If the Honda has the original points, there is plenty of metal there to sand. if there wasn't, I would have to replace the points in everything I own. A '74 Z50 would most likely have been manufactured in 1973. Usually the foot of the points that rides on the little cam will wear out before the contacts. I've only done this a few hundred times though. I have 2 ATC70s with sanded points, a ct70 with sanded points a Z50, suzuki TS125, Several Tecumsehs, Briggs,and Kohlers all with sanded points, and all run well:thumbsup: By sanding, I don't mean actually removing metal, just oxidation and minor surface corrosion.