8-2-4
MAIN
SYSTEM
1) Remove the bolt (12) and take out float chamber body
(10).
2)
Remove the main jet (1
3)
from the body
(6).
3)
Reassembly
a) Fasten the main jet securely to the body. Otherwise the fuel may become too rich and cause engine
b) The bolt tightening torque
is
70
kg-cm.
malfunction.
8-2-5
FLOAT
SYSTEM
Pull out the float pin
(9)
and remove the
float
(8)
and needle valve
(1
7).
If
the
needle valve need be re-
placed, replace it with rubber needle.
Caution: When cleaning the jets, use neither
a
drill nor
a
wire (because of possible damage of the orifice
which will adversely affect fuel flow). Be sure to use compressed air
to
blow them clean.
When removing the needle valve and floats, gently tap the reverse side using the rod more slender than
the float pin and remove because the float pin is calked to the carburetor body.
BREAK-IN OPERATION
of
REASSEMBLED ENGINE
An overhauled engine must be operated at low speed break-in the parts.
A
thorough break-in is indispensable
particularly when the cylinder, piston, piston rings or
valves
are replaced with new ones.
The recommended break-in schedule
is
shown below.
/-
I
LOAD
SPEED
(Crankshafr
Rev.)
TIME
I
2,500
rpm
10
minutes
NO
LOAD
3,000
rpm
10
minutes
NO
LOAD
30
minutes
3,600
rpm
0.7
PS
10
minutes
3,600
rpm
1.4
PS
60
minutes
3,600
rpm
-
28
-
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