RUURUU Professional Crankshaft Sealing System
Direct replacement for STIHL 017, 018, 021, 023, 025, MS170, MS180, MS210, MS230, MS250, MS171, MS211 chainsaws. Compatible with OEM 96380031581 & 9638 003 1581. Engineered to prevent crankcase oil leaks in high-RPM operations (8000-12000 RPM)
⚙️ Precision Fit – 22mm ID (±0.01mm) matches MS170/MS180 crankshaft specs
🔧 Tool-Free Installation – Pre-lubricated edges fit Stihl MS250 clutch housing in 90 seconds
⛽ Ethanol Resistance – Triple-lip design reduces oil loss by 95% with E10 fuel blends
✅ RUURUU Validated – 1000hrs endurance testing
Package Contents: 4 x High-Performance Crankshaft Oil Seal