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74
V
11
10 Frame assembly: examination and renovation
1
If the machine is stripped for a complete overhaul, this
affords a good opportunity to inspect the frame for cracks or
other damage which may have occurred in service. Check the
front downtube immediately below the steering head and the
top tube immediately behind the steering head, the two points
where fractures are most likely to occur. The straightness of the
tubes concerned will show whether the machine has been
involved in a previous accident.
2
If the frame is broken or bent, professional attention is
required. Repairs of this nature should be entrusted to a com-
petent repair specialist, who will have available all the
necessary jigs and mandrels to achieve correct alignment.
Repair work of this nature can prove expensive and it is always
worthwhile checking whether a good replacement frame of
identical type can be obtained from a breaker or through any
form of Service Exchange Scheme. The latter course of action is
preferable because there is no safe means of assessing on the
spot whether a secondhand frame is accident damaged too.
9.4 Refill fork legs with oil
Chapter 4 Frame and forks
1
To check for wear in the swinging arm bushes, hold the
frame firmly in one hand and with the other, shake the rear
wheel. There should not be any side play at all; if there is,
replacement of the swinging arm pivot bearings may be
necessary.
2
Remove the rear wheel assembly as described in Chapter 5
and disconnect the chain, but do not pull it right off. Leave it on
the gearbox sprocket.
3
Remove the two rear suspension units from their lower
locating points and then remove the chainguard.
4
Undo the large nut on the end of the swinging arm pivot
shaft and pull out the shaft whilst supporting the swinging arm
in the other hand.
5
To replace the bushes a press is necessary with a few good
fitting pieces of short tube. A vice clamped rigidly to a work-
bench will often suffice, if a fly-press is not available.
6
Position one piece of tube to support the swinging arm and
line up another against the bush that has the same outside
diameter in a vice fitted with soft jaws. Close the vice, using the
tube to press the old bush out of position. Use the same method
to press the new bush into position and when both have been
renewed, reassemble in the reverse order of dismantling. Do not
forget to replace and retighten the rear brake torque arm.
Grease the pivot shaft, refit it from left to right and tighten the
securing nut to a torque setting of 3.5 — 4.5 kgf m (25 — 32.5
V
9.7 Bounce forks before final tightening of securing bolts
Fig. 4.3 Frame - component parts
7
Clamp
2
Wiring clip
3
Frame
Front engine plate
4
Right-hand head steady plate
5
Left-hand head steady plate
6
7
Frame identification plate
8
Screw
9
Nut
10
11
Nut- 10 off
Washer
12
Washer- 11 off
Spring washer— 6 off
14
off
15
Bolt -2 off
16
off
17
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