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Fault finding
REF.7
8 Excessive exhaust smoke
White/blue smoke (oil burning)
Float needle valve held off seat. Clean any sediment from the float
I J Oil pump cable adjustment incorrect. Check throttle cable/oil
chamber and fuel line and renew the needle and seat if necessary
pump cable adiustment on models with a cable-operated pumD
(Chapter 4).
.
.
(chapter 1).
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B f o ~ n smoke (lean mixture)
Accumulated oil deposits in the exhaust system. If the scooter is
, ,
Main jet too small or blocked. Clean float chamber and jet and
used for short journeys only, the oil residue from the exhaust
compare jet size to Specifications (Chapter 4).
gases will condense in the cool silencer. Take the scooter for a
, ,
Fuel flow insufficient. Float needle valve stuck closed due to
long run to bum off the accumulated oil residue.
chemical reaction with old fuel.
Black smoke (over-rich mixture)
Restricted fuel supply due to blockage or trapped hose. Clean
IJ
Air filter clogged. Clean or renew the element (Chapter 1).
hose and float chamber.
Main jet too large or loose. Compare the jet size to the
Carburettor inlet manifold loose (Chapter 4).
Specifications (Chapter 4).
Air filter poorly sealed or not installed (Chapter 1).
Automatic choke faulty (Chapter 4).
Ignition timing incorrect (Chapter 5).
9 Poor handling or stability
Handlebar hard to turn
I J
Steering head bearing adjuster nut too tight. Check adjustment as
described in Chapter 6.
Bearings damaged. Roughness can be felt as the bars are turned
from side-to-side. Renew bearings and races (Chapter 6).
Races dented or worn. Denting results from wear in only one
position (e.g. straight-ahead), or from an accident. Renew races
and bearings (Chapter 6).
Steering stem lubrication inadequate. Causes are grease getting
hard from age or being washed out by high pressure car washes.
Disassemble steering head and repack bearings (Chapter 6).
Steering stem bent. Caused by an accident. Renew the steering
stem
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don't try to straighten it (Chapter 6).
Front tyre air pressure too low (Daily (pre-ride) checks).
Handlebar shakes or vibrates excessively
Tyres wom (Daily (pre-ride) checks).
Suspension components worn. Renew worn parts (Chapter 6).
Wheel rim(s) warped or damaged. Inspect wheels for runout
(Chapter 8).
Wheel bearings worn. Worn wheel or hub (front) or transmission
bearings (rear) can cause poor stability in a straight line. Worn
front bearings will cause steering wobble (Chapter 8).
Handlebar mounting loose (Chapter 6).
Front suspension bolts loose. Tighten them to the specified torque
(Chapter 6).
Engine mounting bolts loose. Will cause excessive vibration with
increased engine rpm (Chapter 2A or 28).
Handlebar pulls to one side
Frame bent. Definitely suspect this if the machine has been in an
accident. May or may not be accompanied by cracking near the
bend. Renew the frame (Chapter 6).
Wheels out of alignment. Caused by damaged wheel bearings,
bent steering stem, fork tube (telescopic fork models) or frame
(Chapter 6 or 8).
Steering stem bent. Caused by an accident. Renew the steering
stem -don't try to straighten it (Chapter 6).
Fork tube bent (telescopic fork models). Disassemble the forks
and renew the damaged parts (Chapter 6).
Poor shock absorbing qualities
Too hard:
a) Telescopic fork oil quantity excessive. See the Specifications in
Chapter 6.
b) Telescopic fork oil viscosity too high. See the Specifications in
Chapter 6.
c) Telescopic fork internal damage. See Chapter 6.
d ) Fork tube or shock absoher bent. Causes harsh movement or
suspension to stick (Chapter 6).
e ) Shock intemal damage (Chapter 6).
f )
Tyre pressure too high (Chapter 1 ) .
Too soft:
a ) Fork oil viscosity too light. Use the c o m t grade (see the
Specifications in Chapter 6).
b) Fork or shock spring(s) weak or broken (Chapter 6).
c) Shock internal damage or leakage (Chapter 6).
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