A
modification to steering geometry is not
in itself a reason for rejection.
Before failing a machine for excessively stiff steering,
check that any adjustable steering damper is released. The
tester may at his discretion consider that a road test is
necessary to establish whether stability or control is adversely
affected. If the damper is released during the test the
vehicle presenter must be informed (Reference Introduction
Item 5).
It is important to distinguish between play in the head
bearings and that in the forks, it may be necessary to use
the assistant to apply the brake whilst the machine is pushed
so that a proper assessment can be made by hand and eye.
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Check
that the steering head bearings are adjusted correctly and
are in good condition as follows:
1. Inspect for tightness and roughness by turning the steering
from lock to lock
a. with the front wheel on the ground for on a turning plate)
to check the lower bearing, and
b. with the machine raised so that the front wheel is clear
of the ground to check the upper bearing.
2. Inspect for free play as follows;
a. apply the front brake and push the handlebars forward,
or
b. for lightweight machines, with the aid of an assistant
raise the front wheel clear of the ground, apply the front
brake, and lift the front of the front wheel, it may be
necessary to support the centre of the machine if it does
not have a suitable stand).
c. for machines with centre hub steering:
with the front wheel held between your legs rock the steering
side to side taking up the play. Assess the free play in
the linkage.
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I.
Steering movement excessively stiff, 'notchy' or rough (see
information column).
a. with weight on the lower bearing,
b. with the wheel raised.
2. Excessive free play in the head bearings or any steering
linkage (see information column). |
