Large-bore cylinder and piston kit with 56 mm bore designed for MS660 and 066 chainsaws. Nikasil coating provides improved heat dissipation and reduced friction, delivering better performance and longer engine life compared with standard parts. High-quality materials and construction - Made from premium aluminum alloy with precision components - Offers exceptional durability and wear resistance - A reliable upgrade that withstands demanding cutting conditions Complete replacement set - Includes a full cylinder assembly with all necessary gaskets and components as shown - Provides everything needed for proper installation - No additional parts or accessories required Compatibility and versatility - Compatible with multiple models including 064, 066, MS640, MS650, and MS660 - A flexible replacement option for professional wood and forestry work Applications and use scenarios - Replacing a worn cylinder on MS660 or 066 during heavy-use jobs in logging, felling, or sustained cutting - Upgrading an older chainsaw to improve power and cooling in demanding cutting conditions - Fleet maintenance for professional forestry operations that service models 064, 066, MS640, MS650, and MS660, allowing a single replacement part to cover several units