SR-305 Big Bore Kit. Yamaha SR-250
*Item not depicted in picture Thanks to our friends at BP Racing you can take your Yamaha SR 250 to the next level. SR 305 Big BoreKit includes: -Used SR cylinder with 305 Big Boar sleeve. -Wiseco piston kit -Top end gasket kit * Contact us for details. Additional modifications to the crankcase may be needed.