GAS GAS MC Boy 50 User manual

MANUAL DEL USUARIO
USER MANUAL
MANUEL D’ENTRETIEN
LIBRETTO D’USO
BETRIEBSANLEITUNG

ENGLISH
USER MANUAL
USER MANUAL

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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

Specifications
EC Boy-50 MC Boy-50
49.38 / 5 49.38 / 12
1 (one)
39 x 41.8 mm
Air Liquid
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 CRMo, aluminium rear swingarm
Marzocchi hydraulic fork - 140 mm
Single-shock absorber Sachs - 155 mm 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 with retractable toecap
Dell'Orto 19 mm diameter carburettor with
polyurethane sponge filter diffuser
Dell'Orto 14 mm diameter carburettor with
polyurethane sponge filter diffuser
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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
Two-stroke single cylinder, layer admission directly to crankcase
2% mixture ratio
Forged aluminium
Quick guide to maintenance

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Fuel – Petrol/oil mixture
The motorcycle is fitted with a two-stroke internal
combustion engine. This type of engine requires a
mixture of petrol and oil.
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.
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.
I
7
1
B
A

Before starting the engine
- Open the fuel tap.
Note:
- If the engine is cold then pull the
choke upwards (A) and, then, rotate it 1/4of
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) 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.
C
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Reserve Open Closed
Fuel tap
This has three positions: open,
closed and reserve.
The diagrams below show the
position of tap (A) for each case.
8
C
A
A
2
8
3