The radius of your tappets (cam followers) affects the timing figures. Do you know what radius they are ? The megacycle website might be of help , they have charts showing the timing figures.
You might also find your answer here
http://www.postdiluvian.org/~mason/moto/cam-timing.html
You might also find your answer here
http://www.postdiluvian.org/~mason/moto/cam-timing.html