Description
Overview:
The Villiers MK15 MK20 Piston Assembly 030 Oversize is a genuine replacement piston set for small petrol engines used in vintage plant and garden machinery. Made with a durable aluminium alloy piston and supplied with steel piston rings and a hardened steel gudgeon pin, it restores compression and smooth running in tired engines. Designed for cylinders that have been rebored to +0.030 inch oversize (approximately +0.76 mm), it provides a precise fit in Villiers MK15 and MK20 engines. This unused old-stock component is suitable for restorations and routine overhauls where the original piston has worn or scuffed. It helps maintain reliable starting, stable idle, and consistent power delivery while preserving the authenticity of classic equipment built around Villiers engines.
Key Features:
- Genuine Villiers part for accurate fit and dependable performance
- +0.030 inch (+0.76 mm) oversize for use after cylinder rebore/hone
- Complete assembly with piston, piston rings, and gudgeon pin for straightforward replacement
- Aluminium alloy piston for strength with low reciprocating mass
- Steel rings designed to restore compression and control oil
- Hardened steel gudgeon pin for long service life under load
- Suitable for engine rebuilds where original bore wear is beyond standard size
- Helps reduce blow-by, improve starting, and stabilise running
- Unused old stock; may show minor storage tarnish without affecting function
Typical Applications:
Used in the overhaul of classic Villiers-powered equipment such as compact construction plant, pumps, generators, cement mixers, cultivators, and other stationary or portable machinery. Ideal when reboring a worn cylinder to +0.030 inch (+0.76 mm) and fitting a matched oversize piston to restore engine performance and longevity.
Also known as:
Piston kit, 30 thou oversize piston, engine piston assembly, piston and rings set, oversize piston set, replacement piston for rebored cylinder, piston with gudgeon pin, cylinder oversize repair piston.
Fits Models:
MK15, MK20
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