The formula that works best only applies to the small newer
normally aspirated (carburetor) 4 cycle engines. The ratios change
slightly worse with altitude and slightly better with fuel
injection and tuning. Most American mowers and the newer 4 cycle
outboard motors fit into one of these two formulas:
Typical new carbureted engine well tuned:
1 x HP per each 25 cc
Fuel injected:
1 x HP per each 22 cc
Notes:
Most engines are tuned down to a lower HP for better engine
life.
It is common for the same cc engine to be built in 3 different
HP versions with the highest rated being the maximized HP per cc
version. That is how you see price and HP changes on the same cc
engine made by the same company.
Some of the newest (2008 and newer) engines from Japan perform
slightly better.
A typical 150cc motor should equate to between 3.5 - 6 HP+
depending on tuning with 5 HP being the adv.
The actual formula plots as a curve and not linear but does not
apply to Max/High Performance engines like motorcycles.

Grams and kilograms are not weights and they're not forces.
They're masses.
On Earth, 1kg of mass weighs 9.81 newtons.
On Earth, 1 newton is the weight of about 0.102 kilogram of
mass.
On the moon, the same 1 kg of mass weighs 1.62 newtons.
On the moon, 1 newton is the weight of about 0.616 kg of
mass.
On Mars, the same 1 kg of mass weighs 3.722 newtons.
On Mars, 1 newton is the weight of about 0.269 kg of mass.
1 N = 0.102 Kg. OR 1N=0.224 pound (Imperial)
1 KN (KiloNewton) = 102 Kg.

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