I find it hard to believe that this bike 91 dr 350 has only 27 hp. Also the reviews are claiming a top speed of 78-mph.My bike I believe is all stock. It has very little mid-range and a lot on top. I am getting close to90-mph.I have a terrible mid range. Also I have a 47 tooth rear sprocket. I intend to switch to a 52. hoppfully this will give me the low end excitment i need. If any of you out there have any suggsetions i would like to hear them.look forward to hearing from you best regards.