180cc 63mm *54mm SPACING* BIG BORE KIT FOR SCOOTER ATV UTV WITH 150cc GY6 MOTORS

180cc BIG BORE KIT FOR CHINESE SCOOTERS 63mm BORE *54mm SPACING* (A-BLOCK) WILL REQUIRE BORING THE BLOCK ON MOST MODELS  FITS MOST CHINESE SCOOTERS WITH 150cc GY6 MOTORS SET CONTAINS CYLINDER HEAD  63mm BORE CYLINDER  KBF PISTON & RINGS SET HIGH PREFORMANCE CAMSHAFT ROCKER ARM SET VALVE COVER WITH GASKET TOP & BOTTOM GASKETS CYLINDER OD = 65mm / ID 63mm  CYLINDER HEIGHT 68.9mm *YOU WILL NEED TO RE-JET YOUR OLD CARBURETOR* *WE SUGEST GETTING A LARGER  26mm or 30mm CVK CARBURETOR* WITH ACCELERATOR PUMP AND RE-JET TO SUIT