58.5mm (155cc) BIG BORE KIT FOR SCOOTER ATV KART WITH 150cc GY6 MOTORS TYPE #3 A

GY6 STORE 155cc BIG BORE KIT FOR CHINESE SCOOTERS 58.5mm BORE (NO BORING REQUIRED) TAKE YOUR STOCK 150cc GY6 MOTOR TO THE NEXT LEVEL  WITH THIS NO BORING REQUIRED DROP IN KIT.  WITH THIS KIT YOU WILL TAKE YOU ENGINE TO A 155cc BEAST SET CONTAINS CYLINDER HEAD 54mm SPACING (A-BLOCK) CYLINDER 58.5mm BORE WITH WAVED FINS (BETTER AIR FLOW) PISTON & RINGS SET PREFORMANCE CAMSHAFT ROCKER ARM SET 54mm SPACING (A-BLOCK) VALVE COVER W/GASKET TOP AND BOTTOM GASKET SET *IF YOU HAVE ANY QUESTIONS PLEASE CONTACT US* WILL NOT FIT GY6 K-BLOCK  MOTORS OR  GY6 57mm SPACING (B-BLOCK) MOTORS  *NO BORING REQUIRED* *FOR STOCK GY6 BLOCK WITH 54mm SPACING ONLY* OUTER CYLINDER DIAMETER 60.4mm MOST KITS ARE 65mm  CYLINDER BORE 58.5mm CYLINDER HEIGHT 68.60mm