EASYKART:
THE ADJUSTMENTS |
THE STANDARD SET-UP AND ITS MAIN
VARIATIONS - EASYKART 60
Front set-up: the ideal track is with
2-cm spacers positioned inside the rim, zero convergence
and a low chassis;
Rear set-up: the height of the axle is fixed, while the
ideal track varies between 109 and 110 cm;
Seat: From the front crossbar of the chassis the seat must
measure 49.5 cm on the left side, 50.5 cm on the right side,
and the distance between the top of the seat back and the
axle must measure 22 cm;
Tyres: The 60cc class uses Bridgestone YGL tyres. The compound
is medium-hard and offers a constant performance for over
250 km (an average of 300 laps on a track of the approved
A type). Pressure has to be set between 0.7 and 1.5 bar
depending on the air temperature and the asphalt. The distance
to be covered must be assessed as well: for short ”runs”
as for instance during qualifiers, a higher pressure can
be selected, whereas the higher the distance to cover during
the race, the more the pressure can be lowered, so as an
effective performance towards the end of the race can be
achieved.
Exhaust pipe length: on average, the length between the
header end at the cylinder and the end of the cone on the
expansion chamber must measure 42.5 cm, taking into account
that a longer pipe favours low-speed running, a shorter
one high-speed running. Therefore, one can shorten or lengthen
the header to optimise the performance based on the track
shape.
Carburetion : according to regulations, the available jet
sizes are 73 – 74 – 76 – 77 . Usually,
the 74 size is employed with the air screw turned by a ¼
turn.
In winter, the air is denser and, therefore, we recommend
loosening the carburettor screw a bit further.
Mixture: In competitions, considering that the motor can
run at a relatively low number of revolutions, a 4% mixture
is used. With amateurs, a slightly richer mixture can be
used. We recommend you use Shell super M oil or an oil of
the same quality.
It is a useful to always empty the tank after races and
practice days, without reusing the old mixture.
Gear ratio: in competitions, the number of the cogs on
the crown wheel is set by the organisation to an extent
varying between 76 and 84 cogs.
The pinion, instead, has to have strictly 10 cogs. Generally
speaking, the gear with less cogs has less pick-up exiting
a bend, but allows more speed on fast stretches. The gear
with more cogs has the opposite effect. By virtue of this
rule, which does not enable them to select a certain gear
in order to have a greater acceleration, heavier drivers
have to adjust to a “cleaner” way of driving,
and must avoid forcing by means of borderline braking and
taking advantage of the track to speed up as soon as possible.
Chain: the chain is among the mechanical parts subject
to the greatest wear. It is very important to properly grease
it with quality products immediately on entering the track.
The grease must reach the contact point between the link
and the gear. It is also useful to check alignment (there
are specific tools, but an approximately 20 cm long bar
is usually sufficient) and tension frequently: the chain
should always have a minimum play (about 1cm perpendicularly
to the chain itself) and should never be too taut.
