Section J6 - Royal Enfield METEOR MINOR STANDARD 1958 Workshop Maintenance Manual

With Casquette and Aluminium Alloy Bottom Tubes
1. Description
The telescopic fork consists of two legs each
of which comprises a main tube of chrome
molybdenum alloy steel tubing which is screwed
into the Casquette fork head at the upper end and
securely clamped to the fork crown. Fitted over
the lower end of the main tube is the bottom tube
made of high strength aluminium alloy with an
integral lug which carries the wheel spindle.
Fitted on the lower end of the main tube is a steel
bush which is a close fit in the bore of the bottom
tube. The upper end of the bottom tube carries a
bronze bush which is a close fit over the outside
diameter of the main tube. The bush is secured to
the bottom tube by means of a threaded housing
which contains an oil seal. A stud known as the
"spring stud" is fitted in the lower end of the
bottom tube and a valve port is secured to the
lower end of the main tube. As the fork operates
oil is forced between the spring stud and the bore
of the valve port forming a hydraulic damping
system. A compression spring is fitted inside the
main tube between the upper end of the spring
stud and the upper end of the main tube. The
lower end of the main tube and upper end of the
bottom tube are protected by a cover secured to
the fork crown.
2. Operation of the Fork
The fork provides a range of movement of 6
in. from the fully extended to the fully
compressed position.
controlled by the compression spring and by the
hydraulic damping system. The hydraulic
damping is light on the bump stroke and heavier
on the rebound stroke, thus damping out any
tendency to pitching or oscillation without
interfering unduly with the free movement of the
fork when the wheel encounters an obstacle.
The fork is filled with a light oil (S.A.E. 20)
to a point above the lower end of the spring so
that the damper chamber "B" is always kept full
of oil. Upward movement of the wheel spindle
forces oil from the lower chamber "A" through
the annular space between the spring stud
(38067) and the bore of the main tube valve port
(38138) into the damper chamber "B."

SECTION J6

Front Fork
The movement is
B
A
Section J6 Page 1