CC127D ATV-1068A 2. Wash the cylinder in parts-cleaning solvent. Measuring Camshaft Runout 3. Inspect the cylinder for pitting, scoring, scuffing, and corrosion. If marks are found, repair the sur- NOTE: If the camshaft is out of tolerance, it must face using a ball hone. be replaced. NOTE: To produce the proper 60° cross-hatch 1. Place the camshaft on a set of V blocks; then posi- pattern, use a low RPM drill (600 RPM) at the rate tion the dial indicator contact point against the of 30 strokes per minute. If honing oil is not avail- able, use a lightweight petroleum-based oil. Thor- shaft and zero the indicator. 3 oughly clean cylinder after honing using soap and hot water. Dry with compressed air; then immedi- ately apply oil to the cylinder bore. If the bore is severely damaged or gouged, replace the cylinder. CC283D 2. Rotate the camshaft and note runout; maximum tolerance must not exceed specifications. Measuring Camshaft Lobe Height CC390D 4. If any measurement exceeds the limit, bore the 1. Using a calipers, measure each cam lobe height. cylinder and install an oversized piston or replace the cylinder. NOTE: Oversized piston and rings are available. The oversized piston and rings are marked for identification. ATV1013A 2. The lobe heights must not exceed minimum speci- fications. 3-19