Benelli TNT125 Service Manual


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;

Valve is not installed properly (valve is bent or
worn or there is carbon deposition at valve seat).
There is a “click” to give an alarm for fault:
 There is carbon deposition in combustion
chamber;
 Fuel quality is poor or fuel type is not applicable;
 Spark plug is not applicable;
 Engine control unit (ECU) fails.
Others:
 Throttle cannot be fully opened;
 Brake dragging;
 Clutch is slipping;
 Engine is overheated;
 Oil level is too high;
 Oil viscosity is too high;
 Drive system fault;
 Camshaft and cam is worn;
 Suction valve fault;
 Secondary air compensating valve fault;
 Catalytic agent melting caused due to the
overheating of muffler.
Temperature is too high:
Ignition is abnormal:
 Spark plug is dirty, damaged or abnormal;
 Spark plug does not apply;

Engine control unit (ECU) fails.
Muffler is overheated:
 For Benelli emission pollution control systems,
even if the cylinder is not ignited or the running is
abnormal, do not start the engine (go the nearest
repair point for maintenance);
 For the Benelli emission pollution control system,
if the battery power runs out, do not start the
motorcycle (connect another fully charged battery
using jumper, and then electrically start the
engine);
 For Benelli emission pollution control systems, if
ignition is abnormal because of very dirty spark
plug or poor contact of high pressure package,
please do not start the engine;
 For the Benelli emission pollution control system,
when the main switch is rotated to “Off”, do not
ride a motorcycle and slide using inertia (rotate the
main switch to “On”, and start engine);

Engine control unit (ECU) fails.
There is problem with fuel / air mixture:
 Throttle body assembly fixer is loosened;
 Ventilation pipe fixer is loosened;
 Sealing of air filter is poor or there is no air filter;
 Air filter is blocked.
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Benelli TNT125 Specifications

General

Displacement	125 cc
Transmission	5-speed
Fuel System	EFI
Fuel Capacity	7.2 liters
Seat Height	780 mm
Dry Weight	116 kg
Bore x Stroke	54 mm x 54.5 mm
Starting System	Electric
Wheelbase	1215 mm
Engine Type	Single cylinder, 4-stroke, air-cooled
Front Suspension	Upside-down fork
Front Brake	Single disc
Rear Brake	Single disc
Front Tire	120/70-12
Rear Tire	130/70-12
Max Power	8.2 kW (11.1 Cv) @ 9500 rpm
Rear Suspension	Swing arm with lateral shock absorber with adjustable spring preload