3/4-1 1/4" of slack. (look in your owners manual to see what spec is)
as for your whine,
what tension do you have now ??? might be too tight.
are the marks on each side of the axle the same ?
is the axle TOO TIGHT ??
Another thing to remember is that the slack should be checked under load. I.e. with you sitting on it. It will tighten slightly when you sit on it and if you are on the tight side it will be too tight. That was the problem I had the first time I adjusted my chain. I went by what it said in the book and noticed when I sat on it I could hear the chain "creak." I backed the adjuster nuts about between 1/4 and 1/2 a turn and it was perfect.
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