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850 - T
OWNER'S
MANUAL
Pt # 1790 0000
Dear rider,
First of
all
we
wish to thank you for choosing this motorcycle of our
preduction.
By
following the instructions outlined
in
this manual you will ensure
your bike
s long
and
troublefree life.
Before riding, please read thoroughly this
manual in order
to
know your
motorcycle's feafures and
how
to
operate it safely.
All
major checking
and
overhaul jobs are best carried out by our dea-
lers who have the necessary
fa
cilities
to
quic
/e
ly
and competently repair
your Mota Guzzi.
Repairs
or
adjustments
by
other than a G
uz
zi dealer during the warranty
period
could
invalidate
th
e
wa
rranty right.
INDEX
4 Main features
10 Controls and accessor
ie
s
12
Identification deta
13
Instruments and controls
19
Riding instructions
22
Maintenance
28
Removal or wheels
31
Lubrication and maintenance chart
36
Lubrications
39
Carburation
42
Valve
gear
ing
43
Ignition - Checking and
ad
justment of double contact breaker
45
Checking of ignition timing
..
fixed
ad
'/ance
..
47
El
ectr
ic
al
eq
uipment
4
MAIN
FEATURES
Engine
Valve g
ea
r
C
arbu
ra
li
on
2-cylinder 4·stroke
C
ylinder
ci
isposition
Bore
Stroke
Disp
la
cemen
t
Compression
ratio
Revs. at max. engine
speed
Maximum
horsepower
O.H.V. push rod operated.
T
iming
data:
inlet: opens
20"'
before TOe
closes 52' aHer BOC
exhaust:
opens
52*
before
SOC
clos
es
20- after TOe
.v
..
9
0"
mm
83
mm 78
cc 844
9,5
7000 r.p.
m.
H?
65
Recker clearance
for
valve timing mm 1.
:.
Nor
mal
rocker
clearance, ce
ld
engine, mm 0,22.
2
Oell'Orto
carbu
re
tors
type VHB 30 CD (right).
VHB
30 CS (left).
Lubr
icati
on
Ge
nerat
or
Ignillon
Ignition data
Starting
Pressure, by
gear
pump.
Normal lubrication pressure 3,
8";-
4,2
kg
/sqcm
(controlled by
re
li
ef-valve).
El
ectr
ica
lly
controlled o
il
pressure gauge.
Front
(14
V - 13
A)
on the mainshaft.
By
ba
ttery, with double
contact
breaker and auto-
matic advance.
In
iti
el advance
Automatic advance
Fu
ll
advance
Contact
break
S'
r gap mm 0,42 +
0,48
Spark plugs:
long
th
read
(0
14
x 1,25)
Thermal
degree
240
Plug points gap mm 0,6
2 ignition coil
s.
S'
26'
Electric starter with el
ectromagnet
ic
ra
tchet
con
·
trol.
Ring gear bolted on flywheel. Starter button.
ri
ght
on the handlebar.
5
6
Trasmission
CIU
ICh
Gear
box
Frame
Suspen
sio
n
Wheels
Dry type, twin plates. flywheel driven. Contro
ll
ed
by lever, on the handlebar (left).
Fi
ve
speeds, frontal engagement. constant mesh
gears. Cush dr
iv
e incorporated.
Controlled
by
pedal on the left side of the mo-
torcycle.
Bevel gear ,a/io: 1 : 4,625
(Z
= 8-37
).
Overall
gear
ratios:
low
gear
= 1 :
11
.
424
second
gear
=
1:
7,928
third
gear
=
1:
5,
9EO
fourth
gear
=
1:
4,963
top gear
:::::
1:
4,284
Duplex cradl
e,
tubular structure.
Telescopic front fork
incorpora
t
i
n~
hydrau
li
c
dampers.
Rear swinging
fork with externa
ll
y
ac
j
ustab
le
springs.
Spoked rims,
WM
3/ 2.15 x 18 front and l
sa
r.
Tires
Brakes
Dimensions
and weights
Front 3,
50
H -
18
S
41
studded.
Rear
4.10 H -
18
S
~1
studded.
Pressure:
front
$010
with
passenger
r
ear
solo
with passenger
1.8
kg
/sqcm
2.2
kg
/sqcm
2
.5
kg
/sqcm
The
abovg data
Bre
for normal
rid
ing (cruising
speed). If us;ng Ihe motorcycle at cons rant h;
gh
speed
or
on
mo/orNays,
It
is recommended
to
increase
pr~ssure
by
0,2
kg/sqcm.
Fro
nl:
hydraulic
di
sc
brake. Disc ~
mm
300.
Controlled
by
lever, right on the handlebar.
Rear: expansion type
(0
220 x
25)
. Controll
ee
by
pedal on
th
e right side of the motorcycle.
Wheelbase
m
1,470
Max. wi
dth
m 0,780
Max. tength m 2
.200
Max. height m
1,OSO
Min. ground clearance m 0,150
Engine
we
ight (dry) with carburetors and elec-
7
8
Performances
Electrical equipment
Passing ability
tr
ical equipme
nt
, without inlet silencers. exhaust
pi
pes
and
s
il
encers
kg
60
,5
00
Cu
rb
wei
gh
t
kg
235
a.
Maximum speed in each gear. 5010 riding:
Gears Spe
ed
1
01'1
gear
km
/ h 76 (
47
m.p.h
.)
second gear
km
/ h 110 ( 63 m.
p.
h.)
thi
rd
gear
km
/ h 146 ( 90 m.p.
h.)
fourth gear
km
/ h
176
(109
m.p.
h.
)
top gear
km
/ h
195
a. (12 m.p.h
.)
Fuel consumption:
I.
7.27 x 100
km
(CUNA
).
Battery
Headlight of
sea
l
ed
beam type
Rear
light (lamp)
parki
ng
and
slop
Turn signal lamps
Spesdo
and
rev
. counter lam
ps
Neutral, generator, o
il
and lights tamps
Horn
12
V -
32Ah
12V-S
/
'<OW
12V
- 21 W
12
'1
- 3 W
12
'1
- 1.2 W
12V
Passi
ng
of a 55 fes! long t
ru
ck travelling at
20
m.p.h.
- Time:
- Distance
trave
ll
ed:
6,5
seconds
334 fe2t
Braking
ability
Passing of a 55 fee! long
truck
travelling
at 9
50 m.p.h.
- Time:
-
Oistanc~
travelled:
8,7 seconds
900
feet
The above includes a safe
ty
distance of
40
and
1
00
feet respectively between the passing and
pace vehicle at the beginning and end of the
manoeuvre.
Slopping distance from
60
m.p.h.
(so
l
o,
using
both brak
es
):
17i
feel.
Stoppi
ng
distance with passenger from
SO
m.p.h.
(us
ing both brakes): 193 1eet.
Fuel and oil capacities
Group
or
part
Fuel tank
Reserve
Sump
Gear box
Rear
dr
ive box
(bevel set lubrication)
Fr
ont
f
ork
(each leg)
Front brake
Quantity Recommendation
I.
25
I.
4
I.
3.5
I.
0,750
I.
0.340
I.
0.02
I.
0.050
Pe
trol
98
/
100
NO
-AM
Ag
ip F
.1
Supermotoroil
SA: 20 W / 50 .
Ag
ip F
.1
Rotta MP SAE S
Ag
ip F
.l
Rotra MP
SA:
90
Molykote type A
Ag
ip
F.
1 ATF Dexron
Agip
F.1
Brake fluid
10
CONTROLS AND ACCESSORIES
(fig. 2)
1 Front brake disc.
2 Front brake pliers.
3
Pump and fluid reservoir,
front
brake.
4 Front
brake
contro
l lever.
S
Throttle
contro
l grip.
6 Starter and engine
emergency
stop.
7 Key
switch
.
8 Fuel filler cap.
9 Rear brake pedal.
10 Footrest
11
Footrest passenger.
12
Head
ligh
t.
13 Fro
nt
turn
si
gna
ls.
14
Indicator panel.
15
Mile counter.
16 Rev·counter.
17
Clutch control lever.
18
Horn. flashi
ng
light and turn sig
r.
als bueons.
19
Lighting switch.
20
Gearshift pedal.
21
Rear turn signals.
22
Rear
light.
Right and lelt ars Imsnded
as
if
se~n
in tiding
position.
11
12
13
14
15
18 19
21
22
2
12
IDENTIFICATION DATA
(fig. 3)
E'lery
motorcyc
le is identified by a
se
rial numoei
which Is stamped on the frame down tube and
on the crankcase.
T
he
nu
mber
on
the frame
downtube
appears
also
in the certificate
of
conformity and is
....
a
~
lid
to
legal effects for the identification of the
motorcycle.
INSTRUMENTS AND CONTROLS
Instrument pan
el
(fig. 4)
M
ile
counter.
2
RS
'I.
-counter.
3 Red
warning
light
i
nd
ica
iing
insufficient
cu
r-
fant
from
the
generator
for battery c
haige.
It
m
ust
go
o
ut
wh
en t
he
eng
in
e reaches e
cer
tain
number
of
revo
lutions.
4 Orange neutral Indicator. It lights when t
he
gearbox
is in neutral position. It may be we
ll
to
ma
ke
sure
that
th
is positi
on
is correc!.
In
an
y
c:~
se
It is a good practice to
pu
ll the clutch
be
-
fore starting.
5
Re
d wa
rn
in
g light.
Oil
press
ure
gaug
e. It g
oes
13
14
out when the pressure is sufficient for normal
engine
lubr
ication. Should it
not
go
out, the
pre~·
sure is not
correc
t; in this case the angine has
to be stopped and
su
itable
chec
kings are to be
carried
o
ut
Ig
nition key and
steering
loc
k
The key has
fQur
positions (fig. 5):
6 High beam warning light (red).
By
da
y riding
all
warning
lighls
ar
e to be out.
·0
·
Standstill. key not
re
movable.
· 1.
(i
ntermediate)
Turned anticlockwise, standstill, key removable. Steering
locked on removal of
key and turning of
th
e handlebar right or
refl
Turned clockwise, be!ween position
-0
..
and position -2
.,
key removable. In
this position the key can
be
remov
ed
without locki
ng
the steering.
Turned c
lock
wi
se
. raaey
to
start, all controls are in.
Lights swi
tch
Left, on the handlebar,
-4
positions (fig. 6
..
a
..
).
..
,
..
OFF Lights oH.
..
2
..
PARK Rear light.
•
3.
L Low
beam.
..
4
..
H High
beam.
• 5. Safety
(to
come back to
posit
ion
OFF
press the button towards
1he
lelt).
~
'I
.
f~
.::
-
....
-:
..
-
.--:-:
-~
.
-
.
...-.
--':"
.
_l~;
Horn, flashing light
and turn signals
left,
on
th
o handlebar (fig. 6 -C
o)
.
• 6
..
HO
RN
Horn button .
..
7
..
F
LASH
Fl
ash
i
ng
light button .
..
8
..
Turn signals button .
..
9
..
When turned to the right operates t
he
right
sig
na
ls .
-
10.
When turned to the l
eft
operates: the le
ft
signalS.
....
'"';.'
".
-:-
-.-
15
16
Starting and engine
emergency stop
Righ
t.
on
the
handle
bar
(fig. 7
.A·
).
With the i
gn
ition key in
pos
ition . 2
..
the motor·
cycle is ready to be started.
To
start the engi
ne
(see
-A.)
press the
button
..
1
..
START.
To s
top
the
~
ng
i
ne
(in case of emergency) turn
the
butten
in pos
itio
n
..
3
..
or
.4.
OFF.
Carburetor starter control
T
he
two levers
for
starting a
cold
engi
na
are
located left on t
he
left ca
rburetor
and right on
the right c
arbu
retor
(fig. 23) .
..
A
..
S
tarting
~os
jti
on
.
• 8
..
R
idi
ng pos
ition
Throttle control
Right on the ha
ndleb
ar;
thr
o
tt
le is opened by
turni
ng
toward the
rider
and closed viceversa.
Clutch control lever
.Left on the
ha
ndlebar, to be used for starti
ng
and gearshifting only.
Front brake control lever
Right on the handlebar. connected with the brake
pump fluid reservoir.
Rear brake pedal
On the right side of the motor
cyc
le.
Gearshift pedal
On
the left sice of
~he
motorcycle (fig. 8).
l
ow
gear: pedal down.
2. 3,
4.
and
top
geer
:
peda
l up.
Neutral position: between low and 2nd gear.
B
elo
re
op~
rat
i
ng
the gears
hift
pedal, the clutch
lever has to be camp/staiy pu
ll
ed in.
,.
•
-,'
10
Fuel filler cap
To open it. press the control button
.A.
(fig. 9).
Fuel taps
They
are
loca
ted
fear
, under the fuel tank
(I
ig. 10
).
Pos
itions:
-A.. Open (vertica
l)
.
-R
oo
Reserve (horizontal) see cR_ on the tap
s.
.C.
Closed (horizontal) see •
C·
on
the taps .
17
18
Terminal b
lock
with fuses
It
is
located under the seat (fig.
11
) and
ho
l
ds
n. 6
15
A
fuses
.
11
RIDING INSTRUCTIONS
Chec
:<ing
Befo
re
start
i
ng
the engine ensure t
hat:
• there is sufficient fuel in the tank;
• the o
il
in
th
e
eng
in
e sump is at
correct
le
vel;
• the ig
nit
ion
ke
y is in
po
sition -2- (s
ee
fig. 5
);
• the
wa
rning
li
gh
ts: r
ed
(o
il
pressure
9au9';
and
generator
);
or
ange {
neutra
l i
nd
i
cator
} are
lit;
• the sta
rt
er
levers 0
:1
the car
bure
t
ors
,
for
col
d
eng
in
e
are
in starting position (v
ertical
) see
-A
..
in fig.
23
.
Engine starting.
Aft
er
t
he
f
ir
st checking.
tt!r
Q.
the
tw
ist
gr
ip
1
/
~
towards
the
ri
der
and push the start
butto(l
. ri
gh
t
on the ha
nd
l
eb
ar -1- S
TA
RT in fig. 7.
After the
eng
i
ne
has been starIsd. bef
ore
ret
urn
-
i
ng
the staner con!rol levers into riding position
(horizontal) see
.8
..
in fig.
23.
let
the engine
id
le
a
short
while in the hot season and a few minu-
tes in the
co
ld season.
S:,ould the cont
ro
l starter levers be left In start-
ing
pos
iti
on . An In fig. 2
3)
by
rid
ing, there would
be Irregu
lar
carburction and Increas
ed
luel con-
sumption and ev
en
worse. there could be the pos-
s
ibili
ty
01
seizures because of too much pe
lrol
going in
lo
the cylinders.
Do
nOi
forget
t
h
~
t
if
the engine is in gear. the
neutral i
nd
i
cator
lig
ht
(orange) is
not
lit:
to
start
th
e
~
n
g
i
n s
in
sue
.; co
nd
itions could
be
very dan-
gerous, unless
the
clutch
Is
kept lu
lly
disenga-
ged, as the
motorcycle
itsell
may
stan
off
.
Starting a hot engine
In this C2se it is not necessary to set the
sta
i!
er
control levers on the carburetors in startin
s;
pc-
s
ition
(
..
A
..
in fig.
23
) as this wo
uld
richen t
he
carburati
oio
tco much.
19
/
