Polini MINIBIKE Manual De Uso Y Mantenimiento página 15

cable (photo no. 13). Screw the central screw using the supplied
washer and make attention that the handle doesn't hang down
but it arrives at end stroke, otherwise repeat this operation and
charge the spring more.
7.4 CHECKING THE COOLANT LEVEL
DANGER. Only check the coolant level with the engine cold,
in order to avoid possible burns when removing the expansion
tank cap.
When the engine is cold, unscrew the expansion tank cap and
check the level of the coolant inside. Top up as necessary. See
section 3, engine starting. Screw down the expansion tank cap
tightly.
7.5 CHANGING THE COOLANT
Stand the motorcycle upright and use a flat-nose pliers to
remove the clamp. Collect the water in a suitable recipient.
Make sure that the entire cooling system is in perfect condition,
and then fill with DISTILLED WATER by following the instructions
provided (See section 3, engine starting).
WARNING! Never leave the motorcycle out of use with its
cooling circuit filled for too long, and drain the fluid whenever a
prolonged period of inactivity is foreseen.
7.6 ADJUSTING ENGINE IDLING SPEED
Warm up the engine before adjusting the idling speed. Leave the
engine idle with the throttle closed. Turn the idle speed
adjustment screw on the right hand side of the carburettor in or
out to achieve the lowest engine speed possible without running
becoming irregular (for some minutes).
DANGER. The rear wheel will spin if it is not in contact with
the ground or locked by the brake. Accidental contact with a
spinning wheel or tyre can cause serious personal injuries.
7.7 ADJUSTING THE THROTTLE CONTROL AND CABLE
Make sure that the accelerator grip operates smoothly and that
the play in the throttle cable measures 3-5 mm. If play exceeds
this measurement, reduce play by screwing out the adjuster on
the top of the carburettor (photo 14) or on the throttle grip.
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WARNING! Do not make repairs whenever necessary can
lead to serious personal accidents and serious damage to the
motorcycle.
7.8 ADJUSTING THE BRAKES
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Proceed as follows to adjust brake lever position:
1- Remove the brake control protection cover.
2- Release the ring nut screwed in on the brake lever and screw
down the cable adjuster clockwise to decrease the play in the
brake lever or counter-clockwise to increase play.
3- After completing the operation, insert the protection cover
again on the cable-tightener washer.
NOTE. The lever is usually left a stroke of 5-10 mm measured
from its end. Adjust by working on the brake callipers: unscrew
nut 1 and screw in dowel 2 until the correct stroke of the handle
lever has been restored. While keeping dowel 2 in position,
tighten nut 1 again and make sure that the wheel does not
remain braked (see drawing 1).
As required by use and weather conditions, regularly clean the
brake callipers using a spray of compressed air (see Paragraph
8.2) and check the conditions of the pads friction material.
When the thickness of the material is inferior to 1 mm, change it.
WARNING! Do not adjust the brakes when the discs are hot.
7.9 REPLACING THE BRAKE PADS
Remove the calliper fixing bolts and remove the brake calliper.
Remove the brake pads fixing screws. Use a small flat blade
screwdriver to gently prize out the worn pads. Fit the new pads,
making quite sure to align the brake pads hole with the hole for
the screws and reassemble the screws. Reassemble the caliper
unit on the fork or the frame and perform braking operations.
Lubricate the internal caliper mechanisms and fixing bolts with
grease during these operations.
WARNING! Be careful not to dirty the pads with the oil.
WARNING! Do not adjust the brake when discs are still hot
7.10 TYRE PRESSURES
Correct tyre pressure ensures maximum stability and control and
also extends tyre life. Check tyre pressure frequently and adjust as
necessary. Always measure tyre pressure when the tyres are cold.
3/5 mm.
DRAWING 1
ENGLISH
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