ENGINE
Decarbonising:
After a few thousands of Kms. of run the carbon. build up in the engine
will
cause general
falling off in power, accompanied by increased fuel consumption and starting trouble.
Decarbonising
will
normally be necessq approximately every
8,000
Kms. and this
can
be
carried out without removing the engine
fiom the frame. The mileage between decarbonising
will vary from machine to machine depending upon the
type of usage.
A
machine used for
frequent short journeys
will
need more attention than one which is used for fast long distance
touring.
1.
Removal of the petrol tank
Close the petrol tap. Disconnect the fuel hose from petrol tap end.
Remove the two studs which holds the petrol
tank
to the frame and
pull
the
tank
upwards.
2.
Removal of
the
Cylinder head
Remove the engine steady eye bolt.
Disconnect the high tension lead from the spark plug. Remove rocker oil pipe.
Remove the exhaust pipe and silencer.
Remove the
air
filter by undoing the bolts on the sides of the
air
filte; body.
Push the carburettor back clear of the studs after removing the
fudng nuts.
Remove the rocker box covers.
Remove the decompressor cable from the lever end of the handle bar
(LH
side)
Crank the engine until both valves are closed. (Keep
in
Compression stroke).
Remove the rocker
CYLINDER
HEAD
arms and bearings
completely after
removing the
four
3
/
1
6".
nuts on each.
Lift
out the push rods
both inlet
&
exhaust.
Remove the six
cylinder head nuts
&
washers.
Lift
the cylinder head
off the barrel, tapping it
genly beneath the
exhaust and inlet ports
with a wooden mallet.
Do Not
tap
the fins.
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