Direct replacement crankshaft for Stihl chainsaws - Supported models: Stihl 020, Stihl 020T, Stihl MC200, Stihl MS200, and Stihl MS200T. This part is designed to fit and function with these exact models. - Exact part number: 1129 030 0400. Using the correct part number guarantees accurate replacement for the listed Stihl chainsaw models. - Function and purpose: Replaces a worn or failed crankshaft to restore proper engine operation, timing, and overall performance of the listed saws. - Compatibility and fit: Specifically matched to the crankshaft specifications of the Stihl models above, ensuring proper alignment with existing components during installation. - Reliability and maintenance: Provides a direct replacement option to support ongoing maintenance and rebuilds for compatible Stihl saws, helping reduce downtime. use scenarios - Scenario 1: Rebuilding a Stihl 020 or 020T that has a worn or failed crankshaft. Install this part to restore engine timing and smooth operation without broad model changes. - Scenario 2: Restoring a Stihl MC200 or MS200/MS200T during a routine service or overhaul. Use this crankshaft to bring the saw back to its original performance characteristics. - Scenario 3: Stocking for a service shop or maintenance program. Keep this exact part on hand to quickly replace a crankshaft in the listed models, minimizing tool down time and ensuring compatibility. Notes - Part number verification: 1129 030 0400 is the specified replacement for the listed Stihl models. Use this number to confirm compatibility before installation. - Installation guidance: As with any crankshaft replacement, refer to the appropriate service manual and follow proper mechanical procedures for disassembly, inspection, and reassembly.