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REAR AXLE SPECIFICATIONS
Our continuous testing and research has led us to develop new rear axles which are giving excellent results.
In order to help our customers to better understand the types we presently have, here below please find a list and a short description of the same:
Type F = suitable to solve understeering problems. Harder than the standard type, but very flexible and elastic. Suitable with a lot of rubber on the track and hot conditions. (HRA 55°).
Type C = harder than type F. It gives more grip to the rear. (HRA 62°)
Standard type N = soft type, This is the axle we usually mount on the kart as standard. Good with a little rubber on the track. (HRA 57°).
Type S = softer axle of the range. Suitable when there is a lot of grip on the track and/or when the chassis needs to be very free at the rear (with low-power engine, etc.).
Type F, C and N axles are only available for Ø 40 and Ø 50mm.

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COMMON PROBLEMS

Note: below are some suggestions applicable only and exclusively to Exp chassis; remember that not all chassis perform and react the same way and chassis from other brands may require a total different set-up.

Remember tyres are best when new and could play a key-role in getting your correct set-up !!!

PROBLEM

POSSIBLE CAUSE

REMEDY

The kart does not want to turn into the corners

Understeer – too much rear end grip (the balance is out)

• Move front track out

• Mount the front torsion bar (in chassis where applicable)

• Lift the chassis at the front

• Increase caster

• Move the seat forward

• Mount a softer rear axle

• Check toe out (start with 1-2 mm. in dry conditions and 5/10mm in wet conditions)

The kart does not turn out of the corners

Understeer, too much rear end grip (the balance is out)

• Move front track in

• Mount the front torsion bar (in chassis where applicable)

• Raise chassis at the front

• Lower the chassis at the rear

• Increase caster

• Move the seat forward

• Loosen or remove seat supports

• Mount a softer rear axle

• Check toe out (start with 1-2 mm. in dry conditions and 5/10mm in wet conditions)

• Loosen the bar of the rear bumper

• Lower tyre pressure

The kart slides at the rear (it turns too much at the front)

Oversteer, too much front end grip (the balance is out)

• Mount a harder type axle

• Mount the rear torsion bar

• where applicable, remove the front torsion bar

• Tighten the rear bumper bolt and bar

• Lower the chassis at the front

• Increase pressure of rear tyres

• Slightly move the seat backwards (you can have the opposite result if yu move it too much)

• Decrease caster

The kart slides too much both front and rear

Too little grip

• Mount a harder type axle

• Mount the rear torsion bar

• Mount the front torsion bar (where applicable)

• Tighten the rear bumper bolt and bar

• Raise chassis at the front

• Increase pressure of all tyres

• Raise seat


SUGGESTED SET UP IN RAIN CONDITIONS


- check front toe out
- raise chassis at the front
- increase caster
- move front track out as much as possible
  (with 100cc chassis use front hubs)
- raise seat (in case of heavy rain, 20-30mm.)
- move rear track in
- mount type “N” rear axle
- loosen rear bumper and the rear bumper bar
- loosen the middle axle bearing
- loosen or remove the extra seat supports

Suggestion:
In rain conditions it is usually always better to have little rear end grip (sliding chassis) and a lot of front end grip.