I tried a trick I saw on the web for dampening vibrations through the handle bars by inserting a rubber hose inside the bars. I filled the hose with lead shot and plugged the ends. It seemed to help, so I added a couple of bolt on lead weights to the cross bar on the handle bars, which did help on the vibration issue. I think I'm going to remove the hoses and just fill the handlebars with some lead shot. I went for a speed test using a TomTom and got a solid 45 mph. I thought that wasn't bad for a 160 lb machine and 240 lbs of me with a stock motor.