---
title: "Stihl Fs91r Carburetor — $45K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/stihl-fs91r-carburetor"
last_updated: "2026-08-09T22:31:11.805Z"
locale: en
meta:
description: "Niche score 70/100 · $45K/yr market · 13K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 70/100 · $45K/yr market · 13K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Stihl Fs91r Carburetor — $45K/yr Amazon US Niche (2026) - Flapen"
---
# **stihl fs91r carburetor**
**Worth a look**
Shows a thin review moat (38 avg reviews), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 11Growth 95Conversion 95Competition 50Returns 88Price range 95Avg price 95Brand share 62Review moat 98Quality gap 79
**Review moat**
**Incredible****37.81**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Incredible****+122.5%**
90-day search growth — must beat 0% to launch
**Conversion**
**Incredible****12.3%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Incredible****$28.59**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$19.75–$57.87**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Returns**
**Great****1.3%**
return rate — above 5% kills the launch gate
**Quality gap**
**Great****4.2★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Good****68%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****55%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Bad****$45K**
$45K/yr · 13K searches
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, stihl fs91r carburetor is a $45K/yr Amazon United States market (13K searches/yr). The top 5 brands hold 68% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Worth a look — 70/100.
Data updated Jul 16, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **stihl fs91r carburetor market data**
- **Units sold / yr**
- **2K–2K**
- avg 100–250/product
- **Revenue / yr**
- **$43K–$57K**
- units × avg price
- **Conversion rate**
- **12.3%**
- **Avg BSR**
- **#1,816**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **2.3%**
- **Avg brand age**
- **37 months**
- **Avg seller age**
- **183 days**
## **Competition & brand share**
The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▲rising
**Sellers**
**21**
**Top-5 brand share**
**68%**
Top 20: 100%
**Top-5 click share**
**55%**
Top 20: 100%
**Open market**
**25%**
- Mikatesi21% - HUZTL14% - Dakule13% - Eamonhigh12% - Stihl9% - Hipa7%
## **Demand & seasonality**
Weekly Amazon search volume, last 54 weeks — +122.5% search growth over the last 90 days.
450350Prime Day '25Spike '26 seasonJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 5.4×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/stihl-fs91r-carburetor/trend)
## **Top stihl fs91r 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%4%$2K8%$4K12%$5K16%$7K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**HUZTL FS 91 R Trimmer Carburetor Air Filter Kit for STIHL FS91R FS91 FC91 FS111 FC111 KM91R KM111R HT102 FC96 Trimmer Brushcutter 4180-120-0615 Carb**HUZTL**$33.07**4.6★144 rev](https://www.amazon.com/dp/B0773KMPB6) [2**Mikatesi FS91 FS91R Carburetor for Stihl 4180-120-0615 FS91 R FS111 FS89 HT102 HT103 FC91 FC96 KM91 KM111 FC111 Brushcutter Trimmer with 4180-007-1005 Valve Clearance Setting 41801410300Air Filter Kit**Mikatesi**$30.14**4.4★29 rev](https://www.amazon.com/dp/B0C5RVXMD9) [3**FS 111R Carburetor Replacement for Stihl FS91R KM91R FS91 FS111 FS89 HT102 HT103 KM111 Brushcutter Trimmer Engine 4180-120-0615 4180 120 0618 Carb with Air Filter Tune Up Kit**Eamonhigh**$23.95**4.4★43 rev](https://www.amazon.com/dp/B0DHQM1PF5) [4**Stihl FS91r carburetor FC91 FS111rx fc111 KM91R HT102 hl91 4180 120 0618 OEM silver**Stihl**$57.87**4.6★36 rev](https://www.amazon.com/dp/B0D4JJ9NFG) [5**Dakule FS91R Carburetor with Valve Adjustment Kit for Stihl FS91 FS91R FS111 FS89 KM91R KM111R FC111 HT102 FC96 Trimmer Brushcutter Replace 4180-120-0615 Carb & Air Filter**Dakule**$30.89**4.4★7 rev](https://www.amazon.com/dp/B0F1D915GN)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Hipa FS 91 R Carburetor Compatible with STIHL FS91 FS91R FC91 FS111 FC111 KM91R KM111 KM111R HT102 Trimmer Brushcutter Replace 4180 120 0615**Hipa**$26.28**10 rev6mo ago](https://www.amazon.com/dp/B0GGHCT66Q) [**Dakule FS91R Carburetor with Valve Adjustment Kit for Stihl FS91 FS91R FS111 FS89 KM91R KM111R FC111 HT102 FC96 Trimmer Brushcutter Replace 4180-120-0615 Carb & Air Filter**Dakule**$30.89**7 rev1y ago](https://www.amazon.com/dp/B0F1D915GN) [**FS 111R Carburetor Replacement for Stihl FS91R KM91R FS91 FS111 FS89 HT102 HT103 KM111 Brushcutter Trimmer Engine 4180-120-0615 4180 120 0618 Carb with Air Filter Tune Up Kit**Eamonhigh**$23.95**43 rev1y ago](https://www.amazon.com/dp/B0DHQM1PF5) [**FitBest Carburetor FS91 with Tune up Kits for Stihl FS89 FS89R FS91R FC91 FC96 FS111 FC111 FS111R FS111RX KM91 KM91R KM111R HT102 HT103 Trimmer Brushcutter 4180-120-0615 Carb**FitBest**$19.75**16 rev2y ago](https://www.amazon.com/dp/B0D7MFX4YT) [**Stihl FS91r carburetor FC91 FS111rx fc111 KM91R HT102 hl91 4180 120 0618 OEM silver**Stihl**$57.87**36 rev2y ago](https://www.amazon.com/dp/B0D4JJ9NFG)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Hipa FS 91 R Carburetor Compatible with STIHL FS91 FS91R FC91 FS111 FC111 KM91R KM111 KM111R HT102 Trimmer Brushcutter Replace 4180 120 0615**Hipa**$26.28**3.9★**▲ 119%**](https://www.amazon.com/dp/B0GGHCT66Q) [**FS 111R Carburetor Replacement for Stihl FS91R KM91R FS91 FS111 FS89 HT102 HT103 KM111 Brushcutter Trimmer Engine 4180-120-0615 4180 120 0618 Carb with Air Filter Tune Up Kit**Eamonhigh**$23.95**4.4★**▲ 86%**](https://www.amazon.com/dp/B0DHQM1PF5) [**Dakule FS91R Carburetor with Valve Adjustment Kit for Stihl FS91 FS91R FS111 FS89 KM91R KM111R FC111 HT102 FC96 Trimmer Brushcutter Replace 4180-120-0615 Carb & Air Filter**Dakule**$30.89**4.4★**▲ 77%**](https://www.amazon.com/dp/B0F1D915GN) [**Mikatesi FS91 FS91R Carburetor for Stihl 4180-120-0615 FS91 R FS111 FS89 HT102 HT103 FC91 FC96 KM91 KM111 FC111 Brushcutter Trimmer with 4180-007-1005 Valve Clearance Setting 41801410300Air Filter Kit**Mikatesi**$30.14**4.4★**▲ 62%**](https://www.amazon.com/dp/B0C5RVXMD9) [**Dakule Carburetor compatible with STIHL Trimmer Brushcutter FS91R FS91 FC91 FS111 FC111 KM91R KM111R HT102 FC96 with Air Filter Kit 4180-120-0615 Carb**Dakule**$27.00**4.2★**▲ 55%**](https://www.amazon.com/dp/B0CLJM3WDN)
**~~View all trending →~~**
## **What buyers say about stihl fs91r carburetor**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**21%
*“Perfect fit”*
**Quality-Overall**15%
*“They are just as good as OEM at a fraction of the price”*
**Advertised Vs Actual Product**13%
*“Works as it should”*
**Value For Money**12%
*“saving so much money”*
**Assembly/Installation**10%
*“Installation is fairly simple”*
**Product Condition**8%
*“Runs like new”*
**Durability**6%
*“It lives”*
**Maintenance And Repair**6%
*“Repair kit”*
**Adjustability/Rotatability/Reclining**5%
*“needed no adjustments”*
**Measurement/Reading Accuracy**3%
*“The calibration tool was a huge saver, thanks”*
### **What buyers complain about **
**Functionality-Overall**33%
*“Carburetor does not work”*
**Value For Money**17%
*“Not worth it”*
**Assembly/Installation**17%
*“just got time to install it”*
**Quality-Overall**17%
*“Junk”*
**Size-Overall**17%
*“The gas line included is not the correct size”*
### **Top return reasons **
**Functionality-Overall**25%
**Advertised Vs Actual Product**15%
**Size-Overall**14%
**Defective Material/Parts**13%
**Leak-Proof**5%
**Mechanism Issues**5%
**Compatibility-Overall**4%
**Durability**3%
**Assembly/Installation**2%
**Fuel Efficiency**2%
## **Common questions**
- **Is stihl fs91r carburetor profitable to sell on Amazon United States?**
- The niche generates $45K/yr across 16 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +122.5%. Flapen's verdict: Worth a look (70/100).
- **How competitive is the stihl fs91r carburetor niche?**
- 13 brands and 21 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 68% of demand.
- **What do buyers complain about in stihl fs91r carburetor?**
- Top complaints mined from reviews: Functionality-Overall, Value For Money, Assembly/Installation. The return rate is 1.3%.
- **When does demand for stihl fs91r carburetor peak?**
- Demand peaks in Apr–May–Jun–Jul; the busiest month runs 5.4× the quietest.
- **What does it cost to enter the stihl fs91r carburetor niche?**
- Listings span $19.75–$57.87; the average listing price is $28.59 (sweet spot $15–$100). The average incumbent carries 38 reviews — the moat a new listing must climb.
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