Honda CB125 CB160 (1972) [122/139] Caution

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116 6 INSPECTION AND MAINTENANCE CAUTION Adjust the tappets when the engine is cold A thickness gauge of 0 03 mm 1 0012 mm should pass while that of 0 05 mm 1 00195 cannot When the adjusting nut is tightened the clearance will change slightly Hold the adjusting screw with the special clearance adjusting tool while tightening the nut 3 Ignition Timing Even though compression and valve timing are satis factory if the spark timing is not correct the engine will not operate smoothly If the timing is too bad overheating or backfire may result both of which are detrimental to the condition of the engine Tools required for adjusting the spark timing Refer to Fig 6 10 a Remove the distributor point cover Fig 6 10 Tools required for adjusting the spark timing b Remove the generator cover and check clearance c Check the points for pitting burning or protru sions If necessary remove and correct by honing with an oilstone d Rotate the crankshaft and align the highest part of the point cam with the breaker arm sleeve NOTE There are two cams on the distributor point shaft Either cam may be used e To adjust point clearance loosen the two breaker arm retaining screws and adjust b with a screwdriver When lb is turned to the right the clearance decreases Refer to Fig 6 12 f Standard clearance is from 0 05 1 00195 mm to 0 35 0136 mm g When the mark on the generator is aligned with the mark on the stator the contact points should open This is the correct timing adjust ment

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