6. ENGINE REMOVAL/INSTALLATION ATV 150/125 Disconnect the spark plug high-tension wire. Remove the spark plug cap and disconnect the ignition coil wire from the set plate. Ignition Coil Wire Drive Chain Gear Remove the rear drive chain gear on the bolts. Remove the drive chain gear. Bolts Remove the pair control solenoid valve from the frame. Pair Control Solenoid Valve 6-3