hi there. so i am a learner and ride a 1983 honda vt250f. (passed down through the family since new) i went to my mates house and he said the chain was a bit loose. we undid the bolts and tightened the nut on the back of the rear forks. i dont know what he did because the chain is a little loose. then half a rotation of the wheel. if i check it again its quite tight. much too tight to be ride on. and when i press the rear brake now its really firm and i have to kick the rear brake lever back up with my foot ( drum brake) anybody know how to properly adjust these chains? i cant find a thread anywhere. any help would be greatly appreciated.