Honda CB125 CB160 (1972) [45/139] Refer to fig 3 107

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3 9 CAM CHAIN TIGHTENER AND CAM CHAIN GUIDE ROLLER 2 When piston ring is set on the piston any catch between the ring and the groove may prevent smooth operation It is necessary to inspect the status when the ring is fitted to the groove by rotating the ring around the circumference Refer to Fig 3 106 3 When the piston ring is assembled attention should be directed so that the upper and lower surface Fig 3 106 Inspecting piston ring by rotating around the ring groove of the ring are proper The manufacturer s mark is usually stamped on the ring Refer to Fig 3 107 If assembly is performed with the upper and lower surfaces improper oil may be sucked up 4 When the piston rings is being installed employ ment of a piston ring tool helps obtain proper and simple operation Refer to Section 3 8 Cl 3 9 Cam chain tightener and cam chain guide roller Fig 3 107 Confirming upper and lower surface of the piston ring A Operation of cam chain tightener The cam chain tightener is used to tighten the cam chain from the outer side with the cam chain guide roller in between As shown in the figure the tightener push bar is automatically pushed out by the cam chain tightener spring and supports one end of the tightener which performs a see saw potion with the cam chain guide roller pin as a supporting point On the other hand the tightener roller is pressing the cam chain When the tightener set bolt is loosened Fig 3 108 Cam chain tightener the tightener push bar automatically stretches the cam chain by tension of the spring Refer to Fig 3 108 I Disassembly 1 Separate the cylinder head and cylinder 2 Apply a thin wire guide to the cam chain 3 Remove the two 6X18 bolts mounting the cam chain guide roller and separate the cam chain tightener from the crankcase Refer to Fig 3 109 Fig 3 109 Removing cam chain tightener 39

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