MOTO GUZZI Stornello sportcc User manual

STORNEllO SPORI
125 cc
RIDER'S HANDBOOK
s " ( l lllil 110111. OIL

MOTO GUZZI
SOCIETA PER AZIONI
STAB ILlMENt O E AMMINISTRAZIONE : Mandello del Lario (C o mo)
Via Emanuele V. Parodi, 57
Te l efoni: Mandello L ar io 71 .112 (4 linee con ri ce r ca automa t! ca )
Le eco 22.691
Collegamento ponte-radio co n Mi lano e Genova
Tel
egrammi: Motoguzzi - Mande llo Lario
SEDE LE GA LE : Mi l an o Vi a D urini N. 28
Telefoni : 705 . 784 - 705.785 -Tele grammi: Motoguzzi Milano
FI L IALE - CEN T RO R I CAMBI
Mi lano (640) -Via Giovanni da ' p,r-C;it ida, 14
Tel efoni: . <8 41.421 /34 1. 296/38 1 .997/384 . 033
Telegr .: Filialmotogu zz i - Milano
UFFICI : Genova -C.so Aurelio Saffi, 29
Telefoni : 55.242/55 . 243/55.244/55 . 245
T elegrammi: Peromer • G nova
Ro ma • Via Barberlnl, S6 . Telefono 484.758
T elegremml: Motoguzzi - Roma
Napoli -Piazza Municipio, 84 -Telefono 310 .581
Tel egrammi: Motoguzzi -Napoli
Torino -Corso Unione Sovietica, 70 -T elefono 500. 173
Tel egrammi: Motoguzzi - T or ino
STORNEllO SPORT
125
cc

TOOL KIT
Allen wr ench , oil drain cap:
Screwdriver .
Spanner, tapp et ad ju stmen t
Double
ended spanner 8-10 mm .
Double
ended box spanner 14 -17 mm.
Spanner , h exagona l grooved cy li ndriCal head icrews.
Plug sp ann er, 19 -21-22 mm., box.
Tyre levers,
2.
Tyre inflator .
Instru ction booklet.
ENGINE AND FRAME NUMBERS
E c:h machine has a sing le seri al number for both frame
and engine . This number is stamped on the right down tube
of the frame and on the front crankcase cover. It is the
only numb er valid for e ll $elling end legal purposes and it
app ears also in th e certlfleete of . origin and the circu lation
boo k.
This number should always be referred to when orde ring
spa re parts .

INDEX
Control s and accessories Page 9
General characteristics
» 10
Maintenance
instructions
» 14
f=uel
taps
»
14
Ignition
key » 14
Starting
the engine 15
Racing th e e ngin e 16
Starting
the mo t or cycle
16
Use of gear box » 16
Stopping the
machine
»
17
Stopping the engin e
17
Inspection
»
18
Storing th e m
achIne
»
18
Carburat ion
fau l ts end
cures
»
18
Ignition fault s and c ur es
18
Loss of compressi on
19
Overheating
19
III use of machine »
20
Running in
20
Important notice »
20
Table
for peri od i ca l
maintenance 21
Lubrication of engin e
gear-box unit 23
Centrifugal filter
»
26
Chain lubrication
»
27
Telescopic
fr ' ont fork
» 28
Carburettor
»
31

Cleaning
of silencer Page 35
Valve
timing » 35
Ignition
timing
»
38
Igniti on
»
38
Spark
plug
» 40
Cylinder h ead and val ves
»
40
Ta ppet adjustm en t » 41
Clutch adjus tme nt
» 41
Steering h ead adjustment
» 41
Chain
adjustment
»
43
Adju stment
of h and l bar
contro ls
»
44
Fr ont brllke
ad ju stment
"
44
Adju stment of rear brak e »
44
Removel
of
fron t wh ee l 44
R emove l
of rear whee l » 46
Electrical e qui pmen t » 47
Wiring diagram
»
47
Headlalllp » 47
Changing
bulbs end
fuses
»
47
Battery
»
47
Horn and dipper switch
» 52
Elec tric
horn
"
52
Cab l es
»
52
Genera l
maintenance
»
52
Re-to uch ing
paint
work
» 53
Tran sfe rs »
53
H ome co nce ss iona ires
»
54
C oncess ionai r es abro ad
» 61

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Fig . 4 . Controls and accessories

CONTROLS and ACCESSORIES
(see fig. 4)
Gr e en lamp for city light s.
2
Ignition key, engine starting , electrical equipment, and
lighting system .
3 Clutch
control l ever
4 Dip switch and electric horn b utton
5 P etrol fi Il er cap
6 Rear brak e peda l
7
Ki cks tarter
8 R ear su spe nsion and hydrau lic sh oc k abs o rbe rs
9
Speedometer
10 - Fr on ·t brak e lev er
11 Twist gr ip th r ot tl e control
12 Gear lev er
13 Silencer
14 - Rear lam p for plate illuminati on an d st op light
N.B. -In the text the ter ms right and left are used in
the sen se they wo uld appear to one s itting in
the saddle .
9

Eng i ne
GENERAL CHARACTERISTICS
ENGINE
Single cyl inder f our stroke, O.H.V.
Cylinder
In lig ht alloy with special cast iron inser t ed l iner, 25" incli-
n ation .
Cylinder he d
In l ight a ll oy with valve gear runn ing in
Valve r
opera t ion
Pu sh rod and rockers.
Stroke
Bore
Swept vol ume
R tlng
Output
Compress ion ratio
Ignition
o il bath .
6 V -
:28 W ~ ywh I a lt e rn ator with remote H.T. coil.
58 mm.
52 m m.
125 cc.
2 HP
8.5 HP
9.8 to 1
N.B. - Make sure the ba tt er y I. alway. on whilst ri ding Or the rectifier
might soon get damaged.
Plug
Marelli CW260L
Fuel
High octa ne petrol. Petrol tank capacity ab o ut 14 .5 liters (3
and 1 /4 gl s. ). Tw ist grip contr olled carburettor, Dell'Orto
make type ME 18 BS w ith air filter a nd inlet s ilencer type
B 20 B.
10

Lubrication
By pressure through a delivery and return gear pump. The
oil is contained in a crankcase well of about 1.9 liter s
(7 / 16th gls.) capacity . Screen pa ttern oi l filter in the
crankcase, centrifugal filter on the crankshaft.
Cooling
By air . Cylinder and cyl inder head extens ively finned .
Clutch
Multipl ate clut ch in oil bath, control le d by handlebar le ver .
Gear box
Constant me sh gears. F our speeds foot operated.
Bott om gear
Second gear
Thi rd gear
T op gear
Transmission
3.04
1.81
1.29
Primar y drive by helical gears. Seco ndary drive by roller chain.
Gear ratios:
from engine to gear box
from gear box to chain wheel
Overall
gear rati os ( engine·rear wheel) :
Bottom gear
Second gear
Top gear
Third gear
2.8
2.94
(25 · 70)
( 16· 47)
25
14,9
10,6
8,2
11

Overa ll dimens i ons:
Wheelbase
Length
Width
Height (dr y ) .
F RAM E
Minimum grou nd cl ea rance
(light fr om l owe st pa rt of
fra me )
Dry we
igh t
Susp e Ion
1.2 S0
1.9 00
O. SS O
0.900
0.160
about
m.
(SO " )
m.
(76 " )
m. (22')
m.
(36 " )
m.
(6 % ")
92 kgs (202
Pr on : , I s copic fo rk with hyd ra ul ic dam pers .
Ibs.)
Rear: swin ging fork with coil springs in hy draulic shock
ab s orbe rs.
Wheels
Spoked wh ee l rims 17 x 2 'I• .
Ty"
Fro nt 2 '/2 x 17 rlbbe d, r ea r 2.75 x 17 R studd ed .
Brakes
E xpand ing t ype. T wo brakes: one on the front whee l operated
by lever on the right handlebar, the other on the rear wheel
operated by a pedal on the le ft hand side of the machine .
Electrical equipment
Generato r : flywheel alternator .
Rectifier for
battery charge in the headlam p.
12

Headlamp with key for engine start ing and operation of the
lighting system. This key is also used as a switch for city
and country lights.
5 inch es headlamp . Dipp er sw itch and electric horn button on
handlebar .
Rear
lamp for plate i llumin ation, parking, and stop light.
Electric horn .
6 V 7 ampere battery .
Speedometer
Inc orporat ed in the h ead l amp.
Performances
Gradients clim babl e: 31 % so lo on goo d s urf aced roads.
Fuel con s um p ti on : 2.7 lit ers per 1 00 km s. ( abo ut 104 m.p.g.),
measur ed acco rding to CUNA s tand a rd s.
Maximum speed s pe rmi ss ibl e in t he vario us gears :
bott om gear km s. 33 (20.5 mil es )
second ge ar }) 55 (34.1 miles )
thire! gear }) 77 (47 .8 miles)
top gear .
}) 110 (ab o ut 70 miles)
13

MAINTENANCE INSTRUCTIONS
Before st arting make su re th ere is sufficie nt petro l in tbe
crankcase well. Oi l le vel is checked by means of the di pst i ck
we ld ed on to the fi ll er cap. Correct o il level is in between
the minimum and maximum marks (fig. 5 ). This c heck shou ld
be made with the filler cap unscr ewed.
Under no circumstances should hills be descended with the
g ear in neutral or th e clutch disengaged. It is far better to
ut ilize th e braking effect of the engine w ith the throt tle control
at min imum ope n. in g. Steep hills s hould be descended in th e
l ower g ea r s, as this will save ove rhe a ting of the drum s and
wear of th linings. On w t or slippery roads proceed with the
ut most cere, avoidin 9 viole nt ac cele ration and/or fierce
br ak ln gs . In suc h co nditi ons, it Is well to conside r decreasing
slightly the tyre pressure.
Hills s hould be c limbed in the gear which allows the eng ine
to run at no rmal revolutions . Under no circumstances whatever
sho uld hills be climbed by slipping the clutch . This wo uld
rep i dly wear the plates out.
Particu l ar care shou ld be taken not to excee d the maximum
speeds in the diff r nt gears specif i ed in « Pe rform ances:>.
Fuel taps
The left tap is the reserve tap and s hould be kept closed
for use in an emergency only : H owever, it is 1) goed rule to
oc casionall y check its efficiency and to cl ec:n it out if ob s tr uc ted
by grit or other foreign matter .
Ignition key
Before the eng ine can be s tarted or the el ectrica l equipment
used, it is necessa ry for the ignition key to be pushed right
14

down in its « contact» position. To stop the engine, the key
should always be withdrawn from contact.
Starting the engine
To start the eng ine from cold: open right hand fuel tap,
check if gear le ver is in neutra l, push ignition key down in its
Fig. 5
15

co ntact positi on, turn twist gr ip li ght ly, push down ca rburettor
a ir slide (Fig . 11 A) , and depress th e kickstarte r sha rply. One
or two kick are genera lly s ufficient to start the eng ine.
When s tarti ng fr om co ld, and especia ll y in w int er tim e,
it is conven i ent to sl i ghtly fl oo d the carburettor, taking care
not to ove rd o this as it may th en make star ting rather dif-
ficult. This is unnecessary to start a hot - eng ine.
In the cold s eason, it is well to l et the engine idle a shor t
while to allow the oil to war m up befo re taking off. Be s ure
to res tore the air s li de to its o rigin al r idin g po si tion .
N.B. - This engine can also be star ted wi th an engaged gear by depressing
the kickst arter with the clutch withdrawn .
Racing the engine
Un de r no c ir cu mste nc s wh ateve r should th e eng i ne be
al l ow d to run at high revo lutions b efo re ta king off.
Starting the motor cycle
Afte r the engine is sta rt ed , w ithdraw fully the clutch l ever,
engage bo tt om gea r, and sl ow ly release th e c lutch accelerating
the engine at th sam ti me as th e c lut ch s tarts to « bite ».
U se of gear- box
(s fig. 6)
To change to a high er gear, the thr o tt le sho uld be s hut
a nd th e cl utch s imultane ously w ith drawn, moving the gear
lever in the ne xt p osi ti on. The clut ch shou ld then be rele ased
slowly and the thr o ttl e gradually re-op ened.
To
change down, the pr ocedure is reve r sed, exce pt th at the
thr o ttle sho uld not be co mpl etely cl ose d.
Change up rather than l et the engine race. Change d ow n
rather than let is slog.
16

Stopping the machine
To come to a standsti II, close the throttle and apply bo th
brakes evenly. Just before the machine stops, pull the c lutch
and select neutral.
In case of an emergency stop whi l st go ing in a straight line,
it is advisable to use both brakes sim ult aneously to avoid
wheel lock which might lead to the danger of a fall.
Stopping the engine
To stop the en gin e, di sco nn ec t the ignition key from its
« contact }) pos iti on and turn off the fuel tap.
Fig. 6
17

Inspection
After a wet rid e or one over particularly bad roads, the
machine should always be checked over externally and dried.
Storing the machine
If the machine is being pu t away for a fairly long period :
-
Thoroughl y clean the mach ine «see Periodical Main-
tenance ».
- Intr oduce a li t tl e o il into the cylind er through the
plug hole and r evo lve the eng ine a few times to even ly distribute
the oil over the cy li nder wa lls.
- Raise the machine so that the tyres are out of contact
with the grou nd, espec ia ll y if the fl oo r is slippery or greasy.
~ Cover with V s lin or ant i rust co mpound all metal
parts not name ll ed.
Carburation faults and cures
If the engine will not sta rt or s tops suddenly, the cause may
be one of th e following :
-
Lack of fu I. Ch ck if there is fuel in the tank, also
if the tap is open.
-- Ob$truc-tlon 0
blow throu gh 0 r fu I
pipes and/o r filters. Clean and
th ob true Ion .
- Carbu rettor I ts obstruet d. CI an with a ir jet.
Ignition faults and cures
If the engine will not start and the carburation is in order,
s uspect the fault in the ignition.
Check if there is a spark at the plug by holding its body
aga i nst the cylinder and revolving the eng ine with the
kicks tarter .
18