ql78yc marine spark plug
Worth a lookShows demand growing +175.7% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Growth
Incredible+175.7%90-day search growth — must beat 0% to launch
Conversion
Incredible14.1%search→purchase rate — share of searches ending in a sale
Avg price
Incredible$23.17avg listing price — sweet spot $15–$100
Price range
Incredible$16.65–$31.76cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Great115.44avg incumbent reviews — the moat a new listing must climb
Returns
Great1.5%return rate — above 5% kills the launch gate
Quality gap
Great4.2★avg incumbent rating — lower means beatable quality
Brand share
Bad95%top-5 brand share — brand-locked demand
Market size
Bad$35K$35K/yr · 11K searches
Competition
Bad90%top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, ql78yc marine spark plug is a $35K/yr Amazon United States market (11K searches/yr). The top 5 brands hold 95% of demand. Verdict: Worth a look — 59/100.
Data updated Jul 11, 2026 · scored weekly · How we score niches
ql78yc marine spark plug market data
- Units sold / yr
- 2K–2K
- avg 100–250/product
- Revenue / yr
- $35K–$46K
- units × avg price
- Conversion rate
- 14.1%
- Avg BSR
- #1,166
- Page quality
- 0%
- Prime
- 78%
- Sponsored
- 89%
- Out of stock
- 14.0%
- Avg brand age
- 41 months
- Avg seller age
- 184 days
Competition & brand share
The top 5 products capture 90% of clicks — a locked-up shelf that new listings rarely crack.Brands
7 rising
Sellers
27
Top-5 brand share
95%
Top 20: 100%
Top-5 click share
90%
Top 20: 100%
Open market
2%
- Champion53%
- MEILAN30%
- yeeluzan6%
- BDFHYK3%
- UMONIE3%
- SYKRSS3%
- Open — no brand owns it (1 brand, 2%)
Top ql78yc marine spark plug search terms
- ql78yc marine spark plug5K/yr
- ql78yc3K/yr
- champion ql78yc3K/yr
Top ql78yc marine spark plug 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 9 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Champion QL78YC Spark Plug Pack of 4
Champion$18.544.7★438 rev
SPARK PLUGS 6 PACK MARINE ENGINES 24 QL78YC 938M OUTBOARDS INBOARD I/O CHAMPION
MEILAN$29.674.7★188 rev
Champion QL78YC (938M) Marine 8 Pack
Champion$31.764.6★200 rev
8PCS Iridium Spark Plugs Fit for Johnson Evinrude Mercury Marine Outboard Engines Replacement for QL78YC 938M
yeeluzan$22.654.2★9 rev
BDFHYK QL78YC Iridium Spark Plugs Compatible with Mercury Evinrude Johnson Mariner OMC Set of 4
BDFHYK$16.654.4★17 rev
Newest
by launch date
SYKRSS QL78YC Marine Spark Plugs 4 Pack - Compatible with Mercury/Mariner EFI Evinrude 10-225HP (1973-2001) Johnson 10E-90HP (1974-2005) - Replaces QL77JC4 for 2/4-Stroke Outboard Motors
SYKRSS$16.71157 rev
8PCS Iridium Spark Plugs Fit for Johnson Evinrude Mercury Marine Outboard Engines Replacement for QL78YC 938M
yeeluzan$22.659 rev
8 Pack ql78yc marine spark plug - 938M Replacement for champion ql78yc Compatible with Johnson Evinrude Mercury Marine Engines (Outboard/Inboard) Replaces BPZ8HS10 Wont fit Ford 150
UMONIE$21.539 rev
BDFHYK QL78YC Iridium Spark Plugs Compatible with Mercury Evinrude Johnson Mariner OMC Set of 4
BDFHYK$16.6517 rev
YUXIVCNE 6 Pack Spark Plugs QL78YC 938M Replacement for Johnson Evinrude for Mercury Outboards Inboard Marine Engines Parts Replace BPZ8HS10
YUXIVCNE$22.6311 rev
Trending
90-day click momentum
Champion QL78C L78C BH8S (807M) Marine 8 Pack
Champion$28.423.3★
8PCS Iridium Spark Plugs Fit for Johnson Evinrude Mercury Marine Outboard Engines Replacement for QL78YC 938M
yeeluzan$22.654.2★
Champion QL78YC Spark Plug Pack of 4
Champion$18.544.7★
SYKRSS QL78YC Marine Spark Plugs 4 Pack - Compatible with Mercury/Mariner EFI Evinrude 10-225HP (1973-2001) Johnson 10E-90HP (1974-2005) - Replaces QL77JC4 for 2/4-Stroke Outboard Motors
SYKRSS$16.714.2★
SPARK PLUGS 6 PACK MARINE ENGINES 24 QL78YC 938M OUTBOARDS INBOARD I/O CHAMPION
MEILAN$29.674.7★
What buyers say about ql78yc marine spark plug
What buyers praise and complain about, mined from review topics.What buyers love
“Works well”
“ordered twice priced well”
“Great product”
“Just what I needed”
“motor runs better then the plugs that were in it”
“spark plugs worked just fine as well as the spark plug wires”
What buyers complain about
“They weren't very efficient”
“These plugs are not the plugs meant for the boat motor we entered”
Top return reasons
Common questions
- Is ql78yc marine spark plug profitable to sell on Amazon United States?
- The niche generates $35K/yr across 9 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +175.7%. Flapen's verdict: Worth a look (59/100).
- How competitive is the ql78yc marine spark plug niche?
- 7 brands and 27 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 95% of demand.
- What do buyers complain about in ql78yc marine spark plug?
- Top complaints mined from reviews: Functionality-Overall, Socket/Port/Plug. The return rate is 1.5%.
- What does it cost to enter the ql78yc marine spark plug niche?
- Listings span $16.65–$31.76; the average listing price is $23.17 (sweet spot $15–$100). The average incumbent carries 115 reviews — the moat a new listing must climb.