MOTO GUZZI 850 Le Mans III User manual

1:1 5 c::J ( Le M~ns)
OWNER'S MANUAL

Cod. 14900051 - 4·77 - 1000 K - PrInbId In bey -Ma-iMI-AIme I8GI

Dear rider,
First at aI/ we wish to thank you tor choosing this motorcycle 01 our
production.
By lollowlng the instructions outlined In this manual you will ensure
your bike a long and troubletree life.
Before riding, please read thoroughly this manual
In order to know your
motorcycle's features and how to operate it safely.
All major checking and overhaul jobs are best carried out by our dea-
lers
who have the necessary facilities to quickly and competently repair
your Mota
Guzzi.
Repals or adjustments by any other than a Guzzi dealer during the war-
ranty period could invalidate the warranty right.

INDEX
4 Main features
10
Controls and accessorIes
12
Identification data
13
Instruments and controls
1.
Riding Instr.ctlons
21
Running In
22 Maintenance
29 Removal of wheels
32 Lubrication and
maintenance chart
34 LubricatIons
38 Carburetlon
41
Valve gearing
42 Ignition
46 Electrical equipment
4.
Wiring Diagram

4 MAIN FEATURES
Engine
Valve gear
CarbureUon
Lubrl~Uon
Generator
Ignition
2-cylinder
~stroke
Cylinder disposition
Bore
Stroke
Displacement
Compression ratio
Output
-v. 90"
mm 83
mm 78
cc 844
10,2
HP 80 SAE at 7.300 r.p. m.
O.H.V. push rod operated.
2 Dell'Orto carburetlors type
PHF 36 B (D) (right),
PHF 36 B (S) (left).
Pressure, by gear pump.
Normal lubrication pressure 3,8 or 4,2 Kp/cm
2
(controlled by relief-valve).
Electrically controlled oil pressure gauge.
Wire gauze and cartridge oil filters.
Front
(14 V- 20 A) on the crankshaft.
By battery, with double contact breaker and auto-
matic advance.

Transmission
Clutch
Primary drive
a.ar boll
Ignition data:
Initial advance (fixed) 8"
Automatic advance 26"
Full advance 34·
2 Ignition coils, on the left side of frame
Electric starter with electromagnetic ratchet con-
trol. Ring gear bolted _
on flywheel.
Starter button, (STARn right on the handlebar.
Dry type, multlpilltes, flywheel driven. Lever con-
trolled from handlebar (left).
via the gearbox.
Ratio: 1 :
1,235 (Z =17/21).
Five speeds, frontal engagement, constant mesh
gears. Cush drive Incorporated.
Pedal controlled from lett side of the motorcycle
Ratio:
low gear 1 : 2
(Z =14/28)
2nd gear 1 : 1,388 (Z =18/25)
3rd gear 1 :
1,047 (Z =21/22)
4th. gear 1 : 0, 869 (Z =23/20)
top gear 1 :
0,750 (Z =28/21)
5

6 S.cond.ry
drlv.
Cycle
Fram.
Su..,....lon
WhHI.
TI ....
cardan shaft (bevel gear set).
Ratio: 1 : 4, 71. (Z =7/33).
Overall gear ratio (engine/wheel):
low gear 1 : 11 . 643
2nd gear 1 8,080
3rd. gear 1 6,095
4th gear 1 5,059
top gear 1 . , 366
Duplex cradle, tubul ar structure.
Telescopic front fork incorporating sealed hy-
draulic dampers.
Rear swinging fork with externally adjustable
springs.
In light alloy, with ri ma , WM 3/2,15-8 front and
rear.
Front
3,50 H - 18" or 100/90 H - 18"
Rear . ,00 H - 18" or 110/90 H - 18"
or 4,10 V - 18"

B,ak ..
DlmensloM and weights
Front:
Hydraulic disc brake, twin braking cylinder cali-
per. Hand lever controlled trom the handlebar
(R/H). Hydraulic transmission, free from rear
braking system.
Disc
Braking cylinder
Master cylinder
Re.r:
121 300 mm
121 38 mm
121 12,7 mm
Hydraulic disc brake, twin braking cylinder ca-
liper. Pedal lever controlled trom the motorcycle
(A/H).
Disc 121 242 mm
Braking cylinder 121 38 mm
Master cylinder 121 15,875 mm
Hydraulic t,anslmlulon:
The rear brake Is bound by a hydraulic transmis-
sion to a twin front brake featured and dimen-
sioned like the hand controlled front brake.
Wheelbase
Max. width
Max : length
m 1.470
m 2,190
m 0.720
7

8
Performances
Max. height m 1, 030
Min..ground clearance m 0, 150
Dry Weight kg 198
Maximum speed,
solo riding:
210 km/h.
Fuel consumption: It 8x 100 km.

Fuel and oil capacities 9
Group or part
QUllntItIft
" Rec:ommencIatlon
Fuel lank (Reserve 3 II): 22.5 Petrol 98/100 NO-RM
Sump: 3 Aglp SINT 2000 SAE 10 WIse
Gearbox: 0.750 Aglp F. 1 Rolra
MP SAE 90
Rear drive box: \ 0.230 Agip F. 1 Rotra MP SAE 90
(bevel set lubrication) ! 0.020 Molyklole type A
Front fork (p. leg): 0.120 Aglp
F. 1 ATF Dexron
Front and rear brakes: Agip
F. 1 Brake fluid

10 CONTROLS AND ACCESSORIES
(fig. 2)
1 Master cylinder (front right brake)
2 Control lever (front right brake)
3 Throttle control grip
.. Engine starting and emergency stopping
button
5 Key switch
6 Fuel tank filler cap
7 Brake control pedal (front left and rear brake)
8 Foot-rest, front
9 Foot-rest, rear
10 Headlight
11 Instrument panel
12 Km or mile counter
13 Rev. counter
14 Clutch control lever
15 Buttons controlling: horn, flashing light and
turn signals
18 lighting switch
17 Gear change control lever
11 Tall light
19 Master cylinder (left front and rear brake)
Right and left hand as seen In riding position.

11
1 2 3 4 5
678
9
10 11 13 12 14
15 16
17 19
18
2

12 IDENTIFICATION DATA
Every motorcycle Is identified by a serial number
which
is stamped on the frame downtube and
on the crankcase.
The number on the frame downtube appears
also in the certificate of conformity and Is va-
lid to legal effects for the Identification of the
motorcycle.
* 10001 *
* ..j JZJ
Spare parts
In case of parts replacement, make It sure that
.. Original Molo Guzzi Spa,. Parts. only are used.
Tha u.. of non-genulne parll InvaUdatn tha
w.rranty right.
WARRANTY
Tha warranty Is 'laUd tor B period 01 8 month,
with a 11m Italion to 10000 km from the ,.lIIng
data and e.pl,... In c... of modification, to
the motorcycle or participation to racing com-
petition,.
Ty,n ., well ., parts or Bccn,orln which .,.
not manulactured In the .Salmm -Moto Guzzi
Faclo,la,. ara out of warranty.
Each new motorcycle is supplied with a -cou-
pon-book-. It has to be carefully kept with all
othe, ci,culatlon papers as this is the only docu-
ment entitling the owner of the motorcycle to be
recognized of the warranty ,Ight from .Selmm
Moto Guzzi- according the general sale con-
ditions.

INSTRUMENTS AND CONTROLS
Instrument panel (fig. 4)
1 Km counter.
2 Rev.-counter.
3 Orange neutral Indicator. It lights when the
gearbox is
In neutral position.
4 Green light Indicating parking light on.
5
Red warning light. 011 pressure gauge. It g08s
out when the pressure Is sufficient for normal
engine lubrication. Should It not go out, the
pressure
Is not correct; In this case the engine
has to be stopped and suitable checklngs are to
be carried out.
IS High beam warning light, blue.
7 Red warning light Indicating insuHiclent cur-
rent from the generator for battery charge. It
must go out when the engine reaches a certain
number of revolutions.
By day riding all warning lights are to be out.
By night riding the parking warning light only
and eventually the high beam warning light
are on.
.. Red warning light Indicating uncorrect brake
fluid level
In the reservoir for front left and
rear brake. When this light Is lit, It Is necessary
to top at maximum level
In the reservoir and to
check .that there are no fluid leakages in the
4 braking circuit
13

14 Steering damper control (fig. 5)
-Knob Position A: damper rests.
-Knob Position B: damper works.
._- .. .. __ .-
Key Switch (fig. 5)
The key has three positions.
.0. (vertical) Standstill, key removable.
-1· (turned counterclockwise) Standstill, key not
removable. Parking light is on with button
.A. (LIGHTS) in line with .Park •.
'. . II -2· (turned clockwi se) Ready to start, all con-
trols are In. Key not removable.

Lighting switch (LIGHTS) (flg.6 .A-)
Left, on the handlebar, 4 positions.
.1- OFF Lights off.
·2- PARK Parking light.
.3- L Low beam.
• 4. H High beam.
.. 5- Stop button. To come back to po-
sition OFF press II towards the left.
Horn. flashing light
and tu
rn signal controls (fig. 8 .. 8-)
Left, on the handlebar.
• 6- HORN Hom button.
• 7- FLASH Flashing light button.
• 8. OFF
Tum lignall button.
Engine starting and
emergency stopping (fig. 7
.. F)
Right, on the handle~r.
With the Ignition key In pOlitlon .2- (fig. 5) the 15
motorcycle is ready to be started. To start the
engine press the button
.. 1- START.
To Itop the engine (In case of emergency) turn
the lever to position
-3- or .4. OFF.
After engine stopping, reset key in position .0-
fig. 5.
Starter control (flg. 27)
The control lever for starting a cold engine Is
ftxed to one of screwl securing rocker box cover
to left cylinder head.
.A- Starting politlon .
.8- Riding position.
Steering damper
It is Icrewed to ItI control plate and welded to
the trame.

16 Throttle control
Right on the handlebar; throttle Is opened by
turning toward the rider and closed vlceversa.
Clutch control lever
Left on the handlebar, to be used lor starting
and gearshifting only.
7
•
Front brake control lever (right)
Right on the handlebar, connected to Its master
cylinder.
Brake control pedal (F in IIg. 17)
On the rigth side of the motorcycle.
It controls both rear and Iront left brake, link
connected to Its master cylinder.
~. ~ ~ .. , ~ -" ~ :. ~ .~:. ,~"
,.

Gearshift control pedal (flg. S)
On the left side of the motorcycle.
Low gear: pedal down.
2. 3. 4. and top gear: pedal up.
Neutral position: between 'Iow and 2nd gear.
Before operating the gearshift pedal. the clutch
lever has to be fully
pulled in.
Fuel filler cap (fig. 9)
To open it. press the control button -A- . •
10
Fuel taps (fig. 10)
They are located under the fuel tank. rear side.
Positions:
-A.. Open (vertical).
-R. Reserve (horizontal) see -R .. on the taps.
-C- Closed (horizontal) see .C· on the taps.
Terminal block with fuses (flg. 11)
It Is located on the right side of the bike and
holds n. 6 16 A fuses. Access Is made possible by
taking off the right motorcycle cover.
17

20 On the way
To change to another gear, close the throttle,
pull the clutch lever fully in and shift Into the
new gear; release gently the cluch lever and
open the throttle at the same time. The gearshift
pedal has to be firmly actuated and foot ac-
companied.
When shifting down to a lower gear, gradually
operate brakes and throttle control not to cause
the engine to go o"er reva, when releasing the
cluch lever.
Stopping the motorcycle
Close the thottle contrOl, operate the brake con-
trol levers, the clutch lever will be pulled in when
the motorcycle comes almost to stopping.
This manoeuvre has to be very co-ordlnalely car-
ried out not to let the motorcycle gOing beyond
control.
To normally reduce speed, use the engine brak-
ing power by correctly gearshifting and paying
attention that the engine does not go o"er reva.
On wet or slippery roads, the brakes, especially
the front one, (right) have to be carefully opera-
ted. To stop the engine turn the ignition key to
position
.. 0- (see fig. 5).
When the engine Is stopped, r.member to close
the tIIps by turning them to poslllon .C.. In
fig. 10.
Parking
By parking on insufficiently lighted roads, It is
necessary to iet the parking lights on,
by turning
the ignition key to position
.1- in fig. 5 and the
light swich A (LIGHTS) to position
.. 2. (PARK)
(see fig. 6) . Take off the k~y .
To lock the steering see fig. 12 and proper in-
structions.