Honda CB125 CB160 (1972) [43/139] Caution

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3 8 CRANKSHAFT CONNECTING RODS AND PISTONS 4 Measurement of piston pin hole Refer to Fig 3 99 Correction limit Standard value When above mm replace ment shoud be made Bore 5 For oversize pistons there are three at intervals of 0 25 mm 6 Measurement of the piston outside diameter Fig 3 99 Measuring piston pin hole Correction limit Standard value Outside diameter CB 125 160 III Assembly 1 At installation the arrow mark at the piston head should be faced in the forward direction Refer to Fig 3 100 CAUTION Care should be taken since reversal of direction causes the piston head to contact the valves 2 For fitting of the piston pin piston and piston end of the connecting rod a normal temperature float system is employed Hence fitting should be such that light manual pressure at normal tem perature is sufficient for insertion Refer to Fig 101 3 Avoid the use of piston rings which have lost their temper use new piston rings D Description of piston rings Of the steel rings hard chrome plating is applied to the top and second and parkerizing is applied to the oil ring The top and second rings are compression rings and the oil ring is for scraping down oil on the cylinder wall All transmit piston heat to the cylinder wall 1 As the top ring is especially apt to wear due to high temperature hard chrome plating is applied for increasing wear resistance 2 At the second ring the contact surface with the cylinder is reduced for increasing the tension per unit area smooth fitting is obtained in a short period 3 The oil ring has an indented shape suitable for scraping oil down Fig 3 102 Sectional vieto of piston rings 37

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