Honda CB125 CB160 (1972) [25/139] Caution

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19 3 2 CYLINDER HEAD AND CYLINDER CAUTION a the valve stem is greatly worn the valve guide is usually also worn Hence when a valve is replaced it also is desirable to replace the CB 125 160 Valve Timing models When valve guide As the guide was 5 B T D C IN opens at 1 1 mm lift In closes I 30 A B D C l EX opens I 30 B B D C EX closes I 5 A T D C l press inserted it is better to replace the guide after heating the head to 300 C in a furnace b When the valve is assembled the compound which was used during lapping should be com pletely removed F Description of cylinder A cylinder sleeve of special alloy is press inserted in a cylinder of lightweight cast aluminium alloy At the center of the cylinder a clearance for the opera tional range of the cam chain tightener and cam chain is established The lubrication oil fed from the oil pump passes through the stud holes at the rear right and left of the cylinder head at the gasket surface Fitting of cylinder is determined by two guide keys Refer to Ftg 3 37 Cylinder Fig 3 37 Disassembly 1 Remove the cylinder as in Section 3 2 1 and the 6 X 22 bolt retaining the cylinder the cylinder can be removed from the stud bolt Refer to Fig 3 38 II Assembly 1 Inspect the cylinder and after confirmation of no Fig 3 38 Inspection cylinder abnomality such as ground wear or scars remount 2 it Place packing at the contact surface with the crankcase and insert the cylinder 3 When a piston is inserted into a cylinder use a piston slider Applying a base between the piston and case insert the cylinder Refer to Fig 3 39 4 Assemble the cylinder head and head cover unit CAUTION Inspect to determine if the crankcase packing has slipped from the cylinder lapping surface For air tighteness Fig 3 39 Coupling piston to cylinder

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