9 KW = 12 HP . Who is stupid enough to believe the given specifications? I would NEVER put one of those engines on any vehicle and certainly not on any aircraft.Ahh, but the Duromax aren't a Chinese company making clones. They are an American company making clones.
Don't believe what you read until you do your own research.
Extracted from the XP18 manual:
Rated Power (KW/rpm)
9.0 kW (18.0 HP) @ 3600 rpm
Compress ratio 8.5 : 1
19.55 ft. lb. @ 2500 rpm
Now, max torque is quoted as 19.55 ftlb. If it still had that much torque at 3600rpm, it would have 13.4hp...