MOTO GUZZI V750 Ambassador User manual

Ambassadol'
rider's
handbook

Ambassador
V 750
RIDER ' S HANDBOOK

2
INTRODUCTION This booklet is intended to provide owners
with the necessary information on oper ating
and maintaining their machines for maximum
efficiency.
The manual should be read very carefully
as most troubles
and failures arising from
neglect or poor maintenance will be avoided
if all the instructions herein contained are
strictly followed.
Don't forget that all
major overhaul jobs and
repairs are best carried out by officially
appointed Moto Guzzi dealers who have the
necessary facilities to quickly and competen.
tly repair your Moto Guzzi.
IN D E X Running
in
Controls and accessories
Identification data
Tool ki t
Main features _ Engine
Frame
Instr uments and controls
Ignition key
Starting button
Ignition swit ch keys
Steering lock
Steering lock keys
Dimmer switch
and horn button
Clutch lever
Twist grip throttle control
Air lever
Gearshift lever
Front brake lever
Rear brake pedal
Riding instructions
lubrication chart
lubrication and general m ai nte-
nance
Servicing instruc ti ons
lubrication of engine
Oil pressure relief valve
Oil pressure gauge
lubrication of transmission
lubrication of rear wheel drive
lubrication of fr ont fork and hy-
draulic dampers
lubrication of bevels in the stee~
ring
....
~~
p,,.
5
• 6
•
JO
•
11
• 12
•
16
• 18
• 19
• 19
• 20
•
20
•
20
•
20
• 20
• 20
•
21
•
21
•
21
•
21
• 22
•
25
• 27
• 29
•
29
•
31
•
31
•
31
• 32
• 33
• 33
3

4
Lubrication of whee! bearings
Lubrication of rear fork bearings
C(!rburation
Air filter
Fuel tank
Fuel taps
Mufflers
Valve gearing
Tappet clearance
Checking valve riming
Ignition
Distributor
Spark plugs
Checking of ignition timing
Checking
of ignition advance by
stroboscope lamp
Adjustments
Generator belt
Clutch lever
Steering
Steering lock
Front brake lever
Rear brake pedal
Rear suspension units
Removal of wheels
Front wheel
Rear wheel
Electrical equipment
Wiring diagram -
USA model
Wiring diagram -European model
p ~ ge 33
• 33
• 35
• 40
• 40
• 41
• 42
• 43
• 43
• 43
• 46
• 46
• 47
• 47
• 48
• 51
• 51
• 51
• 51
• 54
• 55
• 57
• 57
• 60
• 60
• 60
• 62
• 71
• 72
RUNNING IN
After the
first 500 kms.
(300 miles )
Ev er y 500 kms.
(300 mile s)
"5iiJ
- ~
During the first 1600 kms. (1000 miles), a
new
or overhauled machine ought to be used
with some intelligence as the efficiency, per-
formance, and life of the engine are largely
dependant on how it is run in.
The engine should never be allowed to reach
a high
number of revolutions before it has
had a chance to
warm up sufficiently. Never
ride the machine
at the highest permissible
speeds for each gear before the machine has
been well broken in.
Should th eengine speed drop off consider-
ably on an uphill grade, a lower gear should
be immediately engaged. In case of overhea-
ting,
it is best to st op and allow the engine
to cool down.
Under no circumstances whatever should the
following speeds be exceeded in the running
in period.
Maximum permissible
speeds:
Distance: up to 800 kms. (500 miles):
in low gear 45 kms. (28 miles)
in second gear 65 kms. (40.5 miles)
in third gear 85 kms. (53 mile})
in high gear 110 kms. (68 miles')
from 800 to 1600 kms.
(500 to 1000 miles):
in low ge(!( 55 kms. (34.5 miles)
in second gear 80 kms. (50 miles)
in third gear 105 kms. (65 miles)
in high gear 135 kms. (84 miles)
From 1600 to 3000 kms. (1000 to 1 800
miles) the speed can be gradually increased
up to the maximum permissible limits.
Change the engine oil.
Tighten all nuts and bolts.
Check valve clearance.
Check distributor points.
Check oil level. Correct level
is in betwEIen
the minimum and maximum mark on the
filler cap dipstick.
5

CONTROLS AND ACCESSORIES
(See fig. I )
•
1. Front brake lever
2. Air control lever
3.
Throttle control grip
4. Slarter button
5. Filler cap
6. Gearshift lever
7. Pillion footrests
8. Pillion handgrip
9. Headlight
10. Speedometer
11. Ignition key
12. Rev-counter
13. Clutch lever
14.
light switch and horn button
15 . Side stand
16. Rear brake pedal
17 . Footrests
18. Center sland
19. Tail light
The machine can also be supplied with gear-
shift lever on the left and rear brake pedal!
on the right.
N.B, • TIM I ... ml ... ri ght " a nd • 1ft,,, In ,he lui
If. uo.-d In 1M .. n .. t ... ., would app-a . 10 one
IIUi", In , ... udell •.
1
tt<:"'--" - 2
~ --- 3
::----- 4
14
5
15
16
17
1
Fig . 1
7

8 9

Identification
data
(See fig. 4)
10
Every machine is identified with a serial num-
ber which is stamped on the frame down tube
end on the left hend crankcase cover.
Fig . 4
Tool kit
(See fig. 5)
1. Box wrench, 19-21-22 mm.
2. Open ended wrench, 17-19 mm.
3. Open ended wrench, 10·11 mm.
4. Tappet adjusting wrench
5. Box wrench, 8-9 mm.
6. Allen key (5 hex)
7.
Box wrench, 10·14 mm.
8. Universal pliers
9. Adjustable wrench
10. Screwdriver
11. Ring wrench, 27 mm.
12. Rear
damper adjusting wrench
13.
Tool bag
Fig. 5
11

MAIN FEATURES
ENGINE
( Se a fig. 5/1)
12
Cycle
Number
of cylinders
Cylinder
dispo sition
Bore
Stroke
Disp l a~emenl
4 strokes
,
«v,. 90"
83 mm . (3 . 26")
70 mm. (2.75 " )
757.486 ce. ( 46.21
cll.in.)
Fig . 5/ 1
Valve gear
Compression ratio: 9 to 1
Re vs at maximum
engine speed 6500 r.p.m.
Outpu t at mi)Kimum
engine speed
Crankcase
Cylinders
Cy l inder heads
Crankshaft
Crankshaft
supports
Conne<:ting rods
Pistons
60 HP 5AE
in light alloy
in light alloy with hard
chr omed barrels
in light alloy, hemisphe-
rical, with special cast
iron inserted seats.
steel construction
in anti·friction mate rial
pressed in 2 suitable
housings (as used in al l
Fl race ca r s)
steel construction with
AL·TIN alloy thin wa ll
bearings
in light alloy
O.H.v., push rod operated via the camshaf t
in the crankcase and gear driven by the
crankshaft.
Inlet:
- opens 24 <> before Toe
-closes 58 <> after BOC
E)(haust:
-opens 58" after
BDC
-closes 22'" after TDC
Rocker clearance for valve timing:
- 0.5 mm. (.0196")
Normal rocker clearance (co ld engine):
inlet 0.15 mm. (.0059")
-e)(haust 0.25 mm. (.0098")

Lubrication
Cooling
Ignilion
14
2 DeIl'Orto carburetors type VHB 29 CD
(right) and VHB 29 CS (left) both gravity
fed from
the tank.
Standard ca rburetor $etting
Ch oke 29 mm.
Throttle slide
60
-Atomizer 265
-Main jet 1 45
-Pilot jet 45
-
Starter atomizer 80
With needle SV9 set at second notch from
top: idling screw open I and 112 turns for
the left carbu r etor and I and 3n . 2 turns
for the right carburetor.
With needle SV5 third notch from top:
idling screw open 1 1f~ to 2 turns for the
left
carburetor and 2.21 12 turns for the right
carburetor.
Air intake provided with dry f il ler .
Pressure, by gear pump driven by the crank-
shaft.
Oil strainer in crankcase.
No rmal lubrication pressure 3.8· 4 .2 kgs/sq.
cm.
(54 to 60 Ibs sq.in.) controlled by relief
villive.
Electrically controlled oil pressure gauge.
By air. Cylinder and cylinder head deeply
finned.
By battery with automatic advance distri-
butor.
Initial advance: 10".
Automatic advillnce: 28".
Ignition timing 38" full advance.
Starting
Exh aust system
TRANSMISSION
Clutch
Gear box
Se<o ndary
drive
Contact breaker gap: 0.42-0.48 mm . (.016"-
.0IS·').
Spark plug: n. 225 in Bosch-Marelli scale or
equivalent_
Plugs point
gap: 0.6 mm. (.023")
Ignitioo coil.
Electric starter with electromagnetic ratchet
control.
Ring
gear bolted on flwheel. Operated by
sta rter button.
Dual exhaust pipes and mufflers.
Twin driven plates, dry type, locillted on the
flywheel. Controlled by lever
on l eft hand-
lebar.
Four speeds, frontal engagement. Conslllnt
mesh gears. Cush drive incorporated.
Separate case bolted
on crankclls fI , ope rated
by rocker pedal on the right side of the
machine.
Engine gear-box
ratio:
Inlernal gear ratios:
- Low gear
-Serond
gear
-Third gear .
-High gear
to 1.375
(16-22)
to 2.230 (13·29)
to 1.333 (18 · 24)
to 0.954 (22·21)
to 0.750 (24-18)
By constant speed double joint cardan shaft
lllyshaft bevel gears-rear wheel
ratio:
Overall gear ralios:
- Low gear .
-Serond gear
-Third gear
-High gear _
4.375 (8-35)
to 13 .4 15
to 8.0 18
10 5.738
to 4.511
15

ijljW1!l ®m
FRAME
Suspension
Wheels
Tires
Tire pressure
Brakes
Overall
dimensions
and weight
16
Duplex cradle, tubular structure.
Telescopic front fork incorporating hydraulic
dampers.
Rear swinging fork with externally adjustable
springs.
18)(3 rims, front and rear.
4.00)(18 front and rear, block type (high
speed).
Front
tire:
solo p<lssenger !
with 1.5 kgs/sq.cm. =
21 p.s.i.
Rear
tire:
solo
with passenger 1.8 kgs/sq.cm. = 25 p.s.i. 2.0 kgs/sq.cm. = 28 p.s.i.
N. S .. The ~bove rec om me nd ation is for norm at
riding ( uui sing spee d). If using the machi ne ~ t
con. l an t h ig h speed Or On motorw ly", th e ~ bov e
pr euu r e. should be i ncr eao ed by 0 .2 kg ./l q. cm .
( 2.8 p .•. i. J.
Twin leading shoes front brake operated by
hand lever
on the right handlebar.
Large rear
brake operat ed on left hand side
of machine.
Wheelbase 1.470 mts. (about 57.8"
Length 2.245 mts. {about
88.3"'
Width 0.830 mts.
(about 32.6"
Height (
dry)
1.070 mts. (about 4 2.1"
Minimum ground
clearance 0.150 mts. (about 5.9"
Curb weight 228 kgs. (about 502 Ibs.)
Performance Maximum permissible speeds and gradients
climbable
in each gear, solo riding.
Low gear: 62 kms/h ( 38.5 m.p.h.)
climbing ability: 90%
Second gear: 104.250 kms/h (64 .6 m.p.h.
climbing ability:
40%
Third gear: 145.250 kms/h (89.2 m.p.h.)
climbing ability:
20%
High gear: 185.276 kms/h (liS m.p.h.)
climbing ability:
8%
Fuel consumption Measured according to CUNA standards:
37 m.p.g. (US).
Fuel . Hld oil Fuel tank: 22.5 liters (5.84 US gls.) inclu-
ca pacities ding about 4 liters reserve (about 1 US gl.).
Petrol 98 NO (Regular octane) - Sump 3 liters
(3 1j -l quarts) Shell Super Motor Oil 100 -
Transmission 0.750 liters
(1 % pints) Shell
Spirax 90 E.P. - Re<lr wheel drive 0.300 liters
(5/8 pints) Shell Spirax 90 E.P. -Front fork
dampers 0.160 liters = 5.4 oz
US Shell Tel-
lux 33.
17