The chain is size 530, and the stock gearing is 15/45, meaning that the front sprocket has 15 teeth and the rear sprocket has 45 teeth.
45 tooth rear
I think 17/42 is stock
14t on front. 40t on back
13 theeth...upgrade to 14's niceee
16 teeth in the front 45 teeth in the rear
They came stock with a 49T or 48T rear sprocket you can choose a replacement with either a 48T, 49T, 50T, or 51T, if you have the old sprocket count the teeth on the sprocket and that tells if it is a 48T, 49T or whatever (48T = 48 teeth)
I have a "Clymer Honda CB 750 Nighthawk 1991-1993 & 1995-1999" book. It says for sprocket sizes, "Drive Sprocket 15 teeth, Driven Sprocket 38 teeth". Nothing else listed in there or in the Owner's Manual as to size.
depends if the sprocket is bigger or smaller than a stock sprocket.
it is , if you are minimum 135cm
15-36 is the best
13t driver goes on a 33t sprocket