---
title: "Onan 4000 Tune Up Kit — $108K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/onan-4000-tune-up-kit"
last_updated: "2026-08-10T11:12:44.221Z"
locale: en
meta:
description: "Niche score 53/100 · $108K/yr market · 44K searches/yr. Prices mostly outside the sweet spot ($8.25–$623.76) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 53/100 · $108K/yr market · 44K searches/yr. Prices mostly outside the sweet spot ($8.25–$623.76) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Onan 4000 Tune Up Kit — $108K/yr Amazon US Niche (2026) - Flapen"
---
# **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.
Market size 26Growth 53Conversion 48Competition 61Returns 76Price range 14Avg price 88Brand share 54Review moat 83Quality gap 55
**Avg price**
**Great****$63.45**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****340.48**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Great****1.9%**
return rate — above 5% kills the launch gate
**Competition**
**Good****49%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Good****73%**
top-5 brand share — brands hold most of the demand
**Growth**
**Good****+24.9%**
90-day search growth — must beat 0% to launch
**Conversion**
**Okay****3.8%**
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**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
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 ~~](https://flapen.com/research/methodology)
## **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**
**70**
**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.
2K2KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Aug, Oct · busiest ÷ quietest = 2.3×
[**Open Trend **](https://flapen.com/research/us/automotive/onan-4000-tune-up-kit/trend)
## **Top onan 4000 tune up kit search terms**
- **onan generator parts**22K/yr+32.5%0.4% conv. - **onan 4000 generator parts**6K/yr+25.6%0.7% conv. - **onan 5500 fuel filter**5K/yr+28.5%10.5% conv. - **parts for onan generator**6K/yr-16.8%0.0% conv. - **onan fuel filter**3K/yr+46.9%7.2% conv. - **onan 5500 generator parts**3K/yr+15.9%0.6% conv. [**All search terms **](https://flapen.com/research/us/automotive/onan-4000-tune-up-kit/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.
0%10%$11K20%$22K30%$32K40%$43K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**CUMMINS NW Cummins - 149-2341-01 149234101 Onan Fuel Filter**Cummins**$25.88**4.8★1,331 rev](https://www.amazon.com/dp/B004RCT19I) [2**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**$14.62**4.4★1,381 rev](https://www.amazon.com/dp/B07C3L2W31) [3**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) [4**GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Onan RV generator model KY 4000 Spec A-R**GPS**$69.50**4.7★615 rev](https://www.amazon.com/dp/B07884TLCK) [5**Cummins NW Cummins 3271413 Onan Circuit Board**Cummins**$623.76**4.1★69 rev](https://www.amazon.com/dp/B00B35JIAY)
**~~View all top sellers →~~**
### **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**$31.46**16 rev10mo ago](https://www.amazon.com/dp/B0FMDYVWXY) [**FLTRUCKTOP Filter Kit for Onan RV QG Generators 5500 7000**FLTRUCKTOP**$48.79**16 rev11mo ago](https://www.amazon.com/dp/B0FK4BTMR7) [**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**$27.92**2 rev1y ago](https://www.amazon.com/dp/B0FC6F66J1) [**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**64 rev1y ago](https://www.amazon.com/dp/B0DHTVTCN9) [**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**$25.52**51 rev1y ago](https://www.amazon.com/dp/B0DHVGDLGS)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Onan OnaMax SAE 15W-40 Engine Oil 32 oz.**Cummins**$16.24**4.8★**▲ 161%**](https://www.amazon.com/dp/B00278MET8) [**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**$27.92**5.0★**▲ 125%**](https://www.amazon.com/dp/B0FC6F66J1) [**140-3280 Air Filter Replace for Onan 140-3280 48-2017 140-3295 140-2852 Fits Onan 3600 4000 Generator Air Cleaner Element compatible with Camp Power QG RV MicroLite QG RV**Deflife**$8.25**4.7★**▲ 89%**](https://www.amazon.com/dp/B0BM3BNHC9) [**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**$31.46**4.3★**▲ 79%**](https://www.amazon.com/dp/B0FMDYVWXY) [**FLTRUCKTOP Filter Kit for Onan RV QG Generators 5500 7000**FLTRUCKTOP**$48.79**3.7★**▲ 72%**](https://www.amazon.com/dp/B0FK4BTMR7)
**~~View all trending →~~**
## **What buyers say about onan 4000 tune up kit**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**21%
*“Direct fit”*
**Quality-Overall**19%
*“Good quality”*
**Value For Money**15%
*“well worth it”*
**Assembly/Installation**11%
*“Easy installation”*
**Advertised Vs Actual Product**8%
*“As advertised”*
**Filtration**5%
*“The air filter seems to be of good quality”*
**Fuel Efficiency**4%
*“Generator is now more efficient”*
**Efficiency**3%
*“Works perfectly”*
**Functionality-Overall**2%
*“Works great”*
**Correct Contents**2%
*“Perfect kit”*
### **What buyers complain about **
**Functionality-Overall**17%
*“Did not work”*
**Durability**14%
*“died in ~5minutes”*
**Filtration**14%
*“Dont trust the fuel filter”*
**Quality-Overall**8%
*“The air filter is the worst quality”*
**Maintenance And Repair**5%
*“I wish I had replaced it sooner”*
**Product Condition**5%
*“Received a used carburetor and hose only”*
**Compatibility-Overall**4%
*“They contacted us to let us know that it's not compatible with our ONAN generator”*
**Defective Material/Parts**4%
*“Cummins part number”*
**Leak-Proof**2%
*“leaking fuel into the engine”*
**Pressure**2%
*“ours had too much pressure”*
### **Top return reasons **
**Size-Overall**22%
**Functionality-Overall**19%
**Defective Material/Parts**11%
**Compatibility-Overall**10%
**Filtration**10%
**Leak-Proof**6%
**Fuel Efficiency**3%
**Value For Money**3%
**Advertised Vs Actual Product**3%
**Assembly/Installation**2%
## **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.
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