Honda CB350 CL350 [38/219] Cam case and cylinder head

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3 2 CAM CASE AND CYLINDER HEAD Q Cylinder Reassembly 1 Check to make sure that the cylinder gasket and the two locating pins on the crankcase are installed in place also check to make sure that the O ring and cam chain guide are installed on the cylinder skirt 2 Assemble the cylinder by using a piston ring compressor Fig 3 45 3 Assemble the cylinder head in the sequence of 3 2 D D Cylinder Piston 3 Piston ring compressor Fig 3 45 Installing the cylinder NOTE When installing the cylinder check to make sure that the piston ring gaps are spaced equally a part This is to prevent gas blow by R Piston Description The piston is made from selected aluminum alloy casting material SAE 332 This material is light and strong making it suitable for high speed In addition it possess good heat conducting property to rapidly dissipate heat Furthermore the coefficient of heat expansion is small thus minimizing the warpage at elevated temperature and permitting a small piston to cylinder clearance design The piston compared to the skirt is exposed to higher temperature and since the expansion is greater it is tapered smaller toward the top The tapering of the piston also tends to lessen the piston slap when the throttle is lightly snapped without load on the engine Fig 3 46 The piston employs a four step taper further the piston pin boss area is made thicker resulting in greater expansion at high temperature For this reason the diameter of the piston skirt is made smaller in the direction of the piston pin so that at the high operating temperature the piston will expand into a true circular shape The skirt is constantly provided with1 flexibility to assure that no deformation will resufeeven from extended continuous driving s The piston pin is offset 1mm 0 04 in from the piston centerline in the direction of the inlet valve so that when the piston approaches the top dead center of the compression stroke the side load from the cylinder moves from the right side to the left With a O offset the point will move to align with the top dead center of

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