Benelli TNT125 - The Handlebar Shakes or Vibrates Severely; Handlebar Is Swinging to One Side; Shock Absorption Effect Is Not Ideal; Brake Cannot Work

 Wiring method of wire is incorrect;
 Steering column nut is too tight;
 Steering column bearing is broken;
 Lubricating oil in steering column bearing is
insufficient;
 Steering column is bent;

Tire pressure is too low.
The handlebar shakes or vibrates severely:
 Tire is worn;
 Swing arm main shaft bearing is worn;
 Rim deformation or imbalance;
 Wheel bearing is worn;
 Handlebar fixer bolt is loosened;
 Steering column nut is loosened;
 The run-out of front shaft and rear shaft is too
large;
 Engine mounting bolt is loosened;
Handlebar is swinging to one side:
 Frame is bent;
 The wheels are misaligned;
 The arm is bent or twisted;
 The oscillation of main shaft of swing arm is too
large;
 Steering column adjustment error;
 Front fork is bent;
 Left and right front shock absorption oil level is
uneven.
Shock absorption effect is not ideal:
(too hard)
 Excessive front shock absorption oil;
 The viscosity of front shock absorption oil is too
high;
 Rear shock absorber is too hard
 Tire pressure is too high;
 Front fork is bent;
(Too soft)
 Tire pressure is too low;
 Front shock absorption oil is insufficient and / or
leaks;
 The viscosity of front shock absorption oil is too
low;
 Rear shock absorber is too soft
 The elasticity of front fork and rear shock absorber
springs are too poor;

Rear shock absorber leaks.
Brake cannot work
 There is air in the brake pipe;
 Friction plate or brake disc is worn;
 Brake fluid leaks;
 Brake disc is deformed;
 Friction plate is contaminated;
 Brake fluid deterioration;
 The main reservoir and secondary reservoir in the
master cylinder are damaged;
 The inner wall of master cylinder is damaged.
Battery fault:
Battery power runs out:
 Not enough power;
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