There's no replacement for displacement! Pro-Tec's 727cc and 686cc Rhino big bore kits will provide the low RPM torque for racers who crave the holeshot and recreational users who want to be the king of the hill.
LA Sleeve 727cc big bore centrifugally spun, centerless ground, chrome-moly cylinder sleeve Yamaha Rhino 660 (all years).
Required for use with 105mm 727cc piston kit. Installs into stock Rhino 660 cylinder block.
*The 686cc big bore kit includes a lightweight forged aluminum 102mm piston kit that bores into your stock cylinder.