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2-57 2 Servicing Components (660 cc/1100 cc Z1) NOTE: Critical engine specifications are located Thoroughly clean all non-electrical components in parts-cleaning solvent; then remove any carbon buildup from the cylinder head and piston dome. Visually inspect all engine components for wear or damage. NOTE: Whenever a part is worn excessively, PISTON ASSEMBLY NOTE: Oversized pistons are available allowing NOTE: Whenever a piston, rings, or pins are out Cleaning/Inspecting Piston 1. Using a non-metallic carbon removal tool, remove any carbon buildup from the dome of the piston. 2. Inspect the piston for cracks in the piston pin, dome, and skirt areas. 3. Inspect the piston for seizure marks or scuffing. NOTE: If seizure marks or scuffing is detected, 4. Inspect the perimeter of each piston for signs of excessive “blowby.” Excessive “blowby” indi- cates worn piston rings or an out-of-round cylin- der. Removing Piston Rings 1. Starting with the top ring, slide one end of the ring out of the ring-groove. 2. Remove each ring by working it toward the dome of the piston while rotating it out of the groove. NOTE: If the existing rings will not be replaced Cleaning/Inspecting Piston Rings Using a ring-groove cleaning tool, clean carbon from the ring-grooves. Be sure to position the ring with its tapered side up. Measuring Piston-Ring End Gap (Installed) 1. Place each piston ring in the wear portion of the cylinder. Use the piston to position each ring squarely in the cylinder. NOTE: Remove any carbon; then clean the top of 2. Using a feeler gauge, measure each piston-ring end gap. Acceptable ring end gap must be within specifications. 0738-531 Piston Ring/Groove Clearance NOTE: Before checking, piston grooves must be Fit new piston ring into piston groove and measure clearance between ring and ringland by using feeler gauge. Measurement must be within specifications. If clearance is out of specification, replace piston. ! CAUTION Water or parts-cleaning solvent must be used in ! CAUTION Improper cleaning of the ring-grooves by the use of |