PROX Crankshaft Oil Seal 27.8 x 55 x 10 mm (Manufacturer part number: 41.2-28004) — single oil seal designed for the sealing of the crankshaft on motocross machines. PROX replacement part, intended for engine interventions where oil/case sealing is essential to prevent leaks and maintain the cleanliness of the bottom end.

• Type: Crankshaft oil seal (single)
• Dimensions: 27.8 x 55 x 10 mm
• Brand: PROX
• Reference: 41.2-28004
• Category: Motocross

This radial seal is designed to replace the worn sealing element at the engine case. Its compact design matches the specified dimensions for a precise fit around the crankshaft. Sold individually, it is used during preventive replacement or after engine disassembly to minimize the risk of oil leaks and contamination of the lubrication system.

Known compatibilities: YAMAHA YZ 250 (CG23) 2021, YAMAHA YZ 250 X 2020, YAMAHA YZ 250 (CG20) 2005 — check the part number and dimensions before installation to ensure compatibility with your machine. A must-have in the maintenance kit for engine restoration operations on motocross bikes.