honda gx390
Skip itPricing outside the sweet spot ($508.12 avg) — this niche doesn't clear our bar today.
Review moat
Great447.29avg incumbent reviews — the moat a new listing must climb
Market size
Great$868K$868K/yr · 47K searches
Returns
Good2.0%return rate — above 5% kills the launch gate
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Conversion
Okay3.6%search→purchase rate — share of searches ending in a sale
Growth
Okay+4.7%90-day search growth — must beat 0% to launch
Brand share
Bad97%top-5 brand share — brand-locked demand
Competition
Bad93%top-5 click share — a locked-up shelf
Price range
Bad$16.61–$1345.42cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Bad$508.12avg listing price — sweet spot $15–$100
According to Flapen's Amazon United States niche tracking, honda gx390 is a $868K/yr Amazon United States market (47K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 40/100.
Data updated Jul 16, 2026 · scored weekly · How we score niches
honda gx390 market data
- Units sold / yr
- 1K–2K
- avg 100–250/product
- Revenue / yr
- $635K–$762K
- units × avg price
- Conversion rate
- 3.6%
- Avg BSR
- #231
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 86%
- Out of stock
- 0.0%
- Avg brand age
- 47 months
- Avg seller age
- 202 days
Competition & brand share
The top 5 products capture 93% of clicks — a locked-up shelf that new listings rarely crack.Brands
6 falling
Sellers
19
Top-5 brand share
97%
Top 20: 100%
Top-5 click share
93%
Top 20: 100%
Open market
0%
- Honda65%
- SIMPSON12%
- Ruma9%
- 1PZ8%
- Powtol4%
- JJing3%
Demand & seasonality
Weekly Amazon search volume, last 102 weeks — +4.7% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top honda gx390 search terms
- honda gx39018K/yr
- gx3909K/yr
- honda gx390 parts9K/yr
- honda gx390 engine6K/yr
- honda gx 3906K/yr
Top honda gx390 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 7 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Honda GX390 Engine Standard 1 Crank Electric Start GX390UT2XQAE
Honda$922.084.5★67 rev
Simpson 4200 PSI Gas Pressure Washer 4.0 GPM Commercial Power Washer Cold Water Honda GX390 Engine 50 Hose Aluminum Series 49-State Compliant (ALH4240)
SIMPSON$1345.424.2★572 rev
Ruma Adjustable Carburetor Pull Start Recoil Starter Assembly Ignition Coil Kit for Honda GX340 GX390 GX420 11HP 13HP 16HP Engine
Ruma$37.724.5★197 rev
1PZ 2QX-SG6 Recoil Starter Pull Start Replacement for Honda GX340 GX390 GX610 GX620 11hp 13hp 28400-ZEE3-W01ZA Generator Replaces
1PZ$16.614.3★266 rev
Powtol Ruixing GX390 13HP Carburetor for Honda GX 390 Engines Pressure Washer Replace 16100-ZF6-V01 16100-Z5T-901 with 17210-ZE3-505 Air Filter
Powtol$21.114.7★499 rev
Newest
by launch date1PZ 2QX-SG6 Recoil Starter Pull Start Replacement for Honda GX340 GX390 GX610 GX620 11hp 13hp 28400-ZEE3-W01ZA Generator Replaces
1PZ$16.61266 rev
JJing Muffler Carburetor Air Housing Kit for Honda GX340 GX390 GX420 11Hp 13Hp 16Hp Engine Harbor Freight Predator 420cc Engine
JJing$57.0370 rev
Ruma Adjustable Carburetor Pull Start Recoil Starter Assembly Ignition Coil Kit for Honda GX340 GX390 GX420 11HP 13HP 16HP Engine
Ruma$37.72197 rev
Powtol Ruixing GX390 13HP Carburetor for Honda GX 390 Engines Pressure Washer Replace 16100-ZF6-V01 16100-Z5T-901 with 17210-ZE3-505 Air Filter
Powtol$21.11499 rev
Honda GX390 Engine Standard 1 Crank Electric Start GX390UT2XQAE
Honda$922.0867 rev
Trending
90-day click momentumSimpson 4200 PSI Gas Pressure Washer 4.0 GPM Commercial Power Washer Cold Water Honda GX390 Engine 50 Hose Aluminum Series 49-State Compliant (ALH4240)
SIMPSON$1345.424.2★
Simpson PS4240 PowerShot Gas Pressure Washer Powered by Honda GX390 4200 PSI at 4.0 GPM (49 State) 60456
SIMPSON$1156.854.1★
JJing Muffler Carburetor Air Housing Kit for Honda GX340 GX390 GX420 11Hp 13Hp 16Hp Engine Harbor Freight Predator 420cc Engine
JJing$57.034.5★
Ruma Adjustable Carburetor Pull Start Recoil Starter Assembly Ignition Coil Kit for Honda GX340 GX390 GX420 11HP 13HP 16HP Engine
Ruma$37.724.5★
Powtol Ruixing GX390 13HP Carburetor for Honda GX 390 Engines Pressure Washer Replace 16100-ZF6-V01 16100-Z5T-901 with 17210-ZE3-505 Air Filter
Powtol$21.114.7★
What buyers say about honda gx390
What buyers praise and complain about, mined from review topics.What buyers love
“great pressure”
“Machine quality is top notch”
“looks very strong”
“Correct fit”
“Not bad for the price”
“Easy assembly, great product”
“Powerful enough to do any job with a great motor”
“Works perfectly”
“I was pleasantly surprised to see that my box looked like it was brand new”
“Built To Last”
What buyers complain about
“Cheaply Made”
“Would not start”
“Sells a product that breaks within a couple pulls”
“the instructions for set up could be better”
“Overpriced Garbage”
“Does not fit exactly as the old one”
“The machine almost seemed used”
“False advertisement”
“Did not fit not very good missing parts”
“I believe the pump assembly should have been attached to the packaging with the necessary hardware to keep it secured inside the box during transportation”
Top return reasons
Common questions
- Is honda gx390 profitable to sell on Amazon United States?
- The niche generates $868K/yr across 7 tracked products. 90-day search growth is +4.7%. Flapen's verdict: Skip it (40/100).
- How competitive is the honda gx390 niche?
- 6 brands and 19 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 97% of demand.
- What do buyers complain about in honda gx390?
- Top complaints mined from reviews: Quality-Overall, Functionality-Overall, Durability. The return rate is 2.0%.
- When does demand for honda gx390 peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the honda gx390 niche?
- Listings span $16.61–$1345.42; the average listing price is $508.12 (sweet spot $15–$100). The average incumbent carries 447 reviews — the moat a new listing must climb.