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 machine presenter must
be informed (Reference Introduction Item 10).
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 (or 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 steering linkage: hold the front wheel firmly between your
legs, rock the steering side to side and assess any free play in the linkage
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1. 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).
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