HPY is used to indicate the horsepower of a given motorcycle. This rating is derived by dividing engine capacity by weight in cubic inches (the equivalent volume unit). For example, on a Honda CBR1000RR Fireblade, an air-cooled engine with 43 c.i.s will have an HPY rating of 1 HP, and for a liquid-cooled engine with 59 c.i.s it will have 2 HP of power output; this means that the motorcycle would be rated at 1 x hp x 2 = 2HP
This information provides users with basic knowledge regarding some terms used to measure bikes/motorcycles' performance and characteristics such as:
1 - Weight (kg) : The total