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1974-1977 Yamaha YZ250
maintaining the coolest temperature possible during aggressive use
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Vertex 23879A Cast Replica Stroker Piston Kit (112cc) - Standard Bore 51.95mm control-steering-stem-nuts 1974-1977 Yamaha YZ250Bore: 51. 95mm Sizing: Standard Bore Exact fit A, B, or C pistons match your cylinder bore perfectly to maximize power and performance while reducing blow by and oil consumption. 2 stroke pistons have an 18% silicon content which decreases wear and thermal expansion, allowing for tighter running tolerances for more power, less noise, and longer lifespan. High tech Molybdenum Disulphide (MOS2) skirt coating for reduced wear and improved break in. 4
