Description Model/Year Cyl. Bore Size Sleeve Description Thickness O.D. Sleeve Length Type Brand Part No. 250 hp 1993 6 3.544"(90mm) straight sleeve with ports N/A 3.903" 6.350" RS Advanced 1080SA Cylinder Sleeve: Yamaha 250 Hp 76 Degree 1993 Straight Yamaha 6 Cyl 3.544 Bore 76 Degree 250 1993