Motorcycle piston

Motorcycle engine pistons are an important part of the engine rotating assembly. Driven by the pressure created in the combustion chambers, these elements move back-and-forth. The motion is transferred to the connecting rods which make the crankshaft rotate.

Types of motorcycle engine pistons

By production method:

• Cast. These are the most common ones and are used in mass-production engines. This type of pistons is suitable for bikes which are exposed to moderate loads.
• Forged. They are characterised by durability and reliability. These are fitted onto sports engines which are characterised by high power output and are used under high loads.

Malfunctions: their causes and symptoms

• Scratched surfaces. They can manifest themselves in high motor oil consumption. As a rule, this malfunction is accompanied by smoke going out of the air breather. Scratches might appear due to abrasive particles contained in the contaminated lubricant.
• Destruction. If this happens, a knocking sound can be heard right after the engine was started. A broken crankshaft or connecting rod can lead to piston destruction. In that case, the broken off fragments constantly affect the piston.
• Piston seizure. The signs are a knocking sound that grows louder and bad engine thrust. A possible cause is failure to observe the vehicle manufacturer’s recommendations concerning the adjustment of the ignition system parameters and the choice of spark plugs.

Tips on how to maintain and replace motorcycle engine pistons

• There are no definite replacement intervals. Replace the component when it is necessary.
• Destruction and seizure might lead to a sudden stop of the motorcycle while travelling and, as a result, to an accident. Do not ignore the symptoms of breakdown.
• If you have no skills of servicing the engine, it is better to entrust replacement of the parts to the professionals of a repair shop. Besides, this operation requires special equipment.

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