In my opinion - the last of the NF5's were at the pinnacle of engineering for that model. Apart from a change of ignition rotor from 1990 - the bottom end of the NF5's remained pretty much unchanged throughout the model range. It was continuing research and improvement on the cylinders, reeds and exhausts and particularly, the adaption of USD front forks that really brought the 1992 NF5 to the top of it's game.

Yamaha pipped Honda with it's 1991 TZ250B model as the first V-twin and first with USD forks. Kind of made the stock 1991 RS250 look a bit dated so Honda made changes to the 92 RS250 to follow suit, before taking a complete fresh approach with the significant engineering changes to the new and improved 1993 RS250. Virtually nothing could be interchanged between the models so the new RS250's advanced ahead.

Just a shame Honda didn't make enough spares to keep us all happy with our NF5 model range