MOTO GUZZI 850 Le Mans III Instruction manual

~)(LeMans)
(HEE)
WORKSHOP MANUAL
COD. 289201 51
Additions to the Workshop manual for the models V1000 G50 and 1000 SP -Code 17920161

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- TECHNICAL PUBLICATIONS
CODE 28 92 01 51
1000K - 1-82 -Printed in Italy - Tecnopress/Bergamo

~ __________________________________________________________________ ~ 22 8
HINTS ON THE PROPER USE OF THIS MOTORCYCLE
Due to its exceptionally high feature, this motor-
cycle can be considered as in the racing ma-
chine 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 asforall racing bikes,it hasto be used ac-
cordingly .
Forinstance,
forfuel feed this model isfitted with
carburettors with pumps and if the twist grip is
not used correctly in accordance with the en-
gine revolutions, there might be
an excess of
fuel which is ejected bythe carburettors, ending
in the air filter box of the carburettors same.
When travelling at lowspeed
or in otherwordsat
low revs,
it is necessaryforthe throttle gripto be
used with care since the immission of a greater
quantity of fuel mi
ght not be fully absorbed by
the engine.
At high speed, also in case
of abrupt accelera-
tions, the fuel is entirely absorbed and used up
bythe engine,thuseliminatingthis riskand
con-
ferring to this model the brilliant « kicking up»
qualities that make it one
of its outstanding fea-
tures.
175

INDEX
Cylinders
Pistons
Con-rods
Crankshaft
Carburettors
Float levelling
Replacing the air filter
Front fork lubrication
Oil pneumatic shock absorbers

II MAIN FEATURES
ENGINE
-cylinder disposition
-bore
-stroke
-displacement
-compression ratio
-max torque
VALVE GEARING
CARBURATION
LUBRICATION
GENERATOR ALTERNATOR
IGNITION
-ignition data
-contact breaker points gap
-spark plugs
-plug points gap
-ignition coils
STARTING
TRANSMISSIONS
CLUTCH
PRIMARY DRIVE
GEARBOX
-gear ratios:
Low gear
2nd gear
3rd gear
4th gear
5th gear
SECONDARY DRIVE
-ratio
-overall gear ratios
(engine-wheel)
Low gear
2nd gear
3rd gear
4th gear
5th gear
twin cylinder -4-stroke
«V,. 90°
83 mm
78 mm
844 cc
9.8 to 1
7.6 kgm at 6200 rpm
O. H.V., push rod operated
n. 2 carburettors <c Dell'Orto,. type PHF 36 B (D) (right)
PHF 36 B (S) (left)
pressure, by gear pump
wire gauze and cartridge filters in oil sump
normal lubrication pressure 3.8 to 4.2 kg/sq cm
(pressure relief control valve in the sump)
oil pressure sender unit in the crankcase
fitted in the front part of the crankshaft (14 V - 20 A)
coil-battery ignition with double contact breaker
and automatic advance with centrifugal masses
ignition advance (fixed) 8°
automatic advance 26°
full advance (f. + a.) 34°
0.37...;... 0.43 mm
Bosch W 5 D
Lodge 2 HLNY
0.6 mm
n. 2 fitted on the frame
electric starter (12V - 0.7 KW) with electromagnetic
ratchet control ring gear bolted on the flywheel
starter button (START) fitted on the R/H side of handlebar
twin driven plates, dry type
fitted on the flywheel side
hand controlled by lever on left handlebar
by gears, ratio 1 to 1.235 (2 = 17/21)
5 speeds, frontal engagement, constant mesh gears.
Cush drive incorporated
pedal operated on the UH side of the bike
1 to 2 (2 = 14/28)
1 to 1.388 (2 = 18/25)
1 to 1.047 (2=21/22)
1 to 0.869 (2 = 23/20)
1 to 0.750 (2 = 28/21)
by cardan shaft, bevel gear set
1 to 4. 714 (2 = 7/33)
1 to 11.643
1 to 8.080
1 to 6.095
1 to 5.059
1 to 4.366
177