How do gap set points for a 1979 Yamaha tt500?

Take your magnetto and points cover off turn the mag wheel arount until you see the points opening. The points should be just opening as the "F" mark on the mag wheel is just going past the mark on the crankcase cover. When looking at the mag wheel the direction the wheel should be going is anti clockwise as the f mark goes past the mark on the crank case. When the points are fully open which will be just past the f mark then adjust to either 0.35mm or 0-014in. Good luck 5831t12y0