GasGas MC EC Boy50 2005 Owner's manual

MANUAL DEL USUARIO

MANUAL DEL USUARIO

SERVICE MANUAL

SERVICE MANUAL

MANUEL D’ENTRETIEN

MANUEL D’ENTRETIEN

LIBRETTO D’USO

LIBRETTO D’USO

USER MANUAL

USER MANUAL

ENGLISH

ACKNOWLEDGEMENTS TO THE PURCHASER

GAS GAS thanks you for the trust you have placed in us.

We are delighted that you have selected the MC Boy 50 / EC Boy 50 motorcycle and we would
like to welcome you to the GAS GAS family.

Get to know your new machine well. This bike incorporates our accumulated competition experience
and that which we have gained from the achievement of many important titles.
You now possess a motorcycle with which, as well as feeling comfortable, you are offered the
infinite possibilities of driving at the highest level of your skill while maintaining a maximum of
security.

This manual provides you with a good basic knowledge of the features and machine handling. It
also contains many important instructions regarding safety and provides information about the
basic maintenance and inspection procedures.

Thank you for your trust in us, and welcome to GAS GAS motorbikes.

GAS GAS MOTOS, S.A.

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Important warning

Read this Manual carefully. It contains all the necessary information for your safety, and that of
others, as well as guaranteeing the correct conservation and maintenance of the GAS GAS
motorcycle you have just acquired.

All of the necessary instructions for the correct driving and handling of this vehicle are set out
below. Each message is preceded by a symbol whose meaning is as follows:

Caution! This symbol indicates all of the rules and precautionary measures that must be
taken in order to avoid any physical injury, serious or slight, including death of the user;
to ignore these represents a serious danger.

Warning! This symbol introduces special warnings to avoid damage to your motorcycle.
Should these warnings be ignored, the guarantee may be automatically invalidated.

Miscellaneous notes. These are instructions necessary for optimum use of control and
adjustment operations, as well as conservation and maintenance work on the motorcycle,
so that you may benefit from a maximum of driving satisfaction.

The aim of this Manual is to help the user minimise or avoid possible damage to people,
property, the environment, and naturally to your new motorbike. Therefore, all the information
presented here is based on data obtained from the latest models put on the market just before
publication. However, GAS GAS Motos, S.A. reserves the right to make modifications without any
prior warning to consumers and without incurring any additional obligations in so doing. Your local
dealer will also provide you with any information as might be deemed necessary.

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Index

Acknowledgements to the purchaser 3
Important warning 4
Index 5
Quick Guide to Maintenance 6
Fuel - Petrol/oil mixture 7
Fuel tank 7
Fuel tap 8
Before starting the engine 8
Starting the engine 9
Stopping the engine 9
Riding the motorcycle 10
Stopping the motorcycle 10
Running-in period 11
Transmission oil - Checking the level 11

-Filling 12

-Changing 12
MC Boy 50 cooling system - Checking/filling 13
EC Boy 50 cooling system - Checking 13

Carburettor - Adjusting throttle cable 14

- Adjusting idle speed 14
Spark plugs - Inspecting 15
Air Filter - Cleaning 15
Front brake fluid - Checking 16
Rear brake fluid - Checking 16
Front brake lever - Adjusting 16
Rear wheel - Centre alignment 17
Chain slack - Checking 17
Master link - Checking 17
Tyre pressures - Checking 18
Brake pads - Checking 18
Brake circuit - Bleeding 19
Front fork - Oil level 19
Lubrication 20
Identification 21
Guarantee manual 22

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Quick guide to maintenance

Description

Displacement / power cc/CV
Type
Number of cylinders
Bore and stroke
Cooling system
Engine lubrication system
Engine supply system

Ignition system
Clutch
Gear changes
Transmission

Transmission lubrication system

Type
Front suspension
Rear suspension
Front brake
Rear brake
Wheels
Tyres

- Front

- Rear
Kick-start pedal
Shift pedal and rear brake

ENGINE

Specifications

EC Boy-50 MC Boy-50

49.38/5 49.38/12

Two-stroke single cylinder, layer admission directly to crankcase

1 (one)

39 x 41.8 mm

Air Liquid

2% mixture ratio

Dell'Orto 14 mm diameter carburettor with
polyurethane sponge filter diffuser

Dell'Orto 19 mm diameter carburettor with
polyurethane sponge filter diffuser

Electronic with variable advance

Automatic

Single gear

Primary by gears,

secondary by chain

250 cc of SAE 20 oil

CHASSIS

Deltabox, elliptic profile tubes in Chromoly, aluminium rear suspension arm
Marzzochi - 140mm stroke hydraulic fork
Single-shock absorber Sachs - 155mm stroke
Disk, 160 mm diameter, AJP calliper
Disk, 150 mm diameter, AJP calliper
Duralumin wheels

2,5 - 14" 2,5 - 10"

2,75/3,00 - 12 2,75 - 10"

Forged aluminium

Forged aluminium with retractable toecap

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Fuel – Petrol/oil mixture

1

I

To ensure the correct working of the engine, the following are recommended:

- Use high quality petrol, with an octane rating equal to or above 90
(RON +MON)/2 or 98 (RON).

- Use 2T synthetic oil.

Warning:

- If the recommended oil is not available, use semi-synthetic oil.

- Do not mix different oil-types.
Mixture ratio: oil, 2% of petrol volume (50 parts petrol to every 1 part oil).
Note: we recommend first preparing the mixture in a suitable container
and then filling the fuel tank.

The motorcycle is fitted with a two-stroke internal combustion
engine. This type of engine requires a mixture of petrol and
oil.

7

Fuel tank

This has a rapid access cap (A) and a vent hose (B) to allow gases
produced in the tank to escape.

- To open the cap, lift the clip in the direction shown by the arrow and turn
to the left.
Warning: Regularly check the cap seal and vent hose to ensure they are
leak proof. Risk of spillage.

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B

A

2

C

it 1/4 of a turn to the left or the right to secure
it in place. Once the engine is turning over
regularly at idle speed, return the choke (A)

A

to the rest position.

- Do not use the choke on hot days or when
the engine is hot.
In this case, hold the throttle lever partially
open until the engine starts.

Before starting the engine

- Open the fuel tap.

- If the engine is cold then pull the
choke upwards (A) and, then, rotate

8

8

Fuel tap

This has three positions: open,

C

position of tap (A) for each case.

closed and reserve.
The diagrams below show the

Reserve

Open

Closed

3

A

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