Benelli TNT125 - There Is Problem with Fuel; Air Mixture; Cylinder Pressure Is too Low; The Running Is Abnormal During Low-Speed Driving; Spark Is Weak

 High-voltage package fault;
 Engine control unit (ECU) fails;
 Camshaft position sensor fault;
 Gear switch, starting lock switch or single switch
fault;
 Crankshaft sensor fault;
 Short circuit of main switch or engine flameout
switch;
 Short circuit or open circuit of starting system;
 Main fuse or main switch fuse blows out.
There is problem with fuel / air mixture:
 Bypass screw and / or idling adjustment screw is
abnormal;
 Airway is blocked;
 Air filter is blocked, sealing is poor or missing;
 Oil filling port cover, crankcase ventilation pipe or
air filter drain pipe leaks;
Cylinder pressure is too low:
 Spark plug is loosened;
 Cylinder head is not tight;
 Cylinder and piston is worn;
 Piston rings are damaged (worn, weak, damaged
or stuck);
 The gap between the piston ring and the piston
ring groove is too large;
 Cylinder head gasket is damaged;
 Cylinder head is deformed;
 Valve spring is damage or the elasticity is poor;
 There is no valve clearance;
 Valve is not installed properly (valve is bent or
worn or there is carbon deposition at valve seat).
The running is abnormal during low-speed driving:
Spark is weak:
 Battery voltage is low;
 Anti-theft control system fault;
 High-voltage package fault;
 Short circuit or poor contact of high voltage
package;
 Spark plug is dirty, damaged or clearance is
abnormal;
 Spark plug is not applicable;
 Engine control unit (ECU) fails;
 Camshaft position sensor fault;
 Crankshaft sensor fault.
There is problem with fuel / air mixture:
 Bypass screw is abnormal;
 Airway is blocked;
 Exhaust pipe and exhaust vent is blocked;
 Idle air channel is blocked;
 Air filter is blocked, leaky or not installed;
 Fuel tank vent is blocked;
 Fuel pump fails;
 Throttle body assembly fixer is loosened;

Vent pipe fixer is loosened.
Cylinder pressure is too low:
 Spark plug is loosened;
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