CRG JUNIOR 100CC Guide de dépannage télécharger pdf (Page 19)

Chassis Set Up Procedure

Measuring the Chassis

In order to effectively determine if the chassis is straight, it will be necessary to remove the seat and set

the kart on a stand.

First measure the parallel relationship between the front stub axles and the rear axle (with the wheels

set straight ahead). Measure each side of the kart from the back of the rear axle to both the bottom

and the top of the kingpin bolt. Both sides should be equal.

If these dimensions are not the same, it will then be necessary to “stretch” the side of the chassis that is

shorter. This can be achieved by jacking between the bearing hanger at the rear and the king pin post.

Normally it will be necessary to jack the chassis a little further than the difference, as it will spring back.

However, be cautious and go in small steps to avoid too large an adjustment. It is vital that the kart be

the same length on both sides before attempting further adjustments.

Now check to see if the rear axle is located centrally in the chassis. This is best done by first

measuring from the chassis tubes and then checking the axle diagonally with the tops of the king pins.

This diagonal check is important and will tell you if the chassis runs out of line from center. If the

diagonal check shows up a fault in the chassis, it is best to simply leave the chassis alone and simply

offset the axle slightly to overcome the problem.

Once the chassis is the same length on both sides and the axle is properly centered, it is time to center

the steering with regard to the front hubs being parallel to the rear axle. This is necessary in order for

the kart to steer evenly in both directions and track in a straight line.

First, lock the steering wheel into a straight-ahead position by either using Vise-Grips on the nylon

steering block or (preferably) by using a bungee tie-down from the bottom of the steering wheel to the

rear bumper. Then, by placing a carpenter’s level (or even a long fluorescent light tube) against one

rear wheel, adjust the corresponding front wheel to be exactly parallel to the guide. In effect, the

distance from the front edge of the wheel rim will be identical, compared to the distance at the rear.

Once the first wheel is set (with the steering straight ahead), then set the opposite wheel to zero toe.

This should establish your central reference point. Now if you wanted a total of 3mm toe out (without

the driver), move the front of each wheel out 1.5mm (for a total of 3mm). Now your steering is perfectly

straight and your toe out is set as well.

Progression of Chassis Set Up in the Shop

Measure the chassis front to rear and side to side

Set caster and camber to the recommended settings

Center the steering and set the front wheels straight

Set the toe out

Weigh the kart to be sure the chassis corner weights are correct

Set the front and rear track, ride heights, etc.

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CRG JUNIOR 100CC Guide de dépannage Page 19