Gates G-Force Drive Belt 40G4340 Yamaha FX Nytro XTX 2009 2010 2011 Replaces OEM part number: 8GK-17641-10-00 Size: 1.375 X 44.625 Outside Circumference (in): 44.625. Outside Circumference (mm): 1133. Top Width (in): 1.375. Top Width (mm): 35 Gates G-Force Belts are the First of a New Generation of Continuously Variable Transmission (CVT) Belts Identical to OEM, G-Force belts are constructed with double or single cog designs to match the OEM belt