---
title: "Onan 4000 Carburetor — $61K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/onan-4000-carburetor"
last_updated: "2026-08-10T15:19:44.198Z"
locale: en
meta:
description: "Niche score 49/100 · $61K/yr market · 23K searches/yr · $35.68 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 49/100 · $61K/yr market · 23K searches/yr · $35.68 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Onan 4000 Carburetor — $61K/yr Amazon US Niche (2026) - Flapen"
---
# **onan 4000 carburetor**
**Skip it**
A concentrated shelf (top 5 take 87% of clicks) — this niche doesn't clear our bar today.
Market size 15Growth 57Conversion 76Competition 11Returns 34Price range 95Avg price 95Brand share 31Review moat 94Quality gap 78
**Avg price**
**Incredible****$35.68**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$23.74–$57.69**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Great****122.38**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Great****7.2%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Good****+31.7%**
90-day search growth — must beat 0% to launch
**Returns**
**Okay****4.3%**
return rate — above 5% kills the launch gate
**Brand share**
**Okay****87%**
top-5 brand share — brands hold most of the demand
**Market size**
**Bad****$61K**
$61K/yr · 23K searches
**Competition**
**Bad****87%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, onan 4000 carburetor is a $61K/yr Amazon United States market (23K searches/yr). The top 5 brands hold 87% of demand. Demand peaks in Jul–Aug–Sep. Verdict: Skip it — 49/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **onan 4000 carburetor market data**
- **Units sold / yr**
- **2K–2K**
- avg 100–250/product
- **Revenue / yr**
- **$54K–$71K**
- units × avg price
- **Conversion rate**
- **7.2%**
- **Avg BSR**
- **#1,757**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **39 months**
- **Avg seller age**
- **227 days**
## **Competition & brand share**
The top 5 products capture 87% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**13 **▲rising
**Sellers**
**14**
**Top-5 brand share**
**87%**
Top 20: 100%
**Top-5 click share**
**87%**
Top 20: 100%
**Open market**
**17%**
- ATRACYPART34% - Topkidame30% - sworwin8% - ANZBENH4% - JDLLONG4% - goodfind684% - Open — no brand owns it (7 brands, 17%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +31.7% search growth over the last 90 days.
600400Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jul, Aug, Sep · busiest ÷ quietest = 2.1×
[**Open Trend **](https://flapen.com/research/us/automotive/onan-4000-carburetor/trend)
## **Top onan 4000 carburetor search terms**
- **onan 4000 carburetor**17K/yr+25.3%7.8% conv. - **onan microquiet 4000 carburetor**4K/yr+42.6%5.7% conv. - **onan 4000 carburetor oem**3K/yr+69.0%4.0% conv. [**All search terms **](https://flapen.com/research/us/automotive/onan-4000-carburetor/search-terms)
## **Top onan 4000 carburetor 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.
0%10%$6K20%$12K30%$18K40%$24K1101001K Reviews — right = deep review moatMarket 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.
### **Top sellers**
by 90-day click share
[1**Carburetor Carb with Gaskets for Onan Cummins Generator & Microquiet 4000-Watt 4KYFA26100 4KYFA26100P 4KYFA26100K Replace# A042P619 A041D736 146-0785**ATRACYPART**$33.21**4.2★595 rev](https://www.amazon.com/dp/B08CXGPK17) [2**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**$35.11**4.0★64 rev](https://www.amazon.com/dp/B0DHTVTCN9) [3**Carburetor Compatible with Onan Cummins A042P619 Microquiet 4000 Watt Onan 4KYFA26100 4KYFA26100P 4KYFA26100K KY Generator Replaces 146-0759 146-0785 146-0803 with Air Filter**sworwin**$35.73**4.7★30 rev](https://www.amazon.com/dp/B0F2SY7V4X) [4**Carburetor for Onan Cummins Microquiet KY Series 4000-Watt 4KYFA26100 4KYFA26100P 4KYFA26100K Replace A042P619 146-0785 A041D736 146-0635 146-0703 146-0742 146-0803 146-0743 146-0759**ANZBENH**$23.74**5.0★3 rev](https://www.amazon.com/dp/B0G2BZ6MN7) [5**JDLLONG A042P619 Carburetor Kit for Onan Cummins Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KYFA26100K Carb A041D736 A042P622 146-0785 146-0803 with 149-2311 Fuel Pump and 1403280 Air Filter**JDLLONG**$46.50**4.7★18 rev](https://www.amazon.com/dp/B0B6YZFF5G)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Carburetor for Onan Cummins Microquiet KY Series 4000-Watt 4KYFA26100 4KYFA26100P 4KYFA26100K Replace A042P619 146-0785 A041D736 146-0635 146-0703 146-0742 146-0803 146-0743 146-0759**ANZBENH**$23.74**3 rev7mo ago](https://www.amazon.com/dp/B0G2BZ6MN7) [**Carburetor Compatible for Onan Cummins A042P619 Microquiet 4000 Watt Onan 4KYFA26100 4KYFA26100P 4KYFA26100K KY Generator Replaces 146-0759 146-0785 146-0803**Dosens**$39.39**162 rev7mo ago](https://www.amazon.com/dp/B0G1XQRW8Q) [**Carbhub RV Generator A041D744 Carburetor Fit for Onan QG 4000 4KYFA-6747P for Cummins 0A6562 KY Series Generator Carb Replace 146-0881**Carbhub**$33.20**7 rev11mo ago](https://www.amazon.com/dp/B0FJM1LKTY) [**4KYFA-6747P Carburetor for Onan 4000 Generator A041D744 Cummins 0A6562 KY Generator Replace# 146-0881**BioLion**$32.68**7 rev12mo ago](https://www.amazon.com/dp/B0FHB6L1WB) [**Carburetor Compatible with Onan Cummins A042P619 Microquiet 4000 Watt Onan 4KYFA26100 4KYFA26100P 4KYFA26100K KY Generator Replaces 146-0759 146-0785 146-0803 with Air Filter**sworwin**$35.73**30 rev1y ago](https://www.amazon.com/dp/B0F2SY7V4X)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**JDLLONG A042P619 Carburetor Kit for Onan Cummins Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KYFA26100K Carb A041D736 A042P622 146-0785 146-0803 with 149-2311 Fuel Pump and 1403280 Air Filter**JDLLONG**$46.50**4.7★**▲ 142%**](https://www.amazon.com/dp/B0B6YZFF5G) [**Carburetor for Onan Cummins Microquiet KY Series 4000-Watt 4KYFA26100 4KYFA26100P 4KYFA26100K Replace A042P619 146-0785 A041D736 146-0635 146-0703 146-0742 146-0803 146-0743 146-0759**ANZBENH**$23.74**5.0★**▲ 121%**](https://www.amazon.com/dp/B0G2BZ6MN7) [**Carburetor Compatible for Onan Cummins A042P619 Microquiet 4000 Watt Onan 4KYFA26100 4KYFA26100P 4KYFA26100K KY Generator Replaces 146-0759 146-0785 146-0803**Dosens**$39.39**4.3★**▲ 117%**](https://www.amazon.com/dp/B0G1XQRW8Q) [**4KYFA-6747P Carburetor for Onan 4000 Generator A041D744 Cummins 0A6562 KY Generator Replace# 146-0881**BioLion**$32.68**4.0★**▲ 62%**](https://www.amazon.com/dp/B0FHB6L1WB) [**Carbhub RV Generator A041D744 Carburetor Fit for Onan QG 4000 4KYFA-6747P for Cummins 0A6562 KY Series Generator Carb Replace 146-0881**Carbhub**$33.20**3.6★**▲ 43%**](https://www.amazon.com/dp/B0FJM1LKTY)
**~~View all trending →~~**
## **What buyers say about onan 4000 carburetor**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Assembly/Installation**21%
*“Simple install”*
**Efficiency**17%
*“runs as good as new”*
**Value For Money**15%
*“Great deal”*
**Advertised Vs Actual Product**9%
*“Worked as described”*
**Size-Overall**7%
*“Good fit”*
**Ease Of Use**6%
*“Very easy to replace”*
**Quality-Overall**6%
*“Great product”*
**Durability**6%
*“better than it has in years”*
**Fuel Efficiency**3%
*“Very pleased to report that my generator is running perfectly”*
**Ease Of Cleaning**2%
*“And much easier than trying to clean/rebuild the old carb”*
### **What buyers complain about **
**Functionality-Overall**23%
*“It didn't work”*
**Durability**22%
*“died in ~5minutes”*
**Maintenance And Repair**6%
*“I wish I had replaced it sooner”*
**Quality-Overall**6%
*“Junk”*
**Assembly/Installation**6%
*“I did not think to check before installing”*
**Product Condition**6%
*“Received a used carburetor and hose only”*
**Leak-Proof**5%
*“VACUUM LEAK proven with smoke test”*
**Size-Overall**3%
*“Everything's tight in there”*
**Defective Material/Parts**3%
*“The reason is that the choke close spring is defective”*
**Value For Money**3%
*“Waste of money unless you need it for some parts to fix your OEM carb. OEM around $600 to $700 new”*
### **Top return reasons **
**Functionality-Overall**29%
**Size-Overall**20%
**Defective Material/Parts**11%
**Compatibility-Overall**10%
**Leak-Proof**5%
**Fuel Efficiency**4%
**Advertised Vs Actual Product**4%
**Product Condition**3%
**Filtration**2%
**Motor Issues**2%
## **Common questions**
- **Is onan 4000 carburetor profitable to sell on Amazon United States?**
- The niche generates $61K/yr across 13 tracked products. 1 of 4 products launched in the last 360 days are still selling. 90-day search growth is +31.7%. Flapen's verdict: Skip it (49/100).
- **How competitive is the onan 4000 carburetor niche?**
- 13 brands and 14 sellers compete. The top 5 products take 87% of clicks and top 5 brands hold 87% of demand.
- **What do buyers complain about in onan 4000 carburetor?**
- Top complaints mined from reviews: Functionality-Overall, Durability, Maintenance And Repair. The return rate is 4.3%.
- **When does demand for onan 4000 carburetor peak?**
- Demand peaks in Jul–Aug–Sep; the busiest month runs 2.1× the quietest.
- **What does it cost to enter the onan 4000 carburetor niche?**
- Listings span $23.74–$57.69; the average listing price is $35.68 (sweet spot $15–$100). The average incumbent carries 122 reviews — the moat a new listing must climb.
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