Superkart manufacturers produce specific
125cc chassis designed to cope with the far higher speeds, greater weight
and far more powerful engines than their sprintkart cousins!
Due to the much higher speeds and
kart/driver weight than sprintkarts, 125cc Superkarts are often fitted with
aerodynamic aids such as rear wings and full bodywork!
The 125cc class is almost free of
any technical regulations other than minimum kart/driver weights and some
dimensional requirements. 4 wheel disc brakes are a requirement in this class
There are few karts around
now powered by Moto-X bike engines and still
competing. These engines are in a much lower
state of tune and the gearbox ratios do no suit
well the extreme state of tune that makes a
competitive 125cc Gearbox kart.
Honda RS 125cc GP
motorcycle engines seem to be the predominant engine in this class, however
older Rotax 125cc and TZ Yamaha 125cc engines occasionally appear. These little
purpose made racing engines sing away at around 13500rpm and produce around 45
bhp through a 6 speed gearbox! The engines are in an extreme state of tune and
require careful tuning and preventative maintenance, however being designed for
the rigours of motorcycle road racing, are
surprisingly reliable when fitted to a superkart, and with common sense will run for many
kilometers between major rebuilds!
All engine modifications are allowed and due
to the widespread use of Grand Prix motorcycle type engines, this class of kart probably
suits the more technically minded competitor.
125cc superkarts can be had for as
little as $2500 for entry level and around $4500 for a reasonable machine.
to $15000 gets you the latest and best of everything!
125cc Superkarts are identified by
racing numbers on a red background.