Gilera DNA 50, Workshop Manual

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Possible Cause Operation
Fluid leakage in hydraulic braking system Failing elastic fittings, plunger or brake pump seals, replace
Brakes overheating
OVERHEATING BRAKES
Possible Cause Operation
Brake disc slack or distorted Check the brake disc screws are locked; use a dial gauge and
a wheel mounted on the vehicle to measure the axial shift of
the disc.
Defective piston sliding Check calliper and replace any damaged part.
Electrical system
Battery
BATTERY
Possible Cause Operation
Battery The battery is the electrical device in the system that requires
the most frequent inspections and thorough maintenance. If the
vehicle is not used for some time (1 month or more) the battery
needs to be recharged periodically. The battery runs down
completely in the course of 5 ÷ 6 months. If the battery is fitted
on a motorcycle, be careful not to invert the connections, keep-
ing in mind that the black ground wire is connected to the
negative terminal while the red wire is connected to the terminal
. Follow the instructions in the ELECTRICAL SYSTEM
chapter for the recharging of the batteries.
Steering and suspensions
Rear wheel
POOR ROAD HOLDING
Possible Cause Operation
Faulty suspension Check that the rear shock absorber and/or the front fork is/are
in good working order. Replace or overhaul the front fork and/
or replace the rear shock absorbers in case of malfunction
Tyres deflated or damaged Check the correct pressure of the tyres and the condition of the
tread. Inflate to the correct pressure or replace.
Loosen the anchorage points of the front and/or rear suspen-
sion unit.
Check the tightness between the frame, swinging arm and en-
gine and the fixing of the wheels to the hub and/or the axle.
Check the correct tightening of the steering ring nut.
Heavy steering
STEERING HARDENING
Possible Cause Operation
Torque not conforming
Check the tightening of the top and bottom ring
nuts.
If irregularities continue in turning the steering
even after making the above adjustments, check
DNA 50
Troubleshooting
TROUBL - 39