---
title: "vertical shaft engine — Niche Verdict: Worth a look (56/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/patio-lawn-garden/vertical-shaft-engine"
last_updated: "2026-07-10T03:36:40.936Z"
locale: en
meta:
  description: "vertical shaft engine shows low returns (0.1%), but a small market ($141K/yr) keeps it on the watch list."
  "og:description": "vertical shaft engine shows low returns (0.1%), but a small market ($141K/yr) keeps it on the watch list."
  "og:title": "vertical shaft engine — Niche Verdict: Worth a look (56/100) | Amazon United States - Flapen"
---

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# **vertical shaft engine**

**Worth a look****56/100 **

vertical shaft engine shows low returns (0.1%), but a small market ($141K/yr) keeps it on the watch list.

**Market/yr**

**$141K**

**Growth (1y)**

**+247.4%**

**Products**

**30**

**Brands**

**6**

was 8 a year ago

**Sellers**

**28**

**Price range**

**$137.71–$3119.37**

**Returns**

**0.1%**

**Rating**

**4.3★**

**Worth a look**

Scored 56/100 across market size, growth, competition, quality gap, and returns.

Market sizeGrowthCompetitionQuality gapReturns

Market size

**7**

 ×0.30

Growth

**81**

 ×0.30

Competition

**67**

 ×0.20

Quality gap

**63**

 ×0.10

Returns

**100**

 ×0.10

## **Demand**

Weekly Amazon search volume, last 104 weeks — +247.4% year over year.

7K3KSpike '25Spike '26Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26

## **Seasonality**

Monthly demand index across the year — 1.00 is average.

JFMAMJJASOND

Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 2.7×

## **Competition**

- Briggs & Stratton76% - Aceup Energy18% - Generic2% - Kawasaki2% - BILT HARD2% - LUPENGSHOP1%

The top 5 products take 44% of clicks — established leaders, but buyers still shop beyond them. 6 brands and 28 sellers compete here.

**Brands**

**6 **▼falling

was 8 a year ago

**Sellers**

**28**

**Top 5 brand share**

**99%**

#ProductBrandPriceRatingReviewsClick shareTrend

1
![Briggs and Stratton Vertical 17.5 HP 500cc INTEK Engine 9amp 1 x 3-5/32 #31R977-0054](https://m.media-amazon.com/images/I/41sSVcnGm7L.jpg) [**Briggs and Stratton Vertical 17.5 HP 500cc INTEK Engine 9amp 1 x 3-5/32 #31R977-0054**](https://www.amazon.com/dp/B07F261TPJ)

Briggs & Stratton$716.324.6★35411%▲rising

2
![Briggs & Stratton 14D932-0110-F1 Professional Series 10 GT 223cc Vertical Engine](https://m.media-amazon.com/images/I/31hewV4XtQL.jpg) [**Briggs & Stratton 14D932-0110-F1 Professional Series 10 GT 223cc Vertical Engine**](https://www.amazon.com/dp/B0CCXG822P)

Briggs & Stratton$317.164.2★811%▲rising

3
![Aceup Energy Gas Engine Vertical Shaft 4.4HP 173cc 4-Stroke OHV Gas Motor with Primer for Lawn Mower EPA Compliant](https://m.media-amazon.com/images/I/41LlntR+66L.jpg) [**Aceup Energy Gas Engine Vertical Shaft 4.4HP 173cc 4-Stroke OHV Gas Motor with Primer for Lawn Mower EPA Compliant**](https://www.amazon.com/dp/B0D48ZW86X)

Aceup Energy$142.534.1★11510%▼falling

4
![Briggs & Stratton 104M02-0197 7.25tp 163cc Vertical Shaft 7/8 x 3-5/32 Inch for mowers](https://m.media-amazon.com/images/I/41PB+6OXs7L.jpg) [**Briggs & Stratton 104M02-0197 7.25tp 163cc Vertical Shaft 7/8 x 3-5/32 Inch for mowers**](https://www.amazon.com/dp/B0BYWDNCV7)

Briggs & Stratton$240.764.2★437%▲rising

5
![Briggs & Stratton 44S977-0032-G1 25 GHP Vertical Shaft Engine Black](https://m.media-amazon.com/images/I/41YEXp9b5DL.jpg) [**Briggs & Stratton 44S977-0032-G1 25 GHP Vertical Shaft Engine Black**](https://www.amazon.com/dp/B07B8WV67P)

Briggs & Stratton$1155.234.5★1006%▲rising

6
![Aceup Energy 4.4HP 173cc Gas Engine Vertical Shaft 4-Stroke Gas Motor with Primer for Lawn Mower](https://m.media-amazon.com/images/I/41ahZ8FSTtL.jpg) [**Aceup Energy 4.4HP 173cc Gas Engine Vertical Shaft 4-Stroke Gas Motor with Primer for Lawn Mower**](https://www.amazon.com/dp/B0FHH2NF68)

Aceup Energy$138.364.4★146%▲rising

7
![Briggs and Stratton 725EXi Series Single Cylinder Air-Cooled 4-Cycle Gas Engine](https://m.media-amazon.com/images/I/41vj++R5SsL.jpg) [**Briggs and Stratton 725EXi Series Single Cylinder Air-Cooled 4-Cycle Gas Engine**](https://www.amazon.com/dp/B07KMHLKC4)

Briggs & Stratton$239.393.8★906%—flat

8
![Briggs and Stratton Vertical Engine 19 HP 540cc 1 x 3-5/32 #33S877-0043](https://m.media-amazon.com/images/I/417rZQj3F+L.jpg) [**Briggs and Stratton Vertical Engine 19 HP 540cc 1 x 3-5/32 #33S877-0043**](https://www.amazon.com/dp/B0C3BDPCLK)

Briggs & Stratton$785.684.6★1006%▲rising

9
![Briggs & Stratton 875 Professional Series Engine Black](https://m.media-amazon.com/images/I/418EXchh2nL.jpg) [**Briggs & Stratton 875 Professional Series Engine Black**](https://www.amazon.com/dp/B07DX9715F)

Briggs & Stratton$291.823.8★1354%▼falling

10

![Briggs & Stratton 49T877-0050-Z1 Commercial Series 27 HP 810cc Vertical Engine](https://m.media-amazon.com/images/I/41q-Epbr5-L.jpg) [**Briggs & Stratton 49T877-0050-Z1 Commercial Series 27 HP 810cc Vertical Engine**](https://www.amazon.com/dp/B07NZCVRZR)

Briggs & Stratton$1411.784.2★393%—flat

11

![Aceup Energy 4.4HP 173cc 4-Stroke Gas Motor Gas Engine Vertical Shaft with Primer for Lawn Mower](https://m.media-amazon.com/images/I/41R6nreF+DL.jpg) [**Aceup Energy 4.4HP 173cc 4-Stroke Gas Motor Gas Engine Vertical Shaft with Primer for Lawn Mower**](https://www.amazon.com/dp/B0GQ9J1FPM)

Aceup Energy$137.714.4★143%▲rising

12

![Briggs & Stratton 31R907-0007-G1 500cc 17.5 Gross HP Engine with 1-Inch by 3-5/32-Inch Length Crankshaft Tapped 7-16-20-Inch](https://m.media-amazon.com/images/I/41fCtEmq6UL.jpg) [**Briggs & Stratton 31R907-0007-G1 500cc 17.5 Gross HP Engine with 1-Inch by 3-5/32-Inch Length Crankshaft Tapped 7-16-20-Inch**](https://www.amazon.com/dp/B00IUAYGP2)

Briggs & Stratton$728.634.5★4152%—flat

13

![Briggs & Stratton 9P602-0139 5tp 140cc Vertical Shaft 7/8 x 3-5/32 for mowers](https://m.media-amazon.com/images/I/41elNXA2dQL.jpg) [**Briggs & Stratton 9P602-0139 5tp 140cc Vertical Shaft 7/8 x 3-5/32 for mowers**](https://www.amazon.com/dp/B0BTWKQ84G)

Briggs & Stratton$203.014.4★762%▼falling

14

![Briggs & Stratton 33S877-0019-G1 Professional Series 19 HP 540cc Vertical Engine](https://m.media-amazon.com/images/I/41n6IeR94xL.jpg) [**Briggs & Stratton 33S877-0019-G1 Professional Series 19 HP 540cc Vertical Engine**](https://www.amazon.com/dp/B07DWZMSZH)

Briggs & Stratton$754.204.5★4702%▼falling

15

![Briggs & Stratton 49T877-0049-Z1 Commercial Series 27 HP 810cc Vertical Engine](https://m.media-amazon.com/images/I/41IwIRXHwEL.jpg) [**Briggs & Stratton 49T877-0049-Z1 Commercial Series 27 HP 810cc Vertical Engine**](https://www.amazon.com/dp/B0F8MYD69B)

Briggs & Stratton$1418.700.0★02%▲rising

**~~Showing 15 of 30 — show all ~~**

## **Product shelf**

All 30 tracked products in this niche.

Top sellersNewestTrending

[![Briggs and Stratton Vertical 17.5 HP 500cc INTEK Engine 9amp 1 x 3-5/32 #31R977-0054](https://m.media-amazon.com/images/I/41sSVcnGm7L.jpg)**Briggs and Stratton Vertical 17.5 HP 500cc INTEK Engine 9amp 1 x 3-5/32 #31R977-0054** Briggs & Stratton**$716.32**4.6★354 reviews](https://www.amazon.com/dp/B07F261TPJ) [![Briggs & Stratton 14D932-0110-F1 Professional Series 10 GT 223cc Vertical Engine](https://m.media-amazon.com/images/I/31hewV4XtQL.jpg)**Briggs & Stratton 14D932-0110-F1 Professional Series 10 GT 223cc Vertical Engine** Briggs & Stratton**$317.16**4.2★8 reviews](https://www.amazon.com/dp/B0CCXG822P) [![Aceup Energy Gas Engine Vertical Shaft 4.4HP 173cc 4-Stroke OHV Gas Motor with Primer for Lawn Mower EPA Compliant](https://m.media-amazon.com/images/I/41LlntR+66L.jpg)**Aceup Energy Gas Engine Vertical Shaft 4.4HP 173cc 4-Stroke OHV Gas Motor with Primer for Lawn Mower EPA Compliant** Aceup Energy**$142.53**4.1★115 reviews](https://www.amazon.com/dp/B0D48ZW86X) [![Briggs & Stratton 104M02-0197 7.25tp 163cc Vertical Shaft 7/8 x 3-5/32 Inch for mowers](https://m.media-amazon.com/images/I/41PB+6OXs7L.jpg)**Briggs & Stratton 104M02-0197 7.25tp 163cc Vertical Shaft 7/8 x 3-5/32 Inch for mowers** Briggs & Stratton**$240.76**4.2★43 reviews](https://www.amazon.com/dp/B0BYWDNCV7) [![Briggs & Stratton 44S977-0032-G1 25 GHP Vertical Shaft Engine Black](https://m.media-amazon.com/images/I/41YEXp9b5DL.jpg)**Briggs & Stratton 44S977-0032-G1 25 GHP Vertical Shaft Engine Black** Briggs & Stratton**$1155.23**4.5★100 reviews](https://www.amazon.com/dp/B07B8WV67P) [![Aceup Energy 4.4HP 173cc Gas Engine Vertical Shaft 4-Stroke Gas Motor with Primer for Lawn Mower](https://m.media-amazon.com/images/I/41ahZ8FSTtL.jpg)**Aceup Energy 4.4HP 173cc Gas Engine Vertical Shaft 4-Stroke Gas Motor with Primer for Lawn Mower** Aceup Energy**$138.36**4.4★14 reviews](https://www.amazon.com/dp/B0FHH2NF68) [![Briggs and Stratton 725EXi Series Single Cylinder Air-Cooled 4-Cycle Gas Engine](https://m.media-amazon.com/images/I/41vj++R5SsL.jpg)**Briggs and Stratton 725EXi Series Single Cylinder Air-Cooled 4-Cycle Gas Engine** Briggs & Stratton**$239.39**3.8★90 reviews](https://www.amazon.com/dp/B07KMHLKC4) [![Briggs and Stratton Vertical Engine 19 HP 540cc 1 x 3-5/32 #33S877-0043](https://m.media-amazon.com/images/I/417rZQj3F+L.jpg)**Briggs and Stratton Vertical Engine 19 HP 540cc 1 x 3-5/32 #33S877-0043** Briggs & Stratton**$785.68**4.6★100 reviews](https://www.amazon.com/dp/B0C3BDPCLK)

## **Reviews**

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

### **What buyers love **

**Size-Overall**21%

*“Perfect fit”*

**Motor Power**20%

*“Good motor”*

**Value For Money**15%

*“Good value”*

**Assembly/Installation**11%

*“fairly easy to install”*

**Quality-Overall**9%

*“Great product”*

**Advertised Vs Actual Product**3%

*“Better than expected”*

**Ease Of Use**3%

*“Easy, easy”*

**Socket/Port/Plug**3%

*“Easy swap plug and play”*

**Strength**3%

*“its very strong”*

**Safety Standards**1%

*“Safety”*

### **What buyers complain about **

**Durability**28%

*“which means it won't last long”*

**Quality-Overall**19%

*“Government intrusion causing quality issues”*

**Motor Issues**11%

*“Engine not plug”*

**Functionality-Overall**4%

*“Engine did not work”*

**Ease Of Use**4%

*“Not as easy as it looks”*

**Size-Overall**4%

*“1 - the carburetor bowl is very shallow”*

**Instructions/User Manual/Troubleshooting**3%

*“Great Engine, poor instructions”*

**Advertised Vs Actual Product**2%

*“How ever engine sent was'nt as represented in online presentation”*

**Value For Money**2%

*“Not a good deal”*

**Add-Ons/Attachments**2%

*“Not worth the hassle to add them”*

#### **Top return reasons**- Size-Overall74% - Defective Material/Parts9% - Motor Issues5% - Advertised Vs Actual Product5% - Strength2% - Value For Money2% - Add-Ons/Attachments1% - Mechanism Issues1%