125cc Shifter Karts

If you've ever rented a go-kart, this is nothing like that.  To give you an idea of comparison, any rental kart you've rented, likely had a 5Hp, 4 Stroke engine (Either Briggs & Stratton, or possibly Honda).  For rental purposes, they usually govern them down to 3.5 HP.

The next class of karts are 4-Stroke Racing Karts.  These come stock with 8HP, though racers are usually known try to squeeze them closer to 10 or 11 HP.

Then you move to 2 Strokes.  A single cylinder 2-Stroke kart with a centrifugal clutch, is producing 18 to 22 HP.

After that, you look to karts with transmissions.    A Kart called a DD2 has a high-speed/low-speed paddle shift, and they are known to generate anywhere from 35-38HP.

Then come the big guns.  16,000 RPM, 6 speed transmission, and 48 to 51 HP.  Shifter Karts are the undisputed kings of karting.  We're capable of pulling 3G in a corner!!  They can go through corners so quickly, we need carbon fibre rib protectors to minimize broken / bruised ribs.  

If 50 HP sounds a little boring, let's do a little power-to-weight ratio math.  50 HP in a 165 lb vehicle, has a ratio of 3.3lb per HP.  To get the same power to weight ratio from a 3530 lb Ferrari 599, it'd need to make 1070HP and never lose traction.  A Skyline G-TR would need 1160HP.