# Piston

> The piston moves up and down in the cylinder and transfers combustion pressure to the crankshaft through the connecting rod.

- **Also known as:** Piston takımı, Piston kiti
- **Turkish term:** Piston
- **Category:** [Pistons & Rings](https://motorsikletparcasi.com/en/category/pistons-and-rings)
- **Page:** https://motorsikletparcasi.com/en/glossary/piston

Pistons are made of lightweight aluminium alloy and work with the [piston rings](https://motorsikletparcasi.com/en/glossary/piston-ring), gudgeon pin and pin clips. When a cylinder is worn and honed or rebored, oversize pistons and rings are used.

## Common failures

- **Scuffing (seizure):** lack of oil or overheating
- **Holed crown:** lean mixture, wrong spark plug or detonation
- **Pin play:** a knocking noise that is worse when cold

When choosing a piston, the bore, pin diameter and compression height must match the engine.

## Related terms

- [Piston ring](https://motorsikletparcasi.com/en/glossary/piston-ring): Piston rings sit in grooves on the piston; they seal combustion pressure, scrape oil off the cylinder wall and carry heat to the cylinder.
- [Cylinder](https://motorsikletparcasi.com/en/glossary/cylinder): The cylinder is the part of the engine in which the piston moves and combustion takes place.
- [Connecting rod](https://motorsikletparcasi.com/en/glossary/connecting-rod): The connecting rod links the piston to the crankshaft and transfers the piston's linear motion into crank rotation.
- [Engine displacement (cc)](https://motorsikletparcasi.com/en/glossary/engine-displacement): Engine displacement is the total volume swept by the pistons from bottom to top dead centre, expressed in cubic centimetres (cc).

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- Source page: https://motorsikletparcasi.com/en/glossary/piston
- Last updated: 2026-10-09
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