4138 640 1704 STIHL Chain Sprocket Cover – Genuine OEM Replacement 992521 Belt Section: HB

Belt Section: HB

Construction: OEM-grade metal for durability and corrosion resistance

Component Type: Rewind starter / recoil starter

engineered to maintain proper compression and sealing within the engine cylinder of compatible STIHL chainsaws

4138 640 1704 STIHL Chain Sprocket Cover – Genuine OEM Replacement 992521 Belt Section: HB4138 640 1704 STIHL Chain Sprocket Cover Genuine OEM Replacement The STIHL Chain Sprocket Cover (4138 640 1704) is a genuine OEM replacement cover designed for use on select STIHL HT series pole pruners. This cover protects the chain sprocket and associated drive components from debris, impacts, and wear, ensuring smooth operation and long service life. Manufactured to STIHLs exact factory specifications, this OEM chain sprocket cover provides correct