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The superiority of EFi system are listed below.

1. Apparent cold start up improvement. (compare with carburetor models)
2. Lower emission.
3. Low fuel comsumption and hign effieciency.

The acceleration may not be smooth due to cold started engine.

Especially the carburetor models. The driver should warm up the engine for 2-3 minutes after engine started if possible, to protect the engine.

If in rush, try not to apply large throttle suddenly if the bike just been started.

The cooling liquid should be exchanged each year or every 10,000km.

1. Blue Smoke: Abnormal engine oil cousumption, the bike should return to service center as soon as possible.
2. Black smoke: The fuel haven't been fully combusted, or false fuel / air mixture ratio.
3. If 2-stroke engine model been parked or driven under low speed for long time, the engine oil might accumulate largely in the exhaust pipe, causing vast white smoke. The solution is to ride at high speed for certain distance, or apply large throttle for a while, to burn out the accumulated engine oil and stop white smoke from emission.

The driver can test the battery condition through methods listed below.

1. Encounter difficulties to start, or unable to start the engine.
2. Horn disabled.
3. Abnormal operations of turn signal lights.
4. Insufficient head lamp light. (DC lighting models).

The Coating Cylinder is to electroplate a layer of specialized coating material at the surface of combustion chamber, which holds the advantage of hardness and better heat evaporation efficiency, thus performs better resistance to friction ,and requires no more boring process. The advantage of Coating Cylinder are listed below:

1. lighter weight. 10%~25% ligher than conventional cylinder.
2. Better high temperature resistance, under fully lubrication, the Coating Cylinder can sustain the temperature over 1500 Celsius.
3. High friction resistance, the hardness is 2~3 times harder than conventional cylinder.
4. High heat evaporation efficiency, the combustion heat can travel to the cooling fin quickly.

The compression ratio of an internal combustion engine is the cylinder volume ratio between top dead center and bottom dead center (TDC & BDC). compression ratio = ( displacement + combustion chamber volume ) / combustion chamber volume.

The engine oil is the key material to lubricate the engine system, its crucial to use and exchange it periodically. The owner should use the specified type of oil regulated by the manufacturer, to fit the requirement of product warranty criteria. The frequency to check and exchange engine oil depends on descriptions shown on the owner's manual. But, its for sure that to perform checks and maintenance periodically would improve the product's performance and life.

The motorcycle engine used to be single cylinder-twin valve design. SYM unveiled its first single cylinder, 4-valve design engine in May, 1999. The main advantage of such new design is to increase the engine performance and efficiency during mid to high speed, make the performance far more superior then conventional twin valve design, especially acceleration, top speed and fuel efficiency aspects.

Not actually, possible causes are listed below.

1. Insufficient power supply.
2. The connection coupler had fallen off from the wiring joint, causing open circuit.
3. Fuse burned.
4. Faulty starter relay.
5. Faulty starter motor.
6. Faulty start clutch. If the machine failed to start electrically, please contact professional technician for repairment.