GO
PISTONS
Clearance
at
skirt
(thrust
faces)
measured
·500"
from
bottom
of
skirt
Gudgeon
pin hole dla.
Compression ratio ...
PISTON
RINGS
Compression
rings
(tapered)
Width
Thickness
Fltt~d
gilp
••
,
Clearance
in
groove
011
control
ring: (Apex 3 piece)
Thickness
Fit
In
groove
·0021/·0015 in. (0·05J3/0·0381
mm.)
·6887/·6885 In. (17'493/17'4879 mm.)
9-5
a·s
(Identified
by
'L' stamped
on
front
engine
lug)
2-729/2-577
mm.
·0625/·0615 In. (1·5875/1·5621 mm.)
·012/·017 In. (0.305/0·432
mm.)
·0035/·0015 In. (0'089/0·038
mm.)
·115
In.
(3-175
mm)
Nominal.
Central spring expander
FUEL
SYSTEM
Triple
carburetters
.•.
Amal
type
•.. •..
Main
let
size
Need e Jet size
Needle
type
•..
Needle position
Throttle
valve ..•
Carburetter
nominal bore size
Air cleaner
element
...
~,
ConcentrIc
626
150
·106
STD
2
4
27
rnm
.
Paper
(special).
PRIMARY DRIVE
AND
GEARSHIFT
CLUTCH
DETAILS
Single diaphragm
spring-release
load
Minimum
travel
to
disengage •..
Allowable
wear
of
friction plate
Pressure
plate bearing (ball)
Operating
lever bearing (ball)
CHAINWHEEL
Thrust
bearing ... '"
;,.;:
..
Needle
roller
bearing (chalnca.se) ...
1,000 Ib,
(approx.)
(453.6 kg.)
'035
In. (·889 mm.)
·06 In. (1,524
mm.)
17 mm. X 40
mm.
X 12 mm.
!"
X
11-"
X
t"
In.
Torrington NTA
2233
1t (shaft) X
It''
X
t"
TRANSMISSiON
(GEARBOX)
To
find
the
gear ratios of a machine, calculate
the
top
gear
as
follows:-
Divide
the
number
of teeth on
the
primary chainwheel by
the
number of teeth on
the
engine
sprocket
and multiply
the
result
by
the
number
of
teeth
on
the
rear
wheel sprocket, divided
by
the
number
of
teeth
on
the
gearbox sprocket,
as
example:-
.,
clutch
sprocket
(43)
engine sprocket
(23)
x
rear
wheel
sprocket
(50)
gearbox
sprocket
(19)
2150
437
4·92
To
find
the
Intermediate gear ratio, multiply
the
overall
top
gear
ratio
by
the
Internal gear ratio concerned,
as
example:-
top
gear
ratio 4·92 X
bottom
gear
Internal
ratio
2·58=12·7
bottom geor
overoll
ratio
loyshoft gear
mOlnshoft
top
geor
Gearbox
Internal ratio
as
example:-
Third
gear Internal ratio
GD4
=
malnshaft gear
(Iayshoft
3rd)
18T
(malnshaft 3rd) 18T
x
x
loyshaft
top
geor
(malnshaft
tOp)
21T
(/oyshoft
top)
15T
1·4
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