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). |
