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TPR Racing 63mm Big Bore Kit that will increase the displacement of a Gy6 to 180cc! *You will need to modify your engine case to accommodate the larger cylinder.NOTICE: This...

TPR Racing 61mm Big Bore Kit that will increase the displacement of a Honda PCX 125 to 169cc!NOTICE: This product is NOT legal for sale, installation, or use on a...

TPR 63mm Honda Grom 125 Replacement Gasket Set for 180cc Big Bore TPR 63mm Honda Grom 125 Replacement Gasket Set for 180cc Big Bore   Includes head gasket and 2...