Filtration. The return rate is 1.9%.

When does demand for onan 4000 tune up kit peak?

Demand peaks in Aug–Oct; the busiest month runs 2.3× the quietest.

What does it cost to enter the onan 4000 tune up kit niche?

Listings span $8.25–$623.76; the average listing price is $63.45 (sweet spot $15–$100). The average incumbent carries 340 reviews — the moat a new listing must climb.

onan 4000 tune up kit

Worth a look

Shows a sweet-spot price point ($63.45 avg), but prices mostly outside the sweet spot ($8.25–$623.76) keeps it on the watch list.

Avg price

Great$63.45

avg listing price — sweet spot $15–$100

Review moat

Great340.48

avg incumbent reviews — the moat a new listing must climb

Returns

Great1.9%

return rate — above 5% kills the launch gate

Competition

Good49%

top-5 click share — leaders hold, buyers still browse

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Brand share

Good73%

top-5 brand share — brands hold most of the demand

Growth

Good+24.9%

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

Conversion

Okay3.8%

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

Market size

Okay$108K

$108K/yr · 44K searches

Price range

Bad$8.25–$623.76

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

Signals High Price

According to Flapen's Amazon United States niche tracking, onan 4000 tune up kit is a $108K/yr Amazon United States market (44K searches/yr). The top 5 brands hold 73% of demand. Demand peaks in Aug–Oct. Verdict: Worth a look — 53/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

onan 4000 tune up kit market data

Units sold / yr: 1K–2K; avg 0–100/product
Revenue / yr: $79K–$95K; units × avg price
Conversion rate: 3.8%
Avg BSR: #1,151
Page quality: 0%
Prime: 100%
Sponsored: 72%
Out of stock: 3.5%
Avg brand age: 40 months
Avg seller age: 172 days

Competition & brand share

The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.

Brands

16 rising

Sellers

Top-5 brand share

73%

Top 20: 100%

Top-5 click share

49%

Top 20: 94%

Open market

23%

Cummins37%
GPS15%
FLYINGAMZ8%
ATRACYPART7%
Topkidame5%
partszen4%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +24.9% search growth over the last 90 days.

Peak months: Aug, Oct · busiest ÷ quietest = 2.3×

Open Trend

Top onan 4000 tune up kit search terms

onan generator parts22K/yr +32.5%0.4% conv.
onan 4000 generator parts6K/yr +25.6%0.7% conv.
onan 5500 fuel filter5K/yr +28.5%10.5% conv.
parts for onan generator6K/yr -16.8%0.0% conv.
onan fuel filter3K/yr +46.9%7.2% conv.
onan 5500 generator parts3K/yr +15.9%0.6% conv.

All search terms

Top onan 4000 tune up kit products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

CUMMINS NW Cummins - 149-2341-01 149234101 Onan Fuel Filter

Cummins$25.884.8★1,331 rev

149-2341-01 Fuel Filter Pump Replacement For Cummins Onan model Compatible with Marquis Gold HGJAB Emerald Advantage HGJAC Marquis BGM & NHM Gasoline Generators Marquis Platinum/QG Series

FLYINGAMZ$14.624.4★1,381 rev

Carburetor Carb for Onan 146-0785 146-0803 Generator KY Series A042P619 for Onan Cummins A041D736 Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KYFA26100K Generator Replaces 146-0759

Topkidame$35.114.0★64 rev

GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Onan RV generator model KY 4000 Spec A-R

GPS$69.504.7★615 rev

Cummins NW Cummins 3271413 Onan Circuit Board

Cummins$623.764.1★69 rev

Newest

by launch date

Oil Change Tune Up Kit Fit For Onan RV QG Generators 5500 7000 HGJAA HGJAB HGJAC Includes 122-0836 Oil Filter 140-3116 Air Filter 149-2341-01 Fuel Filter E11015 Fuel Pump F5TC Spark Plug

ZJTBLL$31.4616 rev

10mo ago

FLTRUCKTOP Filter Kit for Onan RV QG Generators 5500 7000

FLTRUCKTOP$48.7916 rev

11mo ago

140-3116 Air Filter 122-0836 Oil Filter 149-2341 Fuel Filter 167-1638 Sprk Plug Tune Up Kit Compatible With Onan RV QG 5500 7000 Marquis Gold Platinum EFI HGJAA HGJAB HGJAC

AULDAY$27.922 rev

1y ago

Carburetor Carb for Onan 146-0785 146-0803 Generator KY Series A042P619 for Onan Cummins A041D736 Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KYFA26100K Generator Replaces 146-0759

Topkidame$35.1164 rev

1y ago

CNRAQR 149-2620 Electric Fuel Pump with 149-2314-01 Fuel Filter RV Replacement for Cummins Onan Marquis Gold 5500 5.5KW Gas Generator RV 5500 EVAP Motor E11015 Generator Parts

CNRAQR$25.5251 rev

1y ago

What buyers say about onan 4000 tune up kit

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

What buyers love

Size-Overall21%

“Direct fit”

Quality-Overall19%

“Good quality”

Value For Money15%

“well worth it”

Assembly/Installation11%

“Easy installation”

Advertised Vs Actual Product8%

“As advertised”

Filtration5%

“The air filter seems to be of good quality”

Fuel Efficiency4%

“Generator is now more efficient”

Efficiency3%

“Works perfectly”

Functionality-Overall2%

“Works great”

Correct Contents2%

“Perfect kit”

What buyers complain about

Functionality-Overall17%

“Did not work”

Durability14%

“died in ~5minutes”

Filtration14%

“Dont trust the fuel filter”

Quality-Overall8%

“The air filter is the worst quality”

Maintenance And Repair5%

“I wish I had replaced it sooner”

Product Condition5%

“Received a used carburetor and hose only”

Compatibility-Overall4%

“They contacted us to let us know that it's not compatible with our ONAN generator”

Defective Material/Parts4%

“Cummins part number”

Leak-Proof2%

“leaking fuel into the engine”

Pressure2%

“ours had too much pressure”

Top return reasons

Size-Overall22%

Functionality-Overall19%

Defective Material/Parts11%

Compatibility-Overall10%

Filtration10%

Leak-Proof6%

Fuel Efficiency3%

Value For Money3%

Advertised Vs Actual Product3%

Assembly/Installation2%

Common questions

Is onan 4000 tune up kit profitable to sell on Amazon United States?: The niche generates $108K/yr across 25 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is +24.9%. Flapen's verdict: Worth a look (53/100).
How competitive is the onan 4000 tune up kit niche?: 16 brands and 70 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 73% of demand.
What do buyers complain about in onan 4000 tune up kit?: Top complaints mined from reviews: Functionality-Overall, Durability, Filtration. The return rate is 1.9%.
When does demand for onan 4000 tune up kit peak?: Demand peaks in Aug–Oct; the busiest month runs 2.3× the quietest.
What does it cost to enter the onan 4000 tune up kit niche?: Listings span $8.25–$623.76; the average listing price is $63.45 (sweet spot $15–$100). The average incumbent carries 340 reviews — the moat a new listing must climb.

onan 4000 tune up kit

onan 4000 tune up kit market data

Competition & brand share

Demand & seasonality

Top onan 4000 tune up kit search terms

Top onan 4000 tune up kit products on Amazon

Top sellers

Newest

Trending

What buyers say about onan 4000 tune up kit

What buyers love

What buyers complain about

Top return reasons

Common questions

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