It takes about 3 hours to do this; having a helper for the actual lowering process helps a lot:
- Remove fairing, sidecovers and fuel tank.
- Remove exhaust headers (canisters can stay in place).
- Remove carburettors.
- Disconnect shifter; remove countershaft cover and sprocket.
- Unbolt radiator; radiator can be left attached by hoses.
- Temporarily pull the top main hose going to the radiator filler neck, and reroute it below the frame (you'll lose a few ounces of coolant); reattach. Pull the small overflow hose. Unbolt the thermostat from the frame.
- Remove the front engine mounting bolt, and two front mounting "wings," along with their coils/wires.
- Disconnect remaining wiring: two connectors at rear of engine, starter, battery ground, temperature sending, oil pressure, radiator fan and neutral position wires.
- Support motor with a floor jack under the oil filter; remove 2 rear motor mount nuts/bolts.
- Lower it slowly and see if anything else is attached.
Note: If you are removing the engine to rebuild it, it makes more sense to drain the coolant and oil before pulling it. The steps above to avoid draining the coolant are assuming a basic engine swap procedure.