Yamaha DRAG STAR XVS650 (1997) [77/360] Insp ad

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COMPRESSION PRESSURE MEASUREMENT INSP ADJ a Compression pressure with oil applied in the cylinder Reading Diagnosis Higherthan Worn or damaged pistons without oil Repair Possible defective ring s Same as valves cylinder head gasket without oil or piston Repair Compression pressure at sea level Standard 1 100 kPa 11 kg cm2 156 4 psi Minimum 1 000 kPa 10 kg cm2 142 2 psi Maximum 1 200 kPa 12 kg cm2 170 6 psi Measurement steps Crank the engine with the throttle wide open until the reading on the compres sion gauge stabilizes A WARNING To prevent sparking ground all spark plug leads before cranking the engine Repeat the previous steps for the other cylinders NOTE ________________________________ The difference in compression pressure between the highest and lowest cylinder compression readings should not exceed 100 kPa 1 kg cm2 1 psi 7 Install Spark plugs 18 Nm 1 8 m kg 13 ft lb Spark plug caps 3 16

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