given all the variables of the differences through the years. thats just what it tuned in at from the factory, governed to run 25mph....chart is a base where to start on a unmolested 1.5mph tuned puch bike of the model yr......change the differences, it will need different tuning. puch constantly strived for better durability, reliability, performance. hence the multitude of parts/numbers for e50, and the need for a chart to keep everything straight for the mechanic. i would trust the chart.....my 2 cents...