Honda CB125 CB160 (1972) [44/139] Caution

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38 3 ENGINE I Inspection 1 When the piston ring has been removed it should be fitted with the gap approximately 15 mm 6 from skirt of the cylinder at a right angle to the center line Measurement of the gap should be made with a thickness gauge Refer to Fig 3 105 Correction limit Standard value Top ring 0 15 to 0 35 mm 006 to 014 When over 0 8 mm LO3 J replacement should be made 2nd ring 0 15 to 0 35 mm 1 006 to 014 Same as above Oil ring 0 10 to 0 30 mm 1 0039 to 011 Same as above 2 Tension of the piston ring is measured with a ten sion measuring instrument as shown in the figure Refer to Fig 3 104 Correction limit Standard value When over 0 8 kg replace ment should be made 0 55 0 12kg 1 2 lb 3 Ibl Top ring Fig 3 104 Ring tension measurement 2nd ring 0 55 0 12kg 1 2 lb 3 lb Same os above Oil ring 0 75 0 15 kg 1 65 lb 33 lb Same as above II Replacing piston rings 1 When a piston ring is reassembled it should be fitted to the cylinder Inspection should be made to determine if the gaps p the top and second rings are between 0 and 0 30 mm 011 and of the oil 011 ring If between the gaps 0 10 0039 are somewhat to 0 30 less mm they should be dressed with a file CAUTION a When a gap is dressed with a file adjust ment should be made at a right angle due to right angle fitting b If the piston ring gap is too small seizure between the ring and cylinder occurs due to thermal expansion if the gap is too large oil penetration Fig 3 105 or gas leakage occurs Refer to

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