Polini XP4 STREET 50 Mode D'emploi page 18

6.9 HYDRAULIC BRAKES SYSTEM AND BRAKE PADS
This model is provided with a front and a rear hydraulic brake system.
When the brake pads wear, the brake fluid level goes down. Therefore,
periodically check the brake fluid level and the wear of the brake pads
WARNING. When you add brake fluid, make sure that the tank is
in horizontal position before removing the cap to avoid spilling the fluid.
WARNING. Incorrectly positioned brake lines can be damaged by
contact with moving parts, leading to serious accidents. The braking
system must also be run in before it achieves maximum efficiency.
Apply the brakes at least one hundred times before considering them to
be fully efficient. Proceed with great caution throughout this period.
At the end of this period, adjust the brakes and also check that all the
fixing bolts are tightened.
In order to adjust the travel of the rear brake pedal turn the pivot screw
placed on the brake pump and, once suited the stature of the rider, close
the nut placed on the pivot thread (photo 34).
Check the conditions of the pads friction material. When the thickness of
the material is inferior to 1 mm, change it. Be sure there is no oil leak.
Check if tubes and connections are worn or with cracks.
DANGER. Use only DOT 4 hydraulic brake fluid from clean new
containers.
WARNING. Brake fluid is highly corrosive to paintwork and can
cause injury if it comes into contact with the eyes or skin. Consult a
doctor immediately in case of accident. Change the brake fluid every two
years. DO NOT THROW SPENT BRAKE FLUID INTO THE ENVIRONMENT.
WARNING. As required by use and weather conditions, regularly clean
the brake callipers using a jet of compressed air. 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 discs are still hot.
DANGER. After changing the callipers press again and again the
brake level placed on the handlebar and the brake pedal in order to
make the pads closed to the disk. Before using the vehicle be sure the
brakes work perfectly.
6.10 TYRE PRESSURES
Check tyre pressure frequently and adjust if necessary. Always measure
tyre pressure when the tyres are cold.
FRONT
1,5 BAR - 21,8 PSI
6.11 TRANSMISSION CHAIN
The final drive chain is an extremely important component and deserves
special care and regular servicing.
DANGER. When working on the chain, take care not to jam your
fingers between the chain and the sprocket.
1- Check the chain tension with the motorcycle standing upright and with
no pressure on the suspensions. Measure chain movement at the
position shown in photo 35. Chain movement must be 35/39 mm.
REAR
1,8 BAR - 26,1 PSI
If necessary, proceed as follows to adjust the chain tension (photo 36).
- Loosen the nut "3" on the rear wheel spindle.
- Loosen the lock nuts "1" and turn the adjuster "2" anti-clockwise to
tighten or clockwise to slacken the chain. Make sure that the edges of
the spindle plates are perpendicular to the swing arm and measure
distance "A" between the swing arm and the plates.
- Tighten the rear spindle nut "3" (see schedule 8.1) (photo 37)
- Measure the chain movement again and repeat the adjustment
procedure if necessary.
- Gently turn the adjuster "2" to bring it into firm contact with the axle
plates. Hold the adjusters firmly with a spanner and tighten the lock
nut "1".
2- Whenever you check chain tension, also check the chain and the front
and rear sprockets for wear or damage.
3- Always lubricate the chain after washing the motorcycle. Dirty chains
can be cleaned with diesel fuel. A good quality chain lube spray
reduces chain wear and improves the efficiency of the transmission.
4- If you need to remove or change the chain, remember to replace the
clip on the split link with the closed end facing in the direction of
travel (photo 38).
DANGER. Never fit a new chain on worn sprockets or vice-versa.
Incorrect wheel alignment not only causes rapid chain and sprocket wear
but also affects the handling and control of the motorcycle.
DANGER. Loose, worn or badly aligned chains can break or come off
the sprockets. If this occurs the chain can jam the rear wheel and cause
accidents with serious personal injury and damage to the motorcycle.
6.12 ADJUSTING THE REAR SHOCK
The shock is set up in the factory with standard adjustment, but you can
anyway regulate the spring pre-load.
SERVICING:
1- Check the spring for damage or wear.
2- Bounce the rear of the motorcycle up and down and check that the
rear suspension functions smoothly.
3- Check that the shock rod is perfectly straight and that there are no oil
leaks around it.
4- Push the rear wheel sideways to check for play in the swinging arm
bushings. Replace the bushings immediately if any play is detected.
6.13 ADJUSTING THE FRONT FORK
The front fork is set up in the factory with standard adjustment.
SERVICING:
1- Check that the fork seals are clean and free from oil, dust and dirt.
2- Check the legs for oil leaks. Replace damaged fork seals before using
the motorcycle.
3- Before riding the vehicle, apply the front brake and bounce the front
of the motorcycle up and down to check that the front fork is
functioning smoothly.
6.14 FUEL
Only use car petrol with an octane rating of 96 to 100 or more.
In case of pre-ignition (knocking) try a different brand of fuel or a
higher octane rating. Fuel tank capacity is 3 litres (0,6 litres for the
emergency tank).
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ENGLISH