I've got my b-in-laws sled in my garage waiting for a piston to arrive. He says that when he has the flipper on the bar the tach reads 9500. It's a 99 with 38mm flat slides. Will this thing respond to heavier weights? He can get his speedo to read 100 mph. Of course I can smoke him with my 600 twin but It would be OK to be a little more even.