Original STIHL chain sprocket cover (part number 1122 640 1707) designed for MS 640, MS 650, and MS 660 chainsaws.
Provides durable clutch-side protection, precise chain alignment, and long-lasting performance.
 
✅ Authentic OEM Part – Built to STIHL factory standards for guaranteed compatibility and durability.
✅ Wide Compatibility – Fits STIHL 064, 066, MS 640, MS 650, and MS 660 models.
✅ Robust Protection – Shields the sprocket, clutch, and chain drive area from debris and wear.
✅ Premium Polymer Construction – Made of impact-resistant materials for heavy-duty professional use.
✅ Accurate Alignment – Ensures proper bar and chain positioning for smooth and efficient operation.
✅ Easy Installation – Quick OEM replacement using original mounting hardware.
✅ Maintenance Essential – Ideal replacement for cracked, worn, or damaged covers to restore peak performance.