Re: clutch info...
When you disengage the clutch (squeeze the handlebar lever) the engine is disconncted from the rear wheel. That is assuming the clutch cable is adjusted correctly.
There will always be a little parasitic drag when pedaling with the clutch disengaged but you can pedal normally. Pedaling while the engine is running and clutch enagaged sould be almost effortless. Some call it 'ghost pedaling' to give the illusion that you are moving under pedal power to the casual observer.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"