Seller notes

172cc BIG BORE KIT FOR CHINESE SCOOTERS 61mm BORE 54mm SPACING (A-BLOCK) PISTON DIAMETER: 61mmPISTON PIN DIAMETER: 15mmPISTON PIN LENGTH: 42.5mmOVERALL HEIGHT: 60mmINTAKE PORT DIAMETER: 24mmEXHAUST PORT DIAMETER: 24mm *WILL REQUIRE BORING THE BLOCK ON MOST MODELS* YOU NEED 64.5mm ID INSIDE THE CRANKCASEIF YOU DON'T HAVE THAT MUCH CLEARANCE SEE EBAY ITEM NUMBER 173149321043ONLY NEED 63mm *YOU WILL NEED TO RE-JET YOUR OLD CARBURETOR* *WE SUGEST GETTING A LARGER 26mm or 30mm CVK CARBURETOR*WITH ACC...

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