Honda CB125 CB160 (1972) [39/139] Refer to fig 3 84

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33 3 8 CRANKSHAFT CONNECTING RODS AND PISTONS 6 Remove the 6X35 bolt at the lower crankcase front section 7 Pull out gently and in line with the crankcase 8 Assembly is the reverse order of disassembly 3 8 Crankshaft connecting rods and pistons A Description of crankshaft The right and left crankshafts are of carbon steel and the counterweights are of nickel chrome molybde num steel Each crankshaft is constructed by press inserting the counterweight into the crankshaft The center crankshaft is press inserted and coupled The crankshaft is supported at four points one ball bearing and three roller bearings The sprocket of the cam chain is cut in the crankshaft and drives the cam shaft Refer to Fig 3 84 All bearings are secured to the crankcase by guide pins In the center crank outer ring an oil hole which Fig 3 84 Crankshaft matches the oil hole of the upper crankcase is the CONNECTING ROD guide the guide is in the form of a pipe Oil pumped by the oil pump is divided at the center crank outer ring oil hole one supply lubricates the roller bearing and the other is stored in the cuta way of the counterweight side surface for feeding from the weight cutaway groove to the interior of the crank pin by centrifugal force This lubricates the crankshaft end of the connecting rod Refer to Fig 3 85 CENTER CRANK OUTER RING Fig 3 85 Crankshaft lubricating passage I Disassembly 1 Drain oil from the crankcase 2 Separate the cylinder head and cylinder 3 Separate the left and right crankcase cover 4 Separate the AC generator and clutch oil pump 5 Hence disassembly of the crankcase is performed by following Section 3 5 E Fig 3 86 Cranlcase bolts ard nuts

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