4. Disconnect: spark plug cap 5. Remove: spark plug _ Before removing a spark plug, use com- pressed air to blow away any dirt accumu- lated in the spark plug well to prevent it from falling into the cylinder. CAUTION: 2 6. Attach: extension 1 compression gauge 2 1 Compression gauge 90890-03081 Engine compression tester YU-33223 Extension 90890-04082 7. Measure: compression pressure Out of specification Refer to steps (c) and (d). Compression pressure (at sea level) Minimum 392 kPa (3.92 kg/cm 2 , 55.8 psi) Standard 450 kPa (4.50 kg/cm 2 , 64.0 psi) Maximum 504 kPa (5.04 kg/cm 2 , 71.7 psi) MMM M M MMM M M MMM M M MMM M M MMM M M MMM M MMM a. Set the main switch to “ON”.
3 - 31 MEASURING THE COMPRESSION PRESSURE CHK ADJ