The manual shows the process for adjusting the clutch cable to increase or decrease the speed. It's right where the cable comes out of the handle. It also says it will break in a little when it's new so you may experience some inconsistencies at first. Mine is new and it is pretty quick. I've just got it on a really low setting for now and it is fine. I will give it probably around 10 hours of run time before I start adjusting the cable if I need to.