Beta RR 4T-400 Workshop Manual page 163

Installation
NOTE: Fins 46 and piston 45 determine the compression damp-
ing. If necessary, the behaviour of the fork during the compres-
sion phase can be altered by replacing fins 46 and piston 45
with other parts having different characteristics.
Only use genuine Betamotor fins and pistons. Do not
modify the components.
– If necessary replace piston O-ring 44.
– Insert in succession compression fin or fin stack 46, piston 45
complete with O-ring 44, fin 43 and spring 33 in the foot valve.
The piston should be oriented so that the smaller holes
face adjusting fins 45.
– Manually screw in nut 42.
– Clamp in a vice the foot screw through spanner slot 47.
– Using a 13-mm spanner, tighten nut 42 to the prescribed
torque (see table in Chapter 3 Tightening torques - Specifica-
tions - Recommended products).
Reassembling the fork leg and the sheath - Fitting the seal
rings
Never reuse any removed seal rings and wiper seals. Be-
fore reassembly, check the condition of the guide bush-
es. If they are scored or scratched, replace them. Ensure
that the Teflon lining of the guide bushes is intact.
– Cover the seat of the upper bush by applying adhesive tape to
the end of the fork leg.
– Apply a thin film of grease to the wiper seal and the seal ring.
– Insert the following parts in succession into the fork leg: wiper
seal 12, retaining ring 11, seal ring 10, cup 9 and lower guide
bush 8.
Pay attention to the orientation of seal ring 10: fit it so that
its hollow side faces cup 9.
8 - Front suspension / wheel
Release 01 Date 09/2007
44
8
9
10
11
12
33
43
45
46
42
47
13