Seller notes

Namura Top-End Repair Kit For YAMAHA YFM250 BIG BEAR 2007-2009 +1 Bore STD Comp Bore Size: 71.95mm Size Over Standard: +1mm Compression: 8.7:1 STD Comp Important: THE PISTON DOES NOT HAVE A MACHINED SMOOTH DOMEIncludes pistons, rings and top end gasket sets (and needle bearings when needed)Machined smooth piston crown (unless otherwise noted) to reflect combustion heat while reducing carbon buildupHard anodized piston crown with a hardness of HRB 105MOS2 coating to draw heat through piston walls...

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