Motorcycle Engine Cylinder Kit With Piston Pin Gaskets 57mm Bore Fit For Benelli TNT150 Carburetor wide compatibility with Benelli TNT150 TNT15 carburetor engine; standard 57mm bore size engine assembly parameters direct bolt on replacement; consistent mounting hole spacing outlet size as cylinder; no extra or required during installation machined cylinder inner wall paired with matched piston assembly; smooth reciprocating movement; boosts engine power output reduces leakage cylinder sleeve with wear piston ring set; solid piston pin complete sealing gaskets; to temperature long time friction loss OEM standardized overall dimension sealing structure; all supporting gaskets included in package; tight fit to eliminate oil leakage after assembly