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type (UH)
.
Throttle
is controlled by twist grip
and air choke
by hand
lever.
Both
controls are
located on
RlH
side of
handlebar.
STANDARD CARBURETOR SETTINGS
Choke tube dia. 29
mm
.
(1.14")
Throttle
slide
80
Atomizer
265
Main
Jet
120
Pilot
jet
55
Needle
M14,
th
ird
notch from
top.
Floater
14
gr.
Idling screw open 1 •
'·1
/2 turns (see A on
Fig.
69).
IDLING SPEED
ADJUSTMENT
This
adjustment must always be made
on
a hot
engine.
Proceed
as
follows:
1.
Ensure
both adjusting screws are open about
1
-
1·1
/2
turns.
2.
Open
twist grip throttle
to about
1/
4
and start
engine.
3.
Adjust throttle
cables (by means of adjuster
and
nut
on
mixing
chamber cap) to a posi·
tion that both cylinders are firing even and
with the same exhaust pressure.
4.
Release twist
grip and adjust throttle valves
using
adjusters (8) on lop of carburetors to
desired
Idling
speed,
at a position where both
cylinders are
firing
evenly.
5.
Adjust
the idle
screw (A) to obtain the besl
mixture.
After
this adjustment, if
necessary,
readjust
throttle
valves using adjusters (8) to
obtain desired engine speed. If
it
is
neces·
sary to close
the
idle screws (A) completely,
th
is means
that
pilot jets
are too
small
and
othe rs
having
a
larger
orifice
shou ld be fitted
.
If it
is
necessary to open the idle screws mo·
re than
1
·1·1
/2
turns
,
this means
that pilot
jets
are
too
large
and
others
with a
smaller
o rifice should
be fitted
.
Fig
.
69
•
6.
At the end of above operation
recheck
to
en·
sure that both throttle valves are
synch
ro-
nIzed and open at
the
same time.
Remember
to
lock
in position
cable adjusters and
throttl
e
valve stop bolts.
TOP
SPEED ADJUSTMENT
AND
MAIN
JET SELECTION
Adjustment is
made
changing to a
larger
size
main
jet
if
mixture
is too weak and to a smaller
size jet
if
mixture is too rich.
To
determine the
correct size of main
jet
proceed as follows:
1.
If on opening the throttle
the
engine is slow
in picking up speed
and
the
machine
does
not
go faster
or
decelerates and shows a tenden-
cy
to backfire.
and on opening the air lever
there
is some imp rovement, then the
mixture
is too
poor
due to a
too
small main
jet.
In
such case Increase the jet size which wilt
give the best
performance.
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