I am having trouble removing my crank rotor , any tips would be helpful

If its anything like the SR500 it will be TIGHT, with a very capital T. You need the correct puller (i think its the 20mmx1mm thread) and make sure you get the puller screwed right in. Then an air impact driver on the center nut to remove the flywheel. Over the years I've come across this problem so many times I bought my own compressor and impact driver.