# Cylinder

> The cylinder is the part of the engine in which the piston moves and combustion takes place.

- **Also known as:** Silindir takımı, Silindir grubu, Cylinder kit, Big bore
- **Turkish term:** Silindir
- **Category:** [Cylinder Kits](https://motorsikletparcasi.com/en/category/cylinder-kits)
- **Page:** https://motorsikletparcasi.com/en/glossary/cylinder

On small motorcycles and scooters the cylinder is usually a separate casting that sits on the crankcase. As a spare part it is mostly sold as a **cylinder kit**: cylinder, [piston](https://motorsikletparcasi.com/en/glossary/piston), [rings](https://motorsikletparcasi.com/en/glossary/piston-ring), gudgeon pin and gaskets.

- Vertical scoring and ovality in the bore cause compression loss and oil burning.
- Light wear can be honed out; heavier wear needs a rebore and an oversize piston.
- "Big bore" performance kits increase engine capacity and need care regarding registration and roadworthiness rules.

## Related terms

- [Piston](https://motorsikletparcasi.com/en/glossary/piston): The piston moves up and down in the cylinder and transfers combustion pressure to the crankshaft through the connecting rod.
- [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 head](https://motorsikletparcasi.com/en/glossary/cylinder-head): The cylinder head closes the top of the combustion chamber and carries the valves, camshaft and spark plug.
- [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/cylinder
- Last updated: 2026-10-09
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