Description
Overview:
This Genuine Stihl piston ring is a 54 mm (2.13 inches) diameter x 1.2 mm (0.05 inches) thickness component designed for the MS 660 and 066 professional chainsaws. Made from durable steel, it sits in the piston groove to create a tight seal against the cylinder wall, maintaining the compression needed for strong power delivery and reliable running. Correct compression also helps with dependable starting and consistent performance under load. As an OEM part, it is engineered to the exact dimensions and tolerances of the original equipment, ensuring straightforward fitting and long service life. If your saw shows signs of wear such as reduced power or difficult starting, renewing the ring with the correct OEM size is a standard part of a top-end refresh.
Key Features:
- Genuine Stihl OEM part for assured compatibility and reliability
- 54 mm (2.13 inches) diameter x 1.2 mm (0.05 inches) thickness for the correct groove and bore fit
- Precision-engineered to maintain airtight sealing and stable compression
- Durable steel construction suitable for high-temperature, two-stroke operation
- Helps restore power output and throttle response by reducing blow-by
- Supports efficient combustion for smoother running and reduced wear
- Consistent sizing for easy installation during routine top-end servicing
- Designed specifically for Stihl MS 660 and 066 platforms
Typical Applications:
Used during engine overhauls or maintenance when compression has dropped due to wear, scoring, or ring fatigue. Common for forestry and arborist work, milling, and firewood processing where the Stihl MS 660/066 operates under heavy loads and extended run times. Ideal when replacing a damaged ring or refreshing the top end.
Also known as:
Engine ring, cylinder ring, piston sealing ring. These terms refer to the same component that provides the sealing interface between the piston and cylinder to retain pressure within the combustion chamber.
Fits Models:
066, MS 660, MS660
Alternate Part Numbers:
1122-034-3001, 11220343001
