PIAGGIO B 125 Manuel d'instructions

WORKSHOP MANUAL

618162

B 125-250

WORKSHOP

MANUAL

B 125-250

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.

in whole or in part is prohibited."

PIAGGIO & C. S.p.A. - After-Sales

V.le Rinaldo Piaggio, 23 - 56025 PONTEDERA (Pi)

WORKSHOP MANUAL

B 125-250

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

COOLING SYSTEM COOL 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 open 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 the tapered couplings before refitting.

- 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 measurement. 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.

B 125-250 Characteristics

CHAR - 7

Vehicle identification

VEHICLE IDENTIFICATION (125)

Specification Desc./Quantity

Chassis prefix (125) ZAPM 28400 ÷ 1001

Engine prefix (125) M284M

VEHICLE IDENTIFICATION (250)

Specification Desc./Quantity

Chassis prefix (250) ZAPM 28500 ÷ 1001

Engine prefix (250) M285M

Dimensions and mass

WEIGHTS AND DIMENSIONS

Specification Desc./Quantity

Kerb weight in running order 149 kg

Width (over mirrors) 837 mm

Length 2100 mm

Wheelbase 1455 mm

Saddle height 785 mm

Engine

ENGINE

Specification Desc./Quantity

Engine type Single-cylinder, four-stroke, four-valve, liquid-cooled.

Timing system Single overhead camshaft driven by chain on left side, three-

arm rockers with threaded adjuster.

Bore x stroke (125) 57 x 48,6 mm

Bore x stroke 72 x 60 mm

Cubic capacity (125) 124 cm³

Cubic capacity 244,290 cm3

Compression ratio (125) 12:1

Compression ratio (250) 10,5 - 11,5 : 1

Keihin Carburettor (125 - 250) CVEK-30

Walbro Carburettor (125) WVF 7G* Ø 29

Walbro Carburettor (250) WVF-7S*

Engine idle speed 1650 ± 50 rpm

CO adjustment 3,8 ± 07%

Air filter Sponge-type damped with a 50% Selenia Air Filter Oil - 50%

unleaded petrol mixture

Starter System Electric starter motor

Lubrication Enginelubricationwithlobepump(insidecrankcase)controlled

by a chain with double filter: mesh and paper.

Fuel supply with unleaded petrol; carburettor and vacuum pump.

Max. power (crankshaft) 125cc 11 kw (15 CV) at 9700 rpm

Max. power (crankshaft) 250cc 16,18 Kw (22CV) a 8250 g/min.

Top speed (125) 105 Km/h

Top speed (250) 124 Km/h

*The identification marking may change whenever the carburettor is updated

Characteristics B 125-250

CHAR - 8

Transmission

TRASMISSION

Specification Desc./Quantity

Transmission With automatic expandable pulley variator with torque server,

V belt, self-ventilating automatic centrifugal dry clutch, gear re-

ductionunitandtransmissionhousingwith forced aircirculation

cooling.

Capacities

CAPACITIES

Specification Desc./Quantity

Engine oil (125) ~ 1100 cc

Engine oil (250) ~ 1200 cc

Petrol tank approx. 10 l (including reserve approx. 2.5 l)

Rear hub oil 250 cc

Electrical system

ELECTRICAL COMPONENTS

Specification Desc./Quantity

Ignition type Electronic capacitive discharge ignition (CDI) and variable ad-

vance, with separate HV coil.

variable ignition advance (before T.D.C.) 125 10°±1° at 2000 rpm - 34°±1° at 6000 rpm

Ignition advance (before T.D.C) 10° ± 1 at 2000 rpm.

28° ± 1 at 6500 rpm.

Spark plug (125) NGK CR 8EB

Spark plug (250) CHAMPION RG4HC

Battery 12V-12Ah

Fuses N° 2 15A, N°1 10A, N° 2 7,5A, N° 3 4A

Generator alternating current

BV 125: spark-plug

We inform you that the spark-plug NGKCR8EB has been replaced by the CHAMPION RG4HC starting

with engine number M281M14016 , in order to improve the general performance of the engine. The

distance between the electrodes does not change and is still at 0,7 ÷ 0,8 mm.

Frame and suspensions

FRAME AND SUSPENSIONS

Specification Desc./Quantity

Type of chassis Welded tubular steel chassis with stamped sheet reinforce-

ments.

Front suspension Hydraulic telescopic fork with advanced wheel pin and Ø 35

mm stem

Front fork max. stroke 104 mm

Rear suspension Engine with swinging fork attached to frame by means of an

arm with 2 degrees of freedomPair of double-acting hydraulic

shock absorbers and coaxial springs with preloading adjust-

ment in four positions.

Rear shock absorber max. travel 95.5 mm

B 125-250 Characteristics

CHAR - 9

Brakes

BRAKES

Specification Desc./Quantity

Front brake Disc brake, diameter 260 mm and floating calliper with twin

plungers and hydraulic control (lever on the far right of the han-

dlebar)

Rear brake Disc brake, diameter 260 mm and calliper with two counteract-

ing plungers and hydraulic control (lever on the far left of the

handlebar)

Wheels and tyres

WHEELS AND TYRES

Specification Desc./Quantity

Front wheel rim Light alloy, 3.00 x 16"

Rear wheel rim Light alloy, 3.50 x 16"

Front tyre 110/70-16" M/C 52P Tubeless

Rear tyre 140/70-16" M/C 65P Tubeless

Front wheel tyre pressure (when cold) 2.1 bar

Rear wheel tyre pressure (when cold) 2.3 bar

Rear wheel tyre pressure (with driver and passenger) (when

cold) 2.5 bar

N.B.

CHECK AND ADJUST TYRE PRESSURE WITH TYRES AT AMBIENT TEMPERATURE. REGU-

LATE PRESSURE ACCORDING TO THE WEIGHT OF THE RIDER AND ACCESSORIES

Secondary air

The SAS for 125cc leader engines operates in a similar manner to the SAS for 2T engines.

The differences are the following:

insteadofenteringthroughthemufflerasfor2Tengine,thesecondaryairentersdirectlyinthedischarge

pipe on the head.

Characteristics B 125-250

CHAR - 10

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