MOTO GUZZI 850 Le Mans III Instruction manual

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ptlr10rmanea 01 Iha ",olo. cycle or lor conltruetlve or eo",,,, .. cla l re aso n •.
SEIMM MO TO GUZZI + SERVI ZIO PUBBLICAZIONI TECNICHE
COD 14920156
lO00K· 11 79 - Prinled In lla l ~. Maflan,· A IInIII Bergamo

HINTS ON THE PROPER USE OF THIS MOTORCYCLE
Due to its exc 'eptionally high feature, this motor-
cycle can be considered as in the racing ma-
chine cla ss and as such has to be ridden in a
sportsmanlike way.
For this very reason, it has met the favour of ma-
ny motorcycle fa ns but, same as for all racing
bykes. it has to be used accordingly.
For instance, for fuel feed this model is filted
with carburettors with pumps and if the twist
grip is not used correctly in accordance wi th
the engine revolutions, there might be an excess
of fuel which is ejected by the c arburettors , si-
milarly as occurs on spo rting cars thai fil same
type carburettors.
It is obvious thai if in such conditions the engine
backfires, the risk of a fire is quit e considerable.
When travelling at low speed or in other words
at low revs, it is necessary
for the throttle grip
to be used with care since the immission of a
greater quantity
of fuel might not be fully absor-
bed by the engine.
At high speed. also in case
of abrupt accelera-
tions. the fuel is entirely absorbed and used up
by the engin
e, thus eliminating this risk and con-
ferring to this model the
brilliant " kicking up ..
qua l ities that make it one of its outstanding
features.
205

IN 0 EX
tti MAIN FEATURES
CONTROLS AND ACCESSORIES
INSTRUMENTS AND CONTROLS
27.1 Panel bo ard
27 .2 Ligh t switches
27 .3 Horn flashing light and t urn Signal con trols
27 .4 En gine s tarl ing and stopping butt ons
27.5 Fuel
filler ca p
27.6
Saddle lifting dev ice
CYUNDERS -PISTONS -PISTON RINGS
28 .1 Cyli nde rs
28.2 Pist ons
28 .3 Fitting the piston on con -rod
28 .4 Piston pin • piston ho le - clearances
CON-RODS -CRANKSHAFT
29.1 Connec ting rods
29 .2 Crankshaft
pag. 151
pag. 153
pag. 154
pag. 156
pog. 156

30.1 Carburettors
30 .2 Floats le velling
30 .3 Adjust ing i dling speed w ithout vaeuorneter
30 .4 Checking the carburation with a vaeuornet er
30.5 Carburettor compone nts
FRONT 8118_ ANa
WHEELS
ELECTRICAL EQUIPMENT
34.1 Battery
34 .2 Spark plug recommendation s
34 .3 Ignit i on timing "lJxed advance "
34 .4 Checking I gn ili on advance (fixed + aut o matic ) uS ing
a str o be light
34 .5 Igniti on data
HORN AND LIGHTING EQUIPMENT
35 .1 Replacing the lamp s
35.2 Lamp s
35 .3 Headl i ght beam adjustment
ELECTRICAL EQUIPMENT
36.1 With unp rinted panel ci rcuit
36 .2 With printed panel circuit
37.1 Table 01 th e gears and ma in shafts sel for strai ght
toothed gearbox
37 .2 Engine b ooslup kit
peg. 1110
peg. 184
pag. 184
psg. 184
psg. 165
psg. 166

ElMAIN FEATURES
ENGINE
- cyli nd er disposition
- bore
- stro ke
-
disp l acement
- co mpression ratio
-max torque
VALVE GEA R
CA RBURATION
LUBRICATION
GENERA TOR ALTERNATOR
IGNITION
- ignition data
- contact breaker points gap
-spark
plug type
- spark plug pOints gap
- i gnition coils
START I NG
TRANSMISSION
CLUTCH
PRIMARY DRIVE
GEARBOX
- ratios:
l ow gear
2nd gear
3rd gear
4th gear
high gear
4-stroke
«V .. type 90"
83 mm
78 mm
844 cc
10.2
7.8 kgm at 6600 rpm
OHV push rod operated
2 «DelJ 'Orto» carbu r etto rs PHF 36 8(0) ( right)
PHF 36 8(S) (left)
oil pressure by gear pump
wire gauze and cart ridge filters in the oi l sump
oil pressure 3.8-4.2 kg/cm2 (54-60 Ib s. sq.in),
contro lled by relief valve in the sump
oil pressure solenoid
l ocated at the front end of the crankshaft (14 V -20 A)
battery-coi l with twin contact breaker
initial adva n ce (fixed ) 8"
automatic advance 26 "
total advance 34"
0.37 -:- 0.43
mm (.014-.017")
Bosch W 230 T 30
Champion N 9 Y
Lodg e 2 HLNY
0.5 mm (.019")
2 fitted on the frame over the engine unit
electric starter (12 V -0.7 KW) with electromagnet ic
ratchet contro l
ring gear secured to flywheel
starter button (START) on the R/ H side of the handlebar
dry type -2 dr iven plates on the flywheel
lever controlled from the handlebar (left)
by gears , ratio 1 : 1.235 (Z = 17/21)
5 speeds frontal engagement , cons t ant mesh gears
cush drive in corporated
foot controlled on the L/ H side of the vehicle
1 to 2
1 to 1. 388
1 to 1.047
1 to 0.869
1 to 0.750
(14/28)
(18/25)
(2 1/ 22)
(23/20)
(28/21)
151

SECONDARY DRIVE
-ratio
-overall gear ratios:
low
gear
2nd gear
3rd gear
4th gear
high gear
FRAME
SUSPENSION
-front
-rear
WHEELS
-front
-rear
TIRES
-front
-rear
BRAKES
-front
-rear
OVERALL DIMENSIONS
AND WEIGHTS
-wheel base
-length
-width
-height
-ground clearance
-dry weight
PERFORMANCES
-max speed
-fuel consumption
FUEL AND OIL CAPACITIES
-fuel tank
-reserve oil sump
-gearbox
-rear drive box
(level gears)
-telescopic fork (each leg)
-front and rear braking
circ uits
152
cardan shaft and level gear set
1 10 4.714 (7/33)
1 to 11.643
1 to 8.080
1 to 6.095
1 to 5.059
1 to 4.366
cradle type - tubular structure
telescopic front fork "MO TO GUZZI patent»
swingi ng arm with externally adjustable springs
rims cast in light alloy, rim size
WM 3
/2. 15 X 18"
WM 3/ 2. 15 x 18 "
Pirelli 100/ 90 H 18 (MT 18)
Michelin 3.50 H 18 (M 45)
Metzeler 3.50 H 18 (Rille)
Pireili 110/90 H 18 (MT 18)
Michelin 4.00 H 18 (M 45)
Metzeler 4.10 V 18
(Block e7)
Tire brand fitted alternatively to comply with the different
standards in each country.
hydraulic disc -twin braking cylinde rs caliper -
hand controlled from the R/ H side handlebar
hydraulic circuit independent from rear brake:
disc di a. 300 mm (11 .8 /1 )
braking cylinde r dia. 38 mm (1.49")
master cylinder dia . 12.7 mm (.5")
hydraulic disc -twin cylinder caliper
foot controlled on the R/ H side of the vehic le:
disc dia. 242 mm (9 .5 /1)
braking cyli nd er dia. 38 mm (1.496")
m
aster cylinder dia. 15.875 mm (.6249/1)
the rear brake is hydraulically interconnected to a second
fr
ont brake leatured and dimensioned same as the R/ H
lev
er controlled brake
1.485 m (58.4")
2.190 m (86
")
0.610 m (24")
1.210 m (47
")
0.175 m (6 . 9" )
196 kg (
431 Ibs)
solo riding: 230 km/ h ( 144 mph)
6
.5 Its km (abt 32 mpg)
22.5 Its (5,84
us gls) Petrol Super (98/100 NO-RM)
3
li s (3
1
/. quarts) «Agip SINT 2000 SAE 10 W/ 50"
0.750 Its (1,3/ 4 pints) «Agip
F.1 Rotra MP SAE 90"
0.250 Its (abt 9 oz)
of which:
0.230 Its (S 1/ 4 oz) "Agip F.l Rotra MP SAE 90"
0.020
lis (3 /4 oz) «A gip Rocol ASO/ R» (Mol ikote type «A»)
0.090 Its
(3 oz) « Agip F.1 ATF Oexron ...
«Agip F.1 Brake Fluid -SAE J 1703 B»

CONTROLS AND ACCESSORIES
(fig. 206)
1 Front turn sig nal lights .
2 Control le ver , R/ H front brake.
3 Voltmeter.
4
Speedometer .
S Throttle con tr ol grip .
6 I gnition key .
7 Fuel
tank lock set.
B Left
front brake and rear brake pedal.
9 Fro nt foot-rest.
10 Master cylinder for left front and r ear brake.
11 Saddle lifting lever.
12 Rear
foot -rest.
13 Headlight.
1C Panel board .
1S Rev- counter .
l' Clut ch .Iever.
17 Clock .
18 Gear selector pedal.
1. Rear turn light.
210 Tai l li gh t.
Ri ght or feft in the text is BS seen by the ,i dar
ast ride the sa ddle .
L- __________________________________________________________ ~20.
153

207
208
154
III INSTRUMENTS AND CONTROLS
27.1 PANEL BOARD (f ig . 207)
1 Clock .
2 Aev·CQunler.
3 Speedometer.
4 Voltmeter.
S Ignition key:
"O FF . In line with mark « C» on the panel :
machine
at sta nd st ill. Key remov-
able.
"A .. In li ne with mark .. Coo on the panel
(turned
clockwise) : machine ready
to be started , All con tact s «on .. , Key
not removab le .
.. 8 .. In line with mark «C .. on the panel
( turned cl ockwise). With swi t ch .. A ..
(fig. 5) in posi tion .. 0 .. parki ng light
is "on ,. , Key removable.
6 Warni ng light (green), L/ H turn signal.
7 Warning l ight (orange or green) . gearbox in
neutral position when lit.
a Warning light (red) indicating in su fficient
c urr ent from generator . Should go out when
the engine has r eache d a ce rtain numbe r
of revs.
9 Warning l
ight (red). Oil pressure indicator .
Goes out when
pressure is sufficie nt for nor·
mal engine lu bri cation. If not, the pressure
is Incorrect and t he e ngin e ha s to be stop·
ped imme diately and oil level t op ped up .
The l
ubr ication system should also be che·
cked over .
10 Warning light (red) i ndicat ing low level of oil
in the reservoi r·ma ster cylind er for the fr o nt
le ft and rear brakes. When this light co mes
on, top up the re
servoir ens ur ing there are
no leakages in the hydrau li c c ir cui t.
11 Warning light (blue) indicating high beam
on.
12 Warning light (gree n) indicat i ng parking
lights on.
13 Wa rning light (green) right tu rn signal.
14 Switch for emergency flashers.
15 Zero re set for speedometer.
27.2 LIGHT SWITCHES (fig. 208)
Are fitted on t he Lj H side h andlebar .
Switch fC A»;
•
.. E» parking l ight ;
• .. 1" dua l filament bulb lighting;
• .. 2 .. lights off.