Honda CB350 CL350 [40/219] Cam case and cylinder head

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3 2 CAM CASE AND CYLINDER HEAD PISTON RING FLUTTER At low speed the piston ring is forced against the upper side of the ring groove only during the intake stroke At high speed however the inertia of the ring overcomes the gas pressure and friction and floats to the top of the groove immediately before the top dead center in the compression stroke At this mement combustion occurs and the ring is forced against the bottom side of the ring groove by the combustion pressure This up and down movement during exhaust intake compression becomes more and more intense coupled with the increasing inertial force As this sequence is repeated ultimately the ring vibrates violently within the ring groove like a pingpong ball between the racket and the table as shown in the Fig 3 51 and thus allow the gas to blow by Fig 3 50 51 Î Piston 2 Piston ring Fig 3 51 Piston ring flutter T Piston and Piston RingDisassembly a 1 Remove the piston pjp clip and push c ut the piston pin Drsass mHe rom x necting rod 4 Ar f NOTE When removing the piston pin clip care should be exercised so that the clip is not dropped into the crankcase Fig 3 52 2 Remove the piston rings from the piston If no topi is available the rings may also be removed with hand by separating ring at the opening with both hands The ring should not be twisted as it will break U Piston and Piston Ring Inspection 1 Before inspection carbon adhering to the piston head or ring groove should be removed using care not to scratch piston NOTE Emery paper should not be used for removing the carbon use a carbon scraper D Piston pin clip Pliers Fig 3 52 Removing the piston pin clip 29

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