CRG JUNIOR 100CC Guide de dépannage télécharger pdf (Page 20)

Progression of Tuning at the Track

While there are many different ways to troubleshoot a chassis handling on the track, the essence of

what you’re trying to do is just simply figure out where the chassis is lacking. In other words, are you

having to “wait” for it or adjust your driving to make up for something the chassis is doing (or not

doing)? When testing at the track, one method of determining this is to drive a corner as fast as you

can and then ask yourself what is keeping you from going through the corner faster (besides you).

Careful thought will normally help you determine if the kart is sliding in the front (understeer), sliding in

the rear (oversteer), hopping, etc… Once you know what the problem is, you can begin solving it.

In general, start with an axle that you feel will work (given the track conditions). Use medium hubs and

set the rear track width in the middle of the proper range. Then change track width to adjust for

oversteer, understeer or hopping. As you reach the limit of the rear track adjustment, switch hubs and

go back to the center of the track width range for more testing with the front end settings.

Never change more than one item as a time or you won’t know what is helping or hurting your setup!

The following are the most common adjustments at the track:

Tire pressures

Reposition weight (seat or lead ballast weight)

Adjust Frame stiffness (add/remove torsion bars, 4

rails, seat struts, etc…)

Adjust front and/or rear track

Adjust ride height

Change rear hubs

Softer or stiffer wheels

Proper record keeping is critical. Write down every change so you can refer back to your base settings

if your changes are not helping.

Maintenance

First, pull every bearing and moving part off the chassis. Then, thoroughly clean and oil where

necessary. Make sure each moving part is in good condition and if it appears compromised, replace it.

Aerosol white lithium grease is excellent for rear bearings. It is sometimes desirable to remove the

debris shields on the bearings to ease maintenance.

Make sure that all king pins bearings are fitted properly and not worn. The same applies to steering

shaft bearings, tie rod ends and wheel bearings. Check the kart for any cracks and repair where

necessary. Then reassemble using new Nylock nuts throughout.

Finally, you must be certain the rear axle, brake disc and the front wheels all run free. Wheel balance

is also important, although fronts are a bit more critical than the rears.

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CRG JUNIOR 100CC Guide de dépannage Page 20