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2-130 4. Place the cylinder heads on a Surface Plate (p/n 0644-016) covered with #400 grit wet-or-dry sandpaper. Using light pressure, move each cylin- der head in a figure eight motion. Inspect the seal- ing surface for any indication of high spots. A high spot can be noted by a bright metallic finish. Cor- rect any high spots before assembly by continuing to move the cylinder head in a figure eight motion until a uniform bright metallic finish is attained. CM018 CYLINDERS 1. Using a non-metallic carbon removal tool, remove carbon buildup from the exhaust ports. 2. Wash the cylinders in parts-cleaning solvent. 3. Inspect the cylinders for pitting, scoring, scuffing, and corrosion. If marks are found, repair the sur- face with an appropriate ball hone and honing oil (see chart). NOTE: To produce the proper 60° crosshatch pat- 4. Place the head surface of each cylinder on the sur- face plate covered with #400 grit wet-or-dry sand- paper. Using light pressure, move each cylinder in a figure eight motion. Inspect the surface for any indication of high spots. A high spot can be noted by a bright metallic finish. Correct any high spots before assembly by continuing to move the cylin- der in a figure eight motion until a uniform bright metallic finish is attained. PISTON ASSEMBLY 1. Using a non-metallic carbon removal tool, remove the carbon buildup from the dome of each piston. 2. Take an old piston ring and snap it into two pieces; then grind the end of the old ring to a 45° angle and to a sharp edge. Using the sharpened ring as a tool, clean carbon from the ring-grooves. Be sure to position the ring with its tapered side up. 3. Inspect each piston for cracks in the piston pin and skirt areas. 4. Inspect each piston for seizure marks or scuffing. Repair with #400 grit wet-or-dry sandpaper and water or honing oil. AN135 NOTE: If scuffing or seizure marks are too deep 5. Inspect the perimeter of each piston for signs of excessive “blowby.” Excessive “blowby” indicates worn piston rings or an out-of-round cylinder. ! CAUTION Water or parts-cleaning solvent must be used in BALL HONES Engine Size p/n 500 cc 0644-291 600 cc 0644-292 ! CAUTION Water or parts-cleaning solvent must be used in ! CAUTION Improper cleaning of the ring-grooves by the use of |