VESPA LX 150 4T USA Instruction manual

WORKSHOP MANUAL
633572
LX 150 4T USA

WORKSHOP
MANUAL
LX 150 4T USA
The descriptions and illustrations given in this publication are not binding. While the basic specifications
as described and illustrated in this manual remain unchanged, PIAGGIO-GILERA reserves the right, at
any time and without being required to update this publication beforehand, to make any changes to
components, parts or accessories, which it considers necessary to improve the product or which are
required for manufacturing or construction reasons.
Not all versions/models shown in this publication are available in all countries. The availability of single
versions should be checked at the official Piaggio sales network.
"©Copyright2007-PIAGGIO&C.S.p.A.Pontedera.Allrightsreserved.Reproductionofthispublication
in whole or in part is prohibited."
PIAGGIO & C. S.p.A. - After-Sales
V.le Rinaldo Piaggio, 23 - 56025 PONTEDERA (Pi)

WORKSHOP MANUAL
LX 150 4T USA
This workshop manual has been drawn up by Piaggio & C. Spa to be used by the workshops of Piaggio-
Gilera dealers. This manual is addressed to Piaggio service mechanics who are supposed to have a
basic knowledge of mechanics principles and of vehicle fixing techniques and procedures. Any important
changes made to the vehicles or to specific fixing operations will be promptly reported by updates to this
manual. Nevertheless, no fixing work can be satisfactory if the necessary equipment and tools are
unavailable. It is therefore advisable to read the sections of this manual relating to specific tools, along
with the specific tool catalogue.
N.B. Provides key information to make the procedure easier to understand and carry out.
CAUTION Refers to specific procedures to carry out for preventing damages to the vehicle.
WARNING Refers to specific procedures to carry out to prevent injuries to the repairer.
Personal safety Failure to completely observe these instructions will result in serious risk of personal
injury.
Safeguarding the environment Sectionsmarked with this symbol indicatethe correct use of thevehicle
to prevent damaging the environment.
Vehicle intactness The incomplete or non-observance of these regulations leads to the risk of serious
damage to the vehicle and sometimes even the invalidity of the guarantee.

INDEX OF TOPICS
CHARACTERISTICS CHAR
TOOLING TOOL
MAINTENANCE MAIN
TROUBLESHOOTING TROUBL
ELECTRICAL SYSTEM ELE SYS
ENGINE FROM VEHICLE ENG VE
ENGINE ENG
SUSPENSIONS SUSP
BRAKING SYSTEM BRAK SYS
CHASSIS CHAS
PRE-DELIVERY PRE DE
TIME TIME

INDEX OF TOPICS
CHARACTERISTICS CHAR

Rules
This section describes general safety rules for any maintenance operations performed on the vehicle.
Safety rules
- If work can only be done on the vehicle with the engine running, make sure that the premises are well-
ventilated, using special extractors if necessary; never let the engine run in an enclosed area. Exhaust
fumes are toxic.
- The battery electrolyte contains sulphuric acid. Protect your eyes, clothes and skin. Sulphuric acid is
highly corrosive; in the event of contact with your eyes or skin, rinse thoroughly with abundant water
and seek immediate medical attention.
- The battery produces hydrogen, a gas that can be highly explosive. Do not smoke and avoid sparks
or flames near the battery, especially when charging it.
- Fuel is highly flammable and it can be explosive given some conditions. Do not smoke in the working
area, and avoid naked flames or sparks.
- Clean the brake pads in a well-ventilated area, directing the jet of compressed air in such a way that
you do not breathe in the dust produced by the wear of the friction material. Even though the latter
contains no asbestos, inhaling dust is harmful.
Maintenance rules
- Use original PIAGGIO spare parts and lubricants recommended by the Manufacturer. Non-original or
non-conforming spares may damage the vehicle.
- Use only the appropriate tools designed for this vehicle.
- Always use new gaskets, sealing rings and split pins upon refitting.
- After removal, clean the components using non-flammable or low flash-point solvents. Lubricate all
the work surfaces, except tapered couplings, before refitting these parts.
- After refitting, make sure that all the components have been installed correctly and work properly.
- For removal, overhaul and refit operations use only tools with metric measures. Metric bolts, nuts and
screws are not interchangeable with coupling members with English sizes. Using unsuitable coupling
members and tools may damage the scooter.
- When carrying out maintenance operations on the vehicle that involve the electrical system, make
suretheelectricconnectionshavebeenmadeproperly,particularlythegroundandbatteryconnections.
LX 150 4T USA Characteristics
CHAR - 7

Vehicle identification
VEHICLE IDENTIFICATION
Specification Desc./Quantity
Chassis prefix ZAPM 428 F5
engine prefix M442M÷1001
Dimensions and mass
DIMENSIONS AND WEIGHT
Specification Desc./Quantity
Curbside weight 110 ± 5 kg
Maximum height 1140 mm
Width 740 mm
Wheelbase 1280 mm
Length 1800 mm
Engine
ENGINE
Specification Desc./Quantity
Engine Single-cylinder, 4-stroke Piaggio LEADER
Timing system Single overhead camshaft (SOHC) with 2 valves
Valve clearance intake 0.10
outlet 0.15
Bore x stroke 62,6 x 48.6 mm
Cubic capacity 150,46 cm³
Compression ratio 10.5: 1
Carburettor KEIHIN CVEK26
Engine idle speed approx. 1600 ÷ 1800 rpm
Start-up Electric
Max. power 11.6 hp at 7750 rpm
Cooling Forced air circulation.
Transmission
TRANSMISSION
Specification Desc./Quantity
Transmission With automatic expandable pulley variator with torque server,
V belt, automatic clutch, gear reduction unit and transmission
housing with forced air circulation cooling.
Characteristics LX 150 4T USA
CHAR - 8

Capacities
CAPACITY
Specification Desc./Quantity
Engine oil 61 in³ (1,000 cm³)
Rear hub oil ~ 100 cm³
Fuel tank capacity ~ 8.5 litres (2 l of which is reserve)
Electrical system
ELECTRICAL SYSTEM
Specification Desc./Quantity
Start-up Electric
Spark plug Champion RG6YC- NGK CR7EB
Frame and suspensions
FRAME AND SUSPENSIONS
Specification Desc./Quantity
Chassis Unitised body made of stamped plate.
Steering and suspensions Steering tube articulated on the front wheel carrier hub; heli-
coidal spring suspension and double-acting hydraulic shock
absorber; rear with double-acting shock absorber and coaxial
spring adjustable to 4 positions at preloading.
Brakes
BRAKES
Specification Desc./Quantity
Front brake Disc brake (Ø 200 mm) with hydraulic control (lever on the far
right of the handlebar) and fixed calliper.
Rear brake Ø110 mm drum brake
Wheels and tyres
WHEELS AND TYRES
Specification Desc./Quantity
Front wheel rim Die-cast aluminium alloy; 2.50 x11"
Front tyre Tubeless; 110/70-11"
Rear wheel rim Die-cast aluminium alloy; 3.00 x 10"
Rear tyre Tubeless; 120/70-10"
Front tyre pressure 1.6 bar
Rear tyre pressure 2 bar
Rear wheel pressure (rider and passenger): 2.3 bar
LX 150 4T USA Characteristics
CHAR - 9

Secondary air
In order to reduce polluting emissions, the vehicle
is furnished with a catalytic converter in the muf-
fler.
To favour the catalytic process, an extra amount
of oxygen is added via a secondary air system
(SAS).
This system allows more oxygen to be added to
the unburned gases before they reach the con-
verter, thus improving the action of the catalytic
converter.
Theairenters the exhaust duct from the head, and
is purified by a black filter.
The system is fitted with a control valve that disa-
bles operation while decelerating to avoid unwan-
ted noise.
To ensure the best functioning of the SAS system,
every12,000km the scooter should be taken to an
Authorised Piaggio Service Centre to have the
filter cleaned (Scheduled maintenance operations
section).
Thefilterspongeshouldbecleanedwithwaterand
mild soap, then it should be dried with a cloth and
slight blows of compressed air.
CAUTION
CONTACT AN AUTHORISED PIAGGIO SERVICE CENTRE
TO CARRY OUT THESE OPERATIONS.
Carburettor
150cc Version
Kehin
CARBURETTOR SETTING
Specification Desc./Quantity
Type CVEK26
Throttle valve diameter Ø 26.5
Characteristics LX 150 4T USA
CHAR - 10

Specification Desc./Quantity
Diffuser diameter Ø 26.4
Setting stamping 265A
Maximum jet 82
Maximum air jet (on the body) 85
Tapered pin stamping NELA
Throttle valve spring 130 ÷ 180 gr.
Minimum jet 35
Idle air jet (on the body) 150
Idle mixture adjustment screw initial opening 1 ¾
Starter jet 42
Starter air jet (on the body) Ø 1.5
Starter pin travel 10 mm (at 24°)
Starter resistance 20 Ohm (at 24°)
Tightening Torques
LUBRICATION
Name Torque in Nm
Hub oil drainage cap 15 ÷ 17
Oil filter 4 ÷ 6
Oil pump cover screws 5 - 6
Oil pump screws 5 - 6
Pump control pulley screw 10 ÷ 14
Chain cover screws 4 ÷ 6
Oil sump screws 10 ÷ 14
Minimum oil pressure sensor 12 ÷ 14
Blow-by recovery duct fixing screws 3 - 4
HEAD AND CYLINDER
Name Torque in Nm
Ignition spark plug 12 ÷ 14
Head cover screws 11 ÷ 13
Nuts fixing head to cylinder (*) 28 ÷ 30
Head fixing screws (external) 11 ÷ 13
Starter ground screw 7 ÷ 8.5
Flywheel cover screw 1 ÷ 2
Flywheel air manifold screw 3 ÷ 4
Pressure reducer counterweight retainer 7 ÷ 8.5
Camshaft pulley screw 12 ÷ 14
Timing chain tensioner slider screw 10 ÷ 14
Starter ground support screw 11 ÷ 15
Tensioner screws 11 ÷ 13
Timing chain tensioner central screw 5 - 6
Camshaft retention plate screw 5 - 6
Nut fixing muffler to cylinder head 16 ÷ 18
Head intake manifold screw 11 ÷ 13
TRANSMISSION
Name Torque in Nm
Drive pulley nut 75 ÷ 83
Transmission cover screw 11 ÷ 13
Driven pulley shaft nut 54 ÷ 60
Rear hub cap screw 24 ÷ 27
Clutch unit nut on driven pulley 45 ÷ 50
FLYWHEEL
Name Torque in Nm
Flywheel fan screws 3 ÷ 4
Stator assembly screws (°) 3 ÷ 4
Flywheel nut 52 ÷ 58
Pick-up screw 3 ÷ 4
LX 150 4T USA Characteristics
CHAR - 11

(°) Apply LOCTITE 243 threadlock
CRANKCASE AND CRANKSHAFT
Name Torque in Nm
Internal engine crankcase bulkhead (transmission-side half
shaft) screws 4 ÷ 6
Oil filter on crankcase fitting 27 ÷ 33
Rear brake cam tightening screw 11 ÷ 13
Engine-crankcase coupling screws 11 ÷ 13
Pre-filter cap 24 ÷ 30
Starter motor fixing screw 11 ÷ 13
Muffler to crankcase fixing screws 24 ÷ 27
Engine oil drainage cap 24 ÷ 30
STEERING ASSEMBLY
Name Torque in Nm
Steering upper ring nut 35 ÷ 40
Lower steering ring nut 12 - 14
Handlebar fixing screw 50 ÷ 55
FRAME ASSEMBLY
Name Torque in Nm
Swinging arm pin - frame 44 ÷ 52
Engine-swinging arm bolt 33 ÷ 41
Stand bolt 32 ÷ 40
Swinging arm silent-block containment bolt 33 ÷ 41
FRONT SUSPENSION
Name Torque in Nm
Shock absorber upper nut 20 ÷ 30
Front wheel axle nut 75 ÷ 90
Shock absorber upper bracket bolts 20 ÷ 25
Wheel rim screws 20 ÷ 25
Shock absorber lower bolts (°) 20 ÷ 27
FRONT BRAKE
Name Torque in Nm
Brake fluid pump-hose fitting 8 ÷ 12
Brake fluid pipe-calliper fitting 20 ÷ 25
Screw tightening calliper to the support 20 ÷ 25
Brake disc screw 5 ÷ 6.5
Oil bleed valve (on the calliper) 10 ÷ 12
Handlebar pump 7 ÷ 10
REAR SUSPENSION
Name Torque in Nm
Rear wheel axle 104 ÷ 126
Lower shock absorber clamp 33 ÷ 41
Shock absorber/frame nut: 20 ÷ 25
Overhaul data
Assembly clearances
Characteristics LX 150 4T USA
CHAR - 12

Cylinder - piston assy.
COUPLING BETWEEN PISTON (ASSO-WERKE) AND CYLINDER
Name Initials Cylinder Piston Play on fitting
Coupling A 62.580 ÷ 62.587 62.533 ÷ 62.540 0.040 ÷ 0.054
Coupling B 62.587 ÷ 62.594 62.540 ÷ 62.547 0.040 ÷ 0.054
Coupling C 62.594 ÷ 62.601 62.547 ÷ 62.554 0.040 ÷ 0.054
Coupling D 62.601 ÷ 62.608 62.554 ÷ 62.561 0.040 ÷ 0.054
Coupling 1st oversize A1 62.780 ÷ 62.787 62.733 ÷ 62.740 0.040 ÷ 0.054
coupling 1st oversize B1 62.787 ÷ 62.794 62.740 ÷ 62.747 0.040 ÷ 0.054
Coupling 1st oversize C1 62.794 ÷ 62.801 62.747 ÷ 62.754 0.040 ÷ 0.054
Coupling 1st oversize D1 62.801 ÷ 62.808 62.754 ÷ 62.761 0.040 ÷ 0.054
Coupling 2nd oversize A2 62.980 ÷ 62.987 62.933 ÷ 62.940 0.040 ÷ 0.054
Coupling 2nd oversize B2 62.987 ÷ 62.994 62.940 ÷ 62.947 0.040 ÷ 0.054
Coupling 2nd oversize C2 62.994 ÷ 63.001 62.947 ÷ 62.954 0.040 ÷ 0.054
Coupling 2nd oversize D2 63.001 ÷ 63.008 62.954 ÷ 62.961 0.040 ÷ 0.054
Coupling 3rd oversize A3 63.180 ÷ 63.187 63.133 ÷ 63.140 0.040 ÷ 0.054
Coupling 3rd oversize B3 63.187 ÷ 63.194 63.140 ÷ 63.147 0.040 ÷ 0.054
Coupling 3rd oversize C3 63.194 ÷ 63.201 63.147 ÷ 63.154 0.040 ÷ 0.054
Coupling 3rd oversize D3 63.201 ÷ 63.208 63.154 ÷ 63.161 0.040 ÷ 0.054
COUPLING BETWEEN PISTON (RIGHT WAY) AND CYLINDER
Name Initials Cylinder Piston Play on fitting
Coupling A 62.580 ÷ 62.587 62.541 ÷ 62.548 0.032 ÷ 0.046
Coupling B 62.587 ÷ 62.594 62.548 ÷ 62.555 0.032 ÷ 0.046
Coupling C 62.594 ÷ 62.601 62.555 ÷ 62.562 0.032 ÷ 0.046
Coupling D 62.601 ÷ 62.608 62.562 ÷ 62.569 0.032 ÷ 0.046
Piston rings
PISTON RINGS
Name Description Dimensions Initials Quantity
Compression ring 62.6x1 A 0.15 ÷ 0.30
Oil scraper ring 62.6x1 A 0.20 ÷ 0.40
Oil scraper ring 62.6x2.5 A 0.20 ÷ 0.40
Compression ring 1st
oversize 62.8x1 A 0.15 ÷ 0.30
Oil scraper ring 1st
oversize 62.8x1 A 0.20 ÷ 0.40
Oil scraper ring 1st
oversize 62.8x2.5 A 0.20 ÷ 0.40
Compression ring 2nd
oversize 63.0 x 1 A 0.15 ÷ 0.30
Oil scraper ring 2nd
oversize 63.0 x 1 A 0.20 ÷ 0.40
Oil scraper ring 2nd
oversize 63.0 x 2.5 A 0.20 ÷ 0.40
Compression ring 3rd
oversize 63.2 x 1 A 0.15 ÷ 0.30
Oil scraper ring 3rd
oversize 63.2 x 1 A 0.20 ÷ 0.40
Oil scraper ring 3rd
oversize 63.2 x 2.5 A 0.20 ÷ 0.40
LX 150 4T USA Characteristics
CHAR - 13

Crankcase - crankshaft - connecting rod
AXIAL CLEARANCE BETWEEN CRANKSHAFT AND CONNECTING ROD
Name Description Dimensions Initials Quantity
Half-shaft, transmission
side 16.6 +0-0.05 A D = 0.20 - 0.50
Flywheel-side half-shaft 16.6 +0-0.05 B D = 0.20 - 0.50
Connecting rod with PP 18 -0.10 -0.15 C 0.20 ÷ 0.50
Crank pin width 51.400 E
AXIAL CLEARANCE BETWEEN CRANKSHAFT AND CRANKSHAFT HALF-BEARINGS
Name Description Dimensions Initials Quantity
Crankshaft Category 1 28.998 ÷ 29.004
Crankshaft Class 2 29.004 ÷ 29.010
Crankcase Category 1 32.953 ÷ 32.959
Crankcase Category 2 32.959 ÷ 32.965
Crankshaft half-bearing Category B - blue 1.973 ÷ 1.976
Crankshaft half-bearing Type C - yellow 1.976 ÷ 1.979
Crankshaft half-bearing Category E - green 1.979 ÷ 1.982
Crankshaft category 1 -
Crankcase category 1 E - E
Crankshaft category 1 -
Crankcase category 2 C - C
Crankshaft category 2 -
Crankcase category 1 C - C
Crankshaft category 2 -
Crankcase category 2 B - B
Crankshaft/crankcase axial clearance: 0.15 ÷ 0.40
Characteristics LX 150 4T USA
CHAR - 14

Slot packing system
- Temporarily fit the cylinder on the piston, without the base gasket.
- Fit a comparator on the specific device
- Reset the comparator on an inspection surface with an average preload of 5 mm for example Keeping
the reset position, fit the device on the cylinder and lock it with 2 nuts as shown in the figure.
- Turn the crankshaft until the upper dead centre point (inversion point of the comparator rotation).
- Calculate the difference between the two measurements: using the table below find the thickness of
thecylinderbase gasket to be used for reassembly. Correct identification of the thickness of the cylinder
base gasket helps keep the correct compression ratio.
- Remove the specific device and cylinder.
Characteristic
Compression ratio
10.5: 1
PACKING SYSTEM
Specification Desc./Quantity
Value measured 1 ÷ 1.1
Thickness 0.8 ± 0.05
Value measured 1.1 ÷ 1.3
Thickness 0.6 ± 0.05
Value measured 1.3 ÷ 1.4
Thickness 0.4 ± 0.05
LX 150 4T USA Characteristics
CHAR - 15

Products
TABLE OF RECOMMENDED PRODUCTS
Product Description Specifications
AGIP ROTRA 80W-90 Rear hub oil SAE 80W/90 Oil that exceeds the re-
quirements of API GL3 specifications
AGIP CITY HI TEC 4T Oil to lubricate flexible transmissions
(brakes, throttle control and odometer) Oil for 4-stroke engines
AGIP FILTER OIL Oil for air filter sponge Mineral oil with specific additives for in-
creased adhesiveness
AGIP CITY HI TEC 4T Engine oil SAE5W-40,APISL,ACEAA3,JASOMA
Synthetic oil
AGIP GREASE MU3 Grease for odometer transmission gear
case Soap-based lithium grease with NLGI 3; ISO-L-XBCHA3, DIN K3K-20
AGIP BRAKE 4 Brake fluid FMVSS DOT 4 Synthetic fluid
MONTBLANC MOLYBDENUM
GREASE Grease for driven pulley shaft adjusting ring and movable driven pulley housing Grease with molybdenum disulphide
AGIP GREASE PV2 Grease for steering bearings, bolt seat-
ings for swinging arms and contact sur-
face of driven pulley spring (only pulley
side)
Lithium soap and zinc oxide grease NLGI
2; ISO-L-XBCIB2
AGIP GP 330 Grease for brake levers, throttle White calcium complex soap-based
spraygrease withNLGI 2; ISO-L-XBCIB2
Characteristics LX 150 4T USA
CHAR - 16

INDEX OF TOPICS
TOOLING TOOL

TOOLS
Stores code Description
001330Y Tool for fitting steering seats
001467Y009 Driver for OD 42-mm bearings
001467Y013 Pliers to extract ø 15-mm bearings
002465Y Pliers for circlips
005095Y Engine support
008564Y Flywheel extractor
Tooling LX 150 4T USA
TOOL - 18

Stores code Description
020004Y Punch for removing fifth wheels from
headstock
020055Y Wrench for steering tube ring nut
020074Y Support base for checking crankshaft
alignment
020150Y Air heater support
020151Y Air heater
020193Y Oil pressure gauge
LX 150 4T USA Tooling
TOOL - 19

Stores code Description
020262Y Crankcase splitting strip
020263Y Sheath for driven pulley fitting
020287Y Clamp to assemble piston on cylinder
020306Y Punch for assembling valve seal rings
020329Y MityVac vacuum-operated pump
020330Y Stroboscopic light to check timing
Tooling LX 150 4T USA
TOOL - 20