BF135A•BF150A • CYLINDER COMPRESSION TEST 1) Move the remote control lever to the “N” (Neutral) position. 2) Remove the clip of the emergency stop switch. 3) Remove the engine cover and disconnect the fuel injector connectors of each cylinder. 4) Disconnect the ignition coil connector of each cylinder and remove the spark plugs. THROTTLE ARM THROTTLE CONTROL CABLE 5) Disconnect the throttle control cable from the throttle arm. 6) Install a compression gauge in the No. 1 plug hole. 7) Set the throttle in the full throttle position by pulling the throt- tle arm against the full throttle stopper with hand as shown. 8) Set the ignition switch in the “START” position and turn the starter motor.
Measure the cylinder compression. 9) Check the compression on all cylinders. THROTTLE ARM COMPRESSION GAUGE (Commercially available) 2-15 Cylinder compression 1,352 - 1,728 kPa (15.6 - 17.6 kgf/cm2, 222 - 250 psi) at 200 min-1 (rpm)