Honda CB100 CL100 SL100 CB125S CD125S SL125 (1970) [21/101] Piston ring gap

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17 2 Piston diameter inspection Measure the piston at the skirt Fig 39 Standard value Item Piston diameter Serviceable limit CB100 CL100 SL100 50 47 50 49mm 1 987 1 988 in CB125S CD125S SL125 55 80mm 55 97 55 99mm 2 2035 2 2043 in 2 1968 in 50 3mm 1 980 in Replace if beyond the serviceable limit 3 Measure the piston ring side clearance using a thickness gauge Replace the piston ring or piston if beyond the serviceable limit Item Standard value Serviceable limit Piston ring side clearance O O25 O O3Omm 0 0008 0 0011 in 0 7mm 0 0275 in Fig 39 Piston diameter measurement J Piston Micrometer 4 Piston ring gap Insert the piston ring into the cylinder so that it is normal to the cylinder axis and then measure the ring gap using a thickness gauge Fig 40 Top and second rings 0 15 0 35mm 0 0059 0 0138 in Serviceable limit 0 5mm max 0 0197 in Oil ring 0 15 0 04mm 0 0059 0 0158 in 0 5mm max 0 0197 in Item Standard value Replace if beyond the serviceable limit C Reassembly 1 Assemble the piston ring on the piston Note The ring marking located adjacent to the ring gap should be toward the top Fig 41 When installing new piston rings roll the rings over their respective piston ring grooves to make sure that the ring side clearances are adequate Rings should roll smoothly 2 Install the piston Fig 42 Note Install the piston so that the IN marking on the piston head is toward the rear Replace all piston pin clips with new items 3 Space the piston ring gaps equally apart 120 and then install the cylinder Note Do not forget to install the two dowel pins in the mounting base Fig 41 Piston ring marking Fig 42 Piston installation Piston pin clips 2 Long nose pliers

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