Honda CB125 CB160 (1972) [41/139] Refer to fig 3 1

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35 3 8 CRANKSHAFT CONNECTING RODS AND PISTONS Inspection 1 Measurement of deflection at the piston end of the connecting rod Refer to Fig 3 91 Correction limit Standard value When over 3 0 mm replace ment should be made Deflection 2 Measurement to determine if the connecting rod ends are correctly aligned and parallel is obtained by measuring the difference of inclination of points 50 mm 2 0 away from the center when a 100 mm 14 0 bar with the same thickness as the Fig 3 91 Measurement of maximum deflection at the piston end of connecting rod MAXDEFLECTION piston pin diameter is inserted into the bore of the piston end and twisted to the right and left and when the bar is rotated 90 and again twisted to the right and left Refer to Fig 3 92 Standard value Correction limit Level of parallel Less than than 0 02 mm 0006 i When over 0 1 mm 04 1 replacement should be made Twist Less than 0 02 mm i 0006 When over 0 1 mm replace ment should be made A B DEGREE OF PARALLFLISM Fig 3 92 Measurement of parallel condition at the piston end of the connecting rod C Description of pistons The piston is an oval type which is heat treated and worked after casting with aluminium alloy The piston under high temperature swells in the pin direc tion and clearance with the cylinder is decreased When the piston and cylinder are fitted close atten tion should be paid to the clearance In addition in the CB 125 and 160 for increasing the compres sion ratio the piston head is cut for avoiding inter ference between the valve and piston Refer to Fig 3 93 V When clearance between the piston and cylinder is too large 1 When the piston reverses direction at the top and bottom dead centers shock is intense and a slapping noise results 2 Oil penetration to the combustion chamber occurs V When the clearance is too small 1 Formation of oil film inside the cylinder does not occur and seizure results 2 Even when seizure does not occur the output is decreased since friction loss is increased Fig 3 94 Measuring clearance between piston and cylinder

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