6. ENGINE REMOVAL ATV 300/250 ENGINE REMOVAL Drain engine oil and transmission oil. (Refer to chapter 3) Remove frame covers and exhaust pipe. (Refer chapter 2) Remove the carburetor. (Refer to chapter 5) Disconnect the crankcase breather hose at the cylinder head cover. Crankcase Breather Hose Water Hose Disconnect the water hose from water pump cover. Thermostat Bolt Remove the bolt at the thermostat and disconnect the thermosensor wire, then disconnect the thermostat from the cylinder head. Thermosensor Wire Drive Select Arm Remove the bolt at the drive select arm, then disconnect the drive select arm from engine assembly. Bolt 6-2