Dyna's are easy to fill. Pull the nozzle out to just above the VRS and slowly pull the trigger to finish filling up.I put enough in to just cover the low side of the VRS. I'm pretty sure you are'nt supposed to fill any further according to the owners manual. My sporties on the other hand were a bloody nightmare to fill up. I gave myself a pat on the back if I managed to fill up without spilling fuel on the paintwork.