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Left hand thread you already know....KEEP that in thought when making the second tightening......(no not me i never went the wrong way and had to start over....)
Out of my 2000 book
INITAL tighten with torque wrench is 50 ft. lbs. THEN
You scribe a line thru the center of bolt and out on the sprocket (i use soapstone)
using straight line,,, tighten MORE 30* deg. off line minimum and 45* deg off line is maximum..... no looser or it can work loose says my 2000 big HD book......
I don't know the final torque number would be but I would bet 70/75 ' lbs... I would use their suggested above way....
signed....BUBBIE