vertical shaft engine
Skip itPricing outside the sweet spot ($760.42 avg) — this niche doesn't clear our bar today.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Review moat
Great148.07avg incumbent reviews — the moat a new listing must climb
Growth
Great+70.3%90-day search growth — must beat 0% to launch
Quality gap
Great4.3★avg incumbent rating — lower means beatable quality
Competition
Good44%top-5 click share — leaders hold, buyers still browse
Market size
Okay$141K$141K/yr · 232K searches
Brand share
Bad99%top-5 brand share — brand-locked demand
Conversion
Bad0.1%search→purchase rate — share of searches ending in a sale
Avg price
Bad$760.42avg listing price — sweet spot $15–$100
Price range
Bad$137.71–$3119.37cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, vertical shaft engine is a $141K/yr Amazon United States market (232K searches/yr). The top 5 brands hold 99% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Skip it — 49/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
vertical shaft engine market data
- Units sold / yr
- 250–500
- avg 0–100/product
- Revenue / yr
- $190K–$380K
- units × avg price
- Conversion rate
- 0.1%
- Avg BSR
- #2,914
- Page quality
- 0%
- Prime
- 17%
- Sponsored
- 73%
- Out of stock
- 7.4%
- Avg brand age
- 35 months
- Avg seller age
- 174 days
Competition & brand share
The top 5 products take 44% of clicks — established leaders, but buyers still shop beyond them.Brands
6 falling
Sellers
28
Top-5 brand share
99%
Top 20: 100%
Top-5 click share
44%
Top 20: 90%
Open market
0%
- Briggs & Stratton76%
- Aceup Energy18%
- Generic2%
- Kawasaki2%
- BILT HARD2%
- LUPENGSHOP1%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +70.3% search growth over the last 90 days.Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 2.7×
Top vertical shaft engine search terms
- vertical shaft engine42K/yr
- lawn mower engine26K/yr
- briggs and stratton engine27K/yr
- briggs stratton replacement engines21K/yr
- vertical engine12K/yr
- vertical shaft gas engine11K/yr
- lawn mower motor9K/yr
- mower engine10K/yr
- replacement lawn mower engine7K/yr
- vertical shaft lawn mower engine9K/yr
Top vertical shaft engine 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Briggs and Stratton Vertical 17.5 HP 500cc INTEK Engine 9amp 1 x 3-5/32 #31R977-0054
Briggs & Stratton$716.324.6★354 rev
Briggs & Stratton 14D932-0110-F1 Professional Series 10 GT 223cc Vertical Engine
Briggs & Stratton$317.164.2★8 rev
Aceup Energy Gas Engine Vertical Shaft 4.4HP 173cc 4-Stroke OHV Gas Motor with Primer for Lawn Mower EPA Compliant
Aceup Energy$142.534.1★115 rev
Briggs & Stratton 104M02-0197 7.25tp 163cc Vertical Shaft 7/8 x 3-5/32 Inch for mowers
Briggs & Stratton$240.764.2★43 rev
Briggs & Stratton 44S977-0032-G1 25 GHP Vertical Shaft Engine Black
Briggs & Stratton$1155.234.5★100 rev
Newest
by launch date
Aceup Energy 4.4HP 173cc 4-Stroke Gas Motor Gas Engine Vertical Shaft with Primer for Lawn Mower
Aceup Energy$137.7114 rev
Aceup Energy 4.4HP 173cc Gas Engine Vertical Shaft 4-Stroke Gas Motor with Primer for Lawn Mower
Aceup Energy$138.3614 rev
Briggs & Stratton 49T877-0049-Z1 Commercial Series 27 HP 810cc Vertical Engine
Briggs & Stratton$1418.700 rev
Briggs & Stratton 93J02-0001-F1 Ex Series 6.25 GT 150cc Vertical Shaft Engine
Briggs & Stratton$290.251 rev
24 HP 724cc Intek Series Engine 1 x 3-5/32 inch (Replaces Briggs 44N877)
Generic$1192.118 rev
Trending
90-day click momentumAceup Energy 4.4HP 173cc 4-Stroke Gas Motor Gas Engine Vertical Shaft with Primer for Lawn Mower
Aceup Energy$137.714.4★
Briggs & Stratton 40N777-0027 20hp 656cc Intek Series 1 x 3-5/32 9 Amp
Briggs & Stratton$890.324.7★
Briggs & Stratton 14D932-0110-F1 Professional Series 10 GT 223cc Vertical Engine
Briggs & Stratton$317.164.2★
Briggs & Stratton 93J02-0001-F1 Ex Series 6.25 GT 150cc Vertical Shaft Engine
Briggs & Stratton$290.255.0★
Briggs & Stratton 49T877-0049-Z1 Commercial Series 27 HP 810cc Vertical Engine
Briggs & Stratton$1418.700.0★
What buyers say about vertical shaft engine
What buyers praise and complain about, mined from review topics.What buyers love
“Perfect fit”
“Good motor”
“Good value”
“fairly easy to install”
“Great product”
“Better than expected”
“Easy, easy”
“Easy swap plug and play”
“its very strong”
“Safety”
What buyers complain about
“which means it won't last long”
“Government intrusion causing quality issues”
“Engine not plug”
“Engine did not work”
“Not as easy as it looks”
“1 - the carburetor bowl is very shallow”
“Great Engine, poor instructions”
“How ever engine sent was'nt as represented in online presentation”
“Not a good deal”
“Not worth the hassle to add them”
Top return reasons
Common questions
- Is vertical shaft engine profitable to sell on Amazon United States?
- The niche generates $141K/yr across 30 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is +70.3%. Flapen's verdict: Skip it (49/100).
- How competitive is the vertical shaft engine niche?
- 6 brands and 28 sellers compete. The top 5 products take 44% of clicks and top 5 brands hold 99% of demand.
- What do buyers complain about in vertical shaft engine?
- Top complaints mined from reviews: Durability, Quality-Overall, Motor Issues. The return rate is 0.1%.
- When does demand for vertical shaft engine peak?
- Demand peaks in Apr–May–Jun–Jul; the busiest month runs 2.7× the quietest.
- What does it cost to enter the vertical shaft engine niche?
- Listings span $137.71–$3119.37; the average listing price is $760.42 (sweet spot $15–$100). The average incumbent carries 148 reviews — the moat a new listing must climb.