Honda CB125 CB160 (1972) [121/139] Caution

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115 6 1 MAINTENANCE CAUTION 1 If the throttle and choke are not wide open the amount of pressure registered on the gauge will be small and not representative 21 The registered pressure will increase with every kick of the starter The pedal should be kicked until the compression gauge registers a maximum reading 13 Make sure that the engine is warm when gauging the compression otherwise the indicated pressure will not be true compression e The compression pressure should be from 128 Fig 6 5 Correct compression pressure to 149 psi 9 0 to 10 5 kg sq cm Refer to Fig 6 5 f When the pressure is more than the above carbon accumulates in the combustion chamber and on the piston face The cylinder head should be removed piston and cylinder assembled and the carbon removed g When the pressure is less than the above either the piston rings are not making a good seal or the head gasket is defective Piston rings and head gasket should be inspected and Fig 6 6 Troolsequired for tappet clearance adjustment the tappets should be adjusted or disassembled 2 Tappet Adjustment Tappet clearance is affected by the open and close period of the valve closure is insufficient the tappet will be raised when there is no compression If the clearance is excessive the tappet will knock Tappet clearance affects engine power performance at slow speeds and silence of engine operation a Remove the four cylinder head caps b Remove the generator cover c When the mark of the stator and the generator rotor are aligned tappet clearance should be Fig 6 7 Alignment of the stator adjusted at compression top dead center d Rotate the crankshaft through 360 deg and adjust the clearance of the opposite tappet e Standard tappet clearance should be from 0 03 to 0 05 mm Fig 6 8 Tightening the adjusting nut

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