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Symptoms
]I
(Air-fuel mixture blow back to the air cleaner)
B-7 Abnormal running
Fuel consumption is too high.
(Black exhaust gas comes out)
1
I
1
I
Intake/exhaust
valve
Valve opening/
closing timing is
not appropriate.
‘7-I
Air cleaner element
il
Fuel
a
intake valve,
Valve seat
Fitting of
valve seat is
insufficient,
Carburetor
Blinding
__:
2. Clamping failure
(Mixing ratio of air
with the fuel is too
Contaminants exist
‘,
Checking
method
Measure tappet
clearance
Check the bearing
surface
Check the jets
Check the fuel
Check the element
1
If the clearance is
different from the
standard, adjust
the clearance, or
replace the tappet.
Normal :
0.1 +O.O2mm
1. In case the jets
are defective, re-
place them.
2. In case of clamp-
ing failure,
tighten it again.
In case the fitting
of the valve seat is
insufficient, adjust
it or replace the
valve seat.
In case of inappro-
priate fuel, replace
the fuel
Checking
criteria
In case the element
is blind, clean it.
I
I
.A
q
Remedies
/
1 Erii;e or tighten /
Adjust or replace
the intake valve
and the valve seat
Adjust the tappet
clearance, or re-
place the tappet.