2. GENERAL INFORMATION VITALITY 50 SERVICE INFORMATION (4-STROKE) ENGINE Standard (mm) Service Limit (mm) Item VITALITY 50 (4-Stroke) Cylinder head warpage 0.10 Piston O.D.(4.55mm from bottom of piston skirt) 38.97538.99 38.90 Cylinder-to- piston clearance 0.0100.040 0.10 Piston pin hole I.D. 13.00213.008 13.04 Piston pin O.D. 12.99413.0 12.96 Piston-to-piston pin clearance 0.0020.014 0.02 Ring-to-groove (top/second) 0.150.55 0.09 Connecting rod small end I.D. 13.01613.034 13.06 Cylinder bore 39.039.01 39.1 Drive belt width 18 17 Drive pulley collar O.D. 19.9619.974 19.94 Movable drive face ID. 20.01120.052 20.6 Weight roller O.D. 15.9216.08 15.4 Clutch outer I.D. 107107.2 107.5 Driven face spring free length 95 90 Driven face O.D. 33.96533.985 33.94 Movable driven face I.D. 34.00034.025 34.06 Connecting rod small end free play 0.050.4 0.6 Connecting rod big end radial clearance 00.008 0.05 Run out 0.10 CARBURETOR Standard Setting mark CVK104A Type CVK 18 Float level 20.5 Main jet #82 (speed limited: #80) Slow jet #35 Pilot screw opening 21/2 Idle speed 1800100rpm Throttle grip free play 26mm 2-8