Re: tight chain
1/2 to 3/4" slack is ideal. Any more or less and you could have problems. Measure the slack by leaving the clutch engaged and rolling the bike forward. The upper portion of the chain will go slack. Measure at the center of the chain span between sprockets.
Hope this answers your question.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"