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21 mm with 13 mm hex on handle
1 pc thread file -
Certified to prEN1621-3
25 / 10 x 1
The transversal tapers
Athena High Performance Racing Piston Stock Item:** FORGED PISTON DIA. 94.94mm YAMAHA 450 YZ F '03-'09 / WR F -SALE 21 mm with 13 mmAthena's traditional line of high performance racing pistons specifically designed for all off road bikes, has reached end of line. All of the "S4F" pistons have been reduced to clear. Produced with the latest technologies, to the industries tightest tolerances, they are made using aluminium alloys that have the perfect balance of nickel, copper, and silicon offering exceptional characteristics of lightness and endurance. The result is better engine
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