Base Gasket

This high-quality base gasket (SKU: ST0663) is a direct replacement for STIHL 066 and MS660 chainsaws. Designed to create a reliable seal between the cylinder and crankcase, it ensures optimal compression and prevents air leaks for consistent engine performance. Manufactured to OEM specifications (STIHL 1122 029 2301), this durable gasket is essential for a proper rebuild or top-end service.

• Precision-cut to match OEM fitment for a perfect seal.
• Constructed from fuel- and heat-resistant material for long-lasting durability.
• Simple to install during cylinder replacement or engine overhaul.

• STIHL 066
• STIHL MS660

Chainsaw Gaskets & Seals – Essential replacement parts for maintaining engine compression and preventing air leaks in professional-grade chainsaws.