Hp vs. KW is the equivalent of standard vs metric.
In europe etc.. They measure using kilowatt rating vs horsepower.
If you research it,KW is a superior measurement for power.
HP is a function of torque,and torque measurement was developed by a guy that measured power by how much his horse could lift like 10lbs 1ft in the air using a rope over a treelimb in x amount of time or some such.
I would have to pull my old book out for the correct/complete story on it,but my opinion is as a measurement torque and hp is basically a joke.
However us americans hate change,so we stick with what we know I guess.
(this is all off the cuff,read up on it for a better,truer,more thorough explanation).
As far as a new engine smoking,i've read of this issue and as the last poster suggested it seems to have something to do with carb flooding due to vacuum or something after shutoff I think.
Be helpful to know what color the smoke is.
Fuel is black,oil is blue and water/coolant is white
Some engines do consume fluids like oil due to design (northstar oil consumption,one of top 10 engines in the world anyway) and some due to design flaws (chrysler pt cruisers-consumers do testing/not engineers).
I'm betting your issue is the latter.
(all this is to be considered opinion-I was a dealer mechanic but am no kind of small engine mechanic.)
Hope something in there helps and isn't just rambling.