MOTO GUZZI 850 Le Mans III User manual

This Manual supplied and scanned by Christian D Smith
Formatted and edited by Theo Bekkers

The illustrations and descriptions in this booklet are indicative only and the manufacturer
reserves itself the right to Introduce any modification It may deem necessary for better
performance or for constructive or commercial reasons without prior notice.
SEIMM MOTO GUZZI S.p.A. - Technical Publications - Code 2890 OD 51 Printed in Italy -
'Tecnopress/Bergamc - 1500 - 7-81

Dear rider
First of all we wish to thank you for choosing this motorcycle of our production.
By following the instructions outlined in this manual you will ensure your bike a long and trouble
free 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 dealers who have the necessary
facilities to quickly and competently repair your Moto Guzzi.
Repairs or adjustments by any other than a Guzzi dealer during the warranty period could
invalidate the warranty right.

HINTS ON THE PROPER USE OF THIS MOTORCYCLE
Due to its exceptionally high feature,
this motorcycle can be considered
as in the racing machine class and
as such has to be ridden in a
sportsmanlike way. For this very
reason, it has met the favour of
many motorcycle fans but, same as
for all racing bikes, it has to be used
accordingly.
For instance, for fuel feed this model
is fitted with carburetors with pumps
and if the twist grip is not used
correctly in accordance with the
engine revolutions, there might be
an excess of fuel which is ejected by
the carburetors, ending in the
air filter box of the carburetors
same. 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 absorbed by the engine.
At high speed, also in case of
abrupt accelerations, the fuel is
entirely absorbed and used up by
the engine, thus eliminating this risk
and conferring to this model the
brilliant" kicking up» qualities that
make it one of its outstanding
feat ures.

Page four is a Blank Page
INDEX
6 Main features
11 Identification data
12 Controls and accessories
14 Instruments and controls
21 Riding Instructions
23 Running in
24 Maintenance and adjustments
31 Removal of wheels
34 Service schedule
36 Lubrications
40 Carburation
43 Valve gearing

44 Ignition
47 Electrical
equipment
MAIN FEATURES
6
Engine
Twin cylinder - 4-stroke
Cylinder disposition
Bore
Stroke
Displacement
Compression ratio
Max torque
«V»
90°
83 mm
78 mm
844.05 cc
9.8
7.6 kgm at 6200
rpm
Valve gearing
Carburation
Lubrication
Generator/Alternator
O.H.V., push rod
operated
N. 2 carburetors –Dell-Orto ; type
PHF 36 B (D) (right), PHF 36 B(S)
.(Ieft).
Pressure, by gear pump.
Wire gauze and cartridge filters in
oil sump. Normal lubrication
pressure 3.8-4.2 kg/sqcm (54-60
p.s.i.).
Pressure relief valve control in
the sump. Oil pressure sender
unit in crankcase.
Front, on crankshaft (14 V - 20 A).

Ignition
Coil-battery ignition with double contact
breaker ' and automatic advance.
Ignition data: '
- ignition advance (fixed :8°
- automatic advance 26°
- full advance (f. + a.) '34'
Contact breaker points gap: 0.37 -0.43
mm (0.014"-0.016")
Spark plugs: Bosch
W 5 D
Lodge 2
HLNY
Plug points gap: 0.6 mm (.020").
2 ignition coils fitted-on the frame.
Starting
Transmission
Twin driven plates, dry type. Hand
controlled by lever on left handlebar.
Primary drive
By gears. Ratio: 1.235 to 1 (Z 17/21)
Electric starter (12 V - 0.7 KW) with
electromagnetic ratchet control. Ring
gear bolted on the fly wheel. Starter
button (start) on R/H of handlebar.
Clutch

.,
5 speeds, frontal engagement, constant mesh
gears. Cush drive incorporated.
Pedal operated on the L/H side of the
motorcycle. Gear ratios:
Low gear = 1 to 2 (Z = 14/28)
2nd gear = 1 to 1.388 (Z = 18/25)
3rd gear = 110 1.047 (Z = 21/22)
4th gear = 1 to 0.869 (Z = 23/20)
High gear = 1 to 0.750 (Z = 28/21)
Secondary drive
By cardan shaft, bevel gear set.
Ratio: 4.714 to 1 (Z = 7/33)
Overall gear ratios (Engine-wheel):
Low gear = 1 to 11.643
2nd gear = 1 to 8.080
3rd gear = 1 to 6.095
4th gear = 1 to 5.059
High sear = 1 to 4.366
Duplex cradle, tubular structure.
Front: telescopic fork «MOTO GUZZI make»
(patented) with oil pneumatic shock
absorbers. Rear: swinging fork and rear
dampers with adjustable external springs
concentric to the oil pneumatic shock
absorbers.
Frame
Suspension
Wheels
Front and rear in light alloy casting
with WM 3/2.15 -18" CP2 rims.

9
Front:
100/90V18
Rear:
110/90V18
Tires
Front: disc type with caliper having 4
cylinder controlled by hand lever on
right hand side of the motorcycle.
Hydraulic transmission independent
from the rear brake.
Disc size: 300 mm (11.8"), braking
cylinder 38 mm (1.49"), master cylinder
12.7 mm (.5"). Rear: disc type with fixed
caliper with two cylinders. Pedal
controlled from the R/H side of the bike.
Disc size 242 mm (9.5"), braking cylinder
size 38 mm (1.496"), master cylinder
15.875 mm (.624").
The rear brake is connected by an
hydraulic transmission to a second
brake on the front wheel having the
same features and size as the hand
controlled front brake.
Brakes
Wheelbase (loaded) 1.505 m (59")
Length 2.190 m (86")
Width 0.640 m (25")
Height 1.160 m (46")
Ground clearance 0.175 m (6.9")
Dry weight abt. 206 kg (454 ibs).
Dimensions and
weights

10 Performances
Top speed, solo riding 230 km/h (114 mph).
Fuel consumption: 5.7 I x-100 km
Fuel and oil capacities
Group or part
Quantity
Recommendation
Fuel tank
251 (6.15 US gls)
Supergrade petrol (98/100 NO-RM)
Reserve
3 I (3'/' quarts)
Oil sump
3 I (3'/. quarts)
Agip Sin! 2000 SAE lOW/50 oil
Gear box
0.750 I (10/. pints)
Aglp F.1 Rotra MP SAE 90 oil
Rear drive box
0.250 I (abt, 9 oz)
(bevel set lubrication)
of which
0.230 I (abt. 8 V. oz)
Agip F.1 Rotra MP SAE 90 oil
0.020 I ('I. oz]
Agip Rocol ASO/R oil
Front fork (each leg)
0.060 I (abt. 2 oz)
Agip F.l ATF Dexron fluid
Braking circuits (front and rear)
Agip F.l Brake fluid SAE J1703

IDENTIFICATION DATA
(fig. 2)
Each motorcycle is identified by
an identification number on the
frame downtube and on the engine
crankcase.
The identification number on the
frame is mentioned in the
motorcycle log-book and identifies
the vehicle to all legal effects.
-
Spare parts
11
In case of part replacements, ensure
that << original Moto Guzzi spare
parts>> only are used.
The use of non-genuine parts
invalidates every warranty right.
Warranty
The warranty is valid for a period
of six months with a limitation to
1 0.000 km (6000 miles) from the
selling date and expires in case of
modifications to the motorcycle,
participation to racing events or
use of not original accessories, or
original accessories which are
fitted not following SEIMM -
MOTO GUZZI directions.
Tires, accessories, or parts not
manufactured in the <c Seimm
Moto Guzzi I) factories are exclu-
ded from this guarantee.
Each new motorcycle is supplied
with a «voucher book» which has to
be kept carefully with all other
circulation papers as it is the only
document entitling the owner to
request warranty service from the
Seimm - Moto Guzzi dealers,
according to the general conditions
of sale,

12
CONTROLS AND ACCESSORIES
(fig. 3)
v
1
Front turn light signals.
2
Right front brake control lever.
3
Throttle control grip.
4
Speedometer.
5
Ignition key.
6
Left front brake and rear brake pedal.
7
Footrest.
8
Master cylinder, left front brake and rear
brake.
9
Saddle release lever.
10
Tail light.
11
Headlight.
12
Panel board.
13
Clutch lever.
\;
14
Voltmeter.
15
Rev-counter.
16
Lock set, fuel cap
opening.
17
Gearshift pedal.
18
Footrest, pillion.
19
Rear turn signal
indicators.
•”Right” or “ left" in the text are
intended as seen by the rider astride
the motorcycle.

13
6 7 ® 9,0
15 16 17 18 19

14 INSTRUMENTS AND CONTROLS
Instrument Panel
1 Voltmeter.
2 Rev-counter.
3 Speedometer, km
or miles.
4 Ignition key:
«OFF" In line with mark" C »;
machine stationary, key
removable (no contacts).
<< A>> In line with mark “C"
(turned clockwise):
machine ready to be started. All
circuits «ON ». Key not removable.
<<B>> In line with mark -O» (turned
clockwise): machine at standstill.
With switch" A" (fig. 5) in "PARK"
position, parking light" ON », Key
removable.
5 Warning light (green) left turn signal.
6 Warning light (green), "Neutral»
indicator. Lights up only when the
gearbox is in neutral.
7 Warning light (red), indicating current
delivery from generator. Should go out
when the engine has reached a certain
number of revolutions.
8 Warning light (red), oil pressure gauge.
Goes out when oil pressure is sufficient for
normal engine lubrication. If it does not, this
means oil pressure is not correct and in such
an event the engine should be immediately
stopped and all circuits checked over.
9 Warning light (red) indicating low level of
oil in the reservoir-master cylinder for the
front left and rear brakes. When this light
comes on, top up the fluid reservoir,
ensuring there are no leakages in
the hydraulic circuit.

10 Warning light (blue)
indicating high beam on. 11
Warning light (green)
indicating parking lights on.
12 Warning light (green), right
turn signal.
13 Switch for emergency flashers
(fitted on headlight support).
14 Zero reset for odometer.
Are fitted on the LlH side of the
handlebar. •• D" (horn) Horn
control.
Horn, flashing lights and turn signal
buttons (fig. 5)
Switch «A»
• PARK" Parking lights.
«ON.. Ignition dual beam lamp.
• OFF.. Lights off.
Switch •• B ••
With switch •• A •• in position ON:
«LO.. Low beam.
«HI" High beam.
Light switches (on left hand side of
handlebar) (fig. 5)
15
-
"c" (flash) Flashing light
control Switch <<E>>
<<R>> Right turn
<<L>> Left turn
Engine starting and stopping button (fig. 6)
It is located on the right handlebar.
With key mark •• A" in line with mark •• C»
(fig. 4), the vehicle is ready to be started.
To start the engine, proceed as follows:
- Ensure switch ••. B" is in position •• RUN"
- Pull the clutch lever completely .
- On a cold engine, adjust starter lever to
position
.A •• (fig. 28) .
- Press start button" A".
To stop the engine in an
emergency: - Move switch" B" to
position" OFF".
As soon as the engine stops, turn ignition
key (fig. 4) counterclockwise till mark
«OFF" is in line with mark •• C", and take
out the key from the lockset.
Starter lever (fig. 28)
This lever for cold starting is
located on the left side of the
vehicle .

16 - «A" Start position.
- "B" Riding
position.
Throttle twist grip control (<<G>>"
in fig. 6) It is located on the right
hand side of the handlebar: turning
it inwards opens the gas and vice
versa closes it.
To adjust the stroke of the throttle
grip action screw "0,,.
To harden the return of the
throttle grip act on screw "C".
E
B
Clutch control lever
It is on the left hand side of the
handlebar and it should be pulled
only for starting and gearshifting.
Control lever for R/H front brake
(«H" in fig. 6)
It is on the R/H handlebar and
controls the master cylinder for the
hydraulic front brake through a
suitable circuit.
5
H~
B
6

Left front and rear brake
control pedal (.F. in fig. 18)
Gearbox control pedal (fig. 7)
This pedal is centrally located on
the LlH side of the bike.
Positions: 17 ,
- low gear, lever end towards the ground
- 2nd, 3rd, 4th and high gear lever to
upward
- neutral between low and 2nd gee'
Before actuating this pedal, be sure
the clutch lever is pulled completely.
It is centrally located on the R/H side
of the vehicle and it is link
connected to the master cylinder.
It controls the left front brake and
rear brakes simultaneously.
Fuel filler cap (fig. 8)
To access filler cap «B» it is
necessary to turn key «A" clockwise
on the protection cover, then the
cover can be raised.

It is located on the right side of the
motorcycle. To access it: raise the saddle,
remove the right side cover, and the block
cover.
N. 6 fuses of 16 A are fitted.
Terminal block with fuses (fig. 10)
Are fitted under the tank, rear side.
The fuel tap has 3 positions:
ON Open, lever arrow upwards .
RES Reserve, lever arrow downwards.
OFF Closed, arrow on lever horizontal.
Fuse n. 1
Starter relay - Rear stop switch.
Fuse n. 2
Flashing light - Horn
Fuse n. 3
Warning lights: (neutral - gen - oil - brake fluid
high beam) - voltmeter - front stop switch -
high beam - low beam.
Fuse n. 4
Parking lights - Parking lights indicator - Panel
lights.
18 Fuel taps (fig. g)
,.

Fuse n. 5
Turn signal lights and their warning
lights.
Fuse n. 6
Available
Locking 19
- Turn the handiebar fully to the right.
- Insert the key in the lock set, turn it anti 'clock-
wise, push it right in, release it and slip it out.
Saddle lifting device (fig. 11)
Withdraw securing pin from the
right, remove grab strap" A ». and
push lever «B" forward.
To lock or unlock the steering,
proceed as follows:
Steering lock (<<A» of fig. 12)
Unlocking
- Insert the key in the lock set, turn it
Counterclockwise, release it, and
withdraw it.
Side Stand
This stand is used only for brief
stops. Since it is automatically
retractable, for long stops it is
advisable