Specifications

Chapter 7 The 1985 on models
113
machine so that the brake components can then be dismantled,
cleaned, checked for wear, and reassembled. It is important that
moving parts such as the brake camshaft are lubricated with a
smear of high melting-point grease on reassembly.
6 Routine maintenance: checking the side stand
1 Examine the side stand for cracks or bending, and lubricate
the pivot with a multi-purpose or graphited grease." The side
stand pivots about a single shouldered bolt; check that its
retaining nut is securely fastened. Check the return spring and
renew it, if weak or strained; if the pivot is correctly lubricated
and the spring sufficiently strong, a pull of 2 — 3 kg (4.4 — 6.6
Ib) as measured with a spring balance hooked on to the stand
foot, should be required to retract the stand when it is in the
down' position (machine supported on centre stand).
2 Inspect the rubber pad on the side stand for wear. If it is
worn down to or past the wear mark, it should be renewed.
Renew with a pad marked Below 259 Ib only'.
7 Compression test: all models
1 At regular intervals it is useful to check the compression
pressure to gain some idea of the degree of engine wear that
has taken place; if engine performance is faulty the compression
test can be a useful diagnostic aid.
2 Engine compression pressure is tested using a compression
gauge with an adaptor suitable for a 1 2 mm spark plug thread.
The engine must be fully warmed up, with the valve clearances
accurately set and all cylinder head retaining nuts tightened to
the correct torque settings. Open fully the throttle twistgrip and
turn the engine over several times with the kickstart, noting the
values recorded by the gauge.
3 If the readings obtained are significantly lower than those
specified in Chapter 1, the engine is excessively worn and must
be stripped for repair. The areas of wear are the piston/cylinder
group, the head gasket, or the valves. The piston/cylinder group
can be checked by removing the gauge, pouring a small amount
of oil into the cylinder bore, then repeating the test. If the
pressure recorded is significantly increased, the piston, piston
rings or cylinder barrel are at fault; if the pressure remains
unchanged, the head gasket or valves are faulty.
4 In the rare event of a pressure being recorded that is higher
than that specified, this ca"n be due only to an excessive build-
up of carbon in the combustion chamber, which must be
removed to restore full engine performance. However since it is
extremely unlikely that an engine will run for long enough to
build up such excessive deposits without a proportionate
amount of mechanical wear taking place, the cause of such an
excessive build-up must be established and rectified.
8 Engine modifications: general
1 Chapter 1, Section 6 mentions two special Honda service
tools which are required during the dismantling and reassembly
of the engine. Note that the part numbers are changed for these
later models. The centrifugal oil filter nut peg spanner is now
07716 - 0020100, and must be used with handle/extension
bar 0771 6 - 0020500. Alternatively a similar tool can easily be
fabricated as described in Chapter 1. The generator rotor
flywheel puller is now 07733 -0010000. Owners should note,
however, that much cheaper pattern versions of this puller are
available which will fit Brazilian- and Japanese-built machines;
these pullers will fit nearly all modern small-capacity Japanese
6.2 Side stand rubber pad must be
renewed when worn to limit mark
shown by arrow
8.1a Manufacturer's special tools can be 8.1b ... or by proprietary pattern versions
replaced by home-made items as such as the flywheel puller shown
shown ...
.A / i
8.3a Note slightly modified clutch
release arm - extract roll pin to permit
removal
8.3b Clutch pushrod is now in one
piece
11.1 Petrol tank rear mounting is
secured by a single bolt