Honda CB125 CB160 (1972) [42/139] Caution

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36 3 ENGINE I Disassembly 1 Remove the piston pin retainer from the removed crankshaft and remove the piston pin Refer to 3 95 2 When the piston pin is removed attention should be directed so that the ring is not twisted Em ployment of the piston ring tool is recommended Refer to Tig 3 96 II Inspection 1 Before cleaning carbon adhering to the piston head or sing groove should be removed with out the piston being scarred CAUTION Sandpaper should not be used for removing HEAD DIAMETER 2 Measurement of outside diameter of the piston Refer to Fig 3 97 Standard value Head diameter Maximum diameter Correction limit mm mm Dmm Dmm Fig 3 97 Measuring pislon outside diameter ICB 125 160 3 Measurement of the ring groove clearance when a new piston ring is fitted Refer to Fig 3 98 Standard value Top ring 0 04 to 0 07 mm 0016 to 0028 1 Correction limit When over 0 15 mm 1 0060 replacement should be made 2nd ring 0 01 to 0 04 mm 0004 to 0016 1 Same as above Oïl ring 0 01 to 0 04 mm 0004 to 0016 1 Sarne os above Fig 3 98 Measuring ring groove when a new piston ring is fitted CB 125 160

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